mirror of
https://fastgit.cc/github.com/ylytdeng/wechat-decrypt
synced 2026-04-21 13:21:30 +08:00
944546beb1
Windows 中文环境默认编码为 GBK，未指定 encoding 会导致 config.json/all_keys.json 解析失败。修复 9 个文件共 17 处。 Closes #32 Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
411 lines
14 KiB
Python
411 lines
14 KiB
Python
"""从微信进程内存中提取图片 AES 密钥 (V2 .dat 格式)
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V2 .dat 文件结构:
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[6B signature: 07 08 V2 08 07] [4B aes_size LE] [4B xor_size LE] [1B padding]
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[aes_size bytes AES-ECB encrypted] [raw_data unencrypted] [xor_size bytes XOR encrypted]
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AES key: 16-byte ASCII string found in Weixin.exe process memory
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XOR key: single byte, same as old format (derived from JPEG FF D9 ending)
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Usage:
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1. 打开微信, 进入聊天/朋友圈, 点击查看 2-3 张图片
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2. 立即运行: python find_image_key.py
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"""
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import os
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import sys
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import re
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import struct
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import glob
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import json
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import time
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import ctypes
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from ctypes import wintypes
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from Crypto.Cipher import AES
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from Crypto.Util import Padding
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# Windows API constants
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PROCESS_ALL_ACCESS = 0x1F0FFF
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PROCESS_VM_READ = 0x0010
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PROCESS_QUERY_INFORMATION = 0x0400
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MEM_COMMIT = 0x1000
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PAGE_NOACCESS = 0x01
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PAGE_GUARD = 0x100
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PAGE_READWRITE = 0x04
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PAGE_WRITECOPY = 0x08
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PAGE_EXECUTE_READWRITE = 0x40
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PAGE_EXECUTE_WRITECOPY = 0x80
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class MEMORY_BASIC_INFORMATION(ctypes.Structure):
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_fields_ = [
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("BaseAddress", ctypes.c_void_p),
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("AllocationBase", ctypes.c_void_p),
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("AllocationProtect", wintypes.DWORD),
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("RegionSize", ctypes.c_size_t),
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("State", wintypes.DWORD),
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("Protect", wintypes.DWORD),
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("Type", wintypes.DWORD),
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]
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kernel32 = ctypes.windll.kernel32
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# 正则: 精确 32 字符 alphanum (前后是非 alphanum 或边界)
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RE_KEY32 = re.compile(rb'(?<![a-zA-Z0-9])[a-zA-Z0-9]{32}(?![a-zA-Z0-9])')
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# 正则: 精确 16 字符 alphanum
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RE_KEY16 = re.compile(rb'(?<![a-zA-Z0-9])[a-zA-Z0-9]{16}(?![a-zA-Z0-9])')
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def get_wechat_pids():
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import subprocess
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result = subprocess.run(
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['tasklist.exe', '/FI', 'IMAGENAME eq Weixin.exe', '/FO', 'CSV', '/NH'],
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capture_output=True, text=True
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)
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pids = []
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for line in result.stdout.strip().split('\n'):
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if 'Weixin.exe' in line:
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parts = line.strip('"').split('","')
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if len(parts) >= 2:
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pids.append(int(parts[1]))
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return pids
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def find_v2_ciphertext(attach_dir):
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"""从多个 V2 .dat 文件中提取第一个 AES 密文块 (16 bytes)"""
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v2_magic = b'\x07\x08V2\x08\x07'
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# Search _t.dat (thumbnails, likely JPEG)
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pattern = os.path.join(attach_dir, "*", "*", "Img", "*_t.dat")
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dat_files = sorted(glob.glob(pattern), key=os.path.getmtime, reverse=True)
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for f in dat_files[:100]:
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try:
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with open(f, 'rb') as fp:
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header = fp.read(31)
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if header[:6] == v2_magic and len(header) >= 31:
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return header[15:31], os.path.basename(f)
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except:
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continue
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return None, None
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def find_xor_key(attach_dir):
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"""从缩略图文件末尾推导 XOR key (JPEG 结尾 FF D9)"""
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v2_magic = b'\x07\x08V2\x08\x07'
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pattern = os.path.join(attach_dir, "*", "*", "Img", "*_t.dat")
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dat_files = sorted(glob.glob(pattern), key=os.path.getmtime, reverse=True)
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tail_counts = {}
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for f in dat_files[:32]:
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try:
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sz = os.path.getsize(f)
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with open(f, 'rb') as fp:
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head = fp.read(6)
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fp.seek(sz - 2)
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tail = fp.read(2)
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if head == v2_magic and len(tail) == 2:
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key = (tail[0], tail[1])
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tail_counts[key] = tail_counts.get(key, 0) + 1
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except:
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continue
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if not tail_counts:
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return None
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most_common = max(tail_counts, key=tail_counts.get)
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x, y = most_common
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xor_key = x ^ 0xFF
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check = y ^ 0xD9
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if xor_key == check:
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return xor_key
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return xor_key # return best guess anyway
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def try_key(key_bytes, ciphertext):
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"""Try decrypting ciphertext with key, return format name if successful"""
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try:
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cipher = AES.new(key_bytes, AES.MODE_ECB)
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dec = cipher.decrypt(ciphertext)
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if dec[:3] == b'\xFF\xD8\xFF':
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return 'JPEG'
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if dec[:4] == bytes([0x89, 0x50, 0x4E, 0x47]):
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return 'PNG'
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if dec[:4] == b'RIFF':
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return 'WEBP'
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if dec[:4] == b'wxgf':
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return 'WXGF'
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if dec[:3] == b'GIF':
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return 'GIF'
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except:
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pass
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return None
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def is_rw_protect(protect):
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"""Check if memory region is readable/writable (where string keys live)"""
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rw_flags = (PAGE_READWRITE | PAGE_WRITECOPY |
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PAGE_EXECUTE_READWRITE | PAGE_EXECUTE_WRITECOPY)
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return (protect & rw_flags) != 0
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def scan_memory_for_aes_key(pid, ciphertext):
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"""扫描微信进程内存寻找 AES key (regex 加速版)"""
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access = PROCESS_VM_READ | PROCESS_QUERY_INFORMATION
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h_process = kernel32.OpenProcess(access, False, pid)
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if not h_process:
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print(f" 无法打开进程 {pid} (尝试以管理员运行)", flush=True)
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return None
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try:
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# Enumerate memory regions
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address = 0
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mbi = MEMORY_BASIC_INFORMATION()
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rw_regions = []
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all_regions = []
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while address < 0x7FFFFFFFFFFF:
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result = kernel32.VirtualQueryEx(
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h_process, ctypes.c_void_p(address),
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ctypes.byref(mbi), ctypes.sizeof(mbi)
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)
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if result == 0:
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break
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if (mbi.State == MEM_COMMIT and
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mbi.Protect != PAGE_NOACCESS and
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(mbi.Protect & PAGE_GUARD) == 0 and
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mbi.RegionSize <= 50 * 1024 * 1024):
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region = (mbi.BaseAddress, mbi.RegionSize, mbi.Protect)
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all_regions.append(region)
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if is_rw_protect(mbi.Protect):
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rw_regions.append(region)
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next_addr = address + mbi.RegionSize
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if next_addr <= address:
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break
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address = next_addr
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rw_mb = sum(r[1] for r in rw_regions) / 1024 / 1024
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all_mb = sum(r[1] for r in all_regions) / 1024 / 1024
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print(f" RW 区域: {len(rw_regions)} ({rw_mb:.0f} MB), 总计: {len(all_regions)} ({all_mb:.0f} MB)", flush=True)
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# Phase 1: 只扫描 RW 区域 (key 字符串最可能在这里)
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print(" === Phase 1: 扫描 RW 内存 ===", flush=True)
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result = _scan_regions(h_process, rw_regions, ciphertext)
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if result:
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return result
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# Phase 2: 扫描所有可读区域
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print(" === Phase 2: 扫描所有内存 ===", flush=True)
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# 排除已扫描的 RW 区域
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rw_set = set((r[0], r[1]) for r in rw_regions)
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other_regions = [r for r in all_regions if (r[0], r[1]) not in rw_set]
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result = _scan_regions(h_process, other_regions, ciphertext)
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if result:
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return result
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return None
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finally:
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kernel32.CloseHandle(h_process)
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def _scan_regions(h_process, regions, ciphertext):
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"""扫描指定内存区域列表，返回找到的 key 或 None"""
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candidates_32 = 0
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candidates_16 = 0
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t0 = time.time()
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for idx, (base_addr, region_size, _protect) in enumerate(regions):
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if idx % 100 == 0:
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elapsed = time.time() - t0
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print(f" 扫描 {idx}/{len(regions)} ({elapsed:.1f}s)", end='\r', flush=True)
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buffer = ctypes.create_string_buffer(region_size)
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bytes_read = ctypes.c_size_t(0)
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ok = kernel32.ReadProcessMemory(
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h_process, ctypes.c_void_p(base_addr),
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buffer, region_size, ctypes.byref(bytes_read)
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)
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if not ok or bytes_read.value < 32:
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continue
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data = buffer.raw[:bytes_read.value]
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# 用正则找 32 字符 alphanum (C 级速度)
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for m in RE_KEY32.finditer(data):
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key_bytes = m.group()
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candidates_32 += 1
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# 前 16 字符作为 AES-128 key
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fmt = try_key(key_bytes[:16], ciphertext)
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if fmt:
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key_str = key_bytes.decode('ascii')
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print(f"\n*** 找到 AES key (32-char)! → {fmt} ***", flush=True)
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print(f" 完整: {key_str}", flush=True)
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print(f" AES key: {key_str[:16]}", flush=True)
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return key_str[:16]
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# 也试完整 32 字节作 AES-256
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fmt = try_key(key_bytes, ciphertext)
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if fmt:
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key_str = key_bytes.decode('ascii')
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print(f"\n*** 找到 AES key (32-byte)! → {fmt} ***", flush=True)
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print(f" 完整: {key_str}", flush=True)
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return key_str
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# 也找独立的 16 字符 alphanum
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for m in RE_KEY16.finditer(data):
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key_bytes = m.group()
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candidates_16 += 1
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fmt = try_key(key_bytes, ciphertext)
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if fmt:
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key_str = key_bytes.decode('ascii')
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print(f"\n*** 找到 AES key (16-char)! → {fmt} ***", flush=True)
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print(f" AES key: {key_str}", flush=True)
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return key_str
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elapsed = time.time() - t0
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print(f"\n 测试: {candidates_32} x 32-char + {candidates_16} x 16-char ({elapsed:.1f}s)", flush=True)
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return None
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def verify_and_decrypt(attach_dir, aes_key_str, xor_key):
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"""完整解密一个 V2 文件作为验证"""
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v2_magic = b'\x07\x08V2\x08\x07'
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key = aes_key_str.encode('ascii')[:16]
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pattern = os.path.join(attach_dir, "*", "*", "Img", "*_t.dat")
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dat_files = sorted(glob.glob(pattern), key=os.path.getmtime, reverse=True)
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for f in dat_files[:10]:
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try:
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with open(f, 'rb') as fp:
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data = fp.read()
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if data[:6] != v2_magic:
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continue
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sig, aes_size, xor_size = struct.unpack_from('<6sLL', data)
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# AES 对齐: 向上取整到 16 的倍数 (PKCS7 填充)
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aligned_aes_size = aes_size
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aligned_aes_size -= ~(~aligned_aes_size % 16)
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offset = 15
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aes_data = data[offset:offset + aligned_aes_size]
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cipher = AES.new(key, AES.MODE_ECB)
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dec_aes = Padding.unpad(cipher.decrypt(aes_data), AES.block_size)
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offset += aligned_aes_size
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# Raw portion
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raw_data = data[offset:len(data) - xor_size]
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offset += len(raw_data)
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# XOR portion
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xor_data = data[offset:]
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dec_xor = bytes(b ^ xor_key for b in xor_data) if xor_key is not None else xor_data
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result = dec_aes + raw_data + dec_xor
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fmt = "unknown"
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ext = ".bin"
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if result[:3] == b'\xFF\xD8\xFF':
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fmt, ext = "JPEG", ".jpg"
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elif result[:4] == bytes([0x89, 0x50, 0x4E, 0x47]):
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fmt, ext = "PNG", ".png"
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elif result[:4] == b'RIFF':
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fmt, ext = "WEBP", ".webp"
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elif result[:4] == b'wxgf':
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fmt, ext = "WXGF", ".hevc"
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print(f" {os.path.basename(f)} -> {fmt} ({len(result):,}B)", flush=True)
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if fmt != "unknown":
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out_dir = os.path.join(os.path.dirname(os.path.abspath(__file__)), "decoded_images")
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os.makedirs(out_dir, exist_ok=True)
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out_path = os.path.join(out_dir, os.path.splitext(os.path.basename(f))[0] + ext)
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with open(out_path, 'wb') as fp:
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fp.write(result)
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print(f" saved: {out_path}", flush=True)
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return True
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except Exception as e:
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continue
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return False
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def main():
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config_path = os.path.join(os.path.dirname(os.path.abspath(__file__)), 'config.json')
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with open(config_path, encoding="utf-8") as f:
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config = json.load(f)
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db_dir = config['db_dir']
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base_dir = os.path.dirname(db_dir)
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attach_dir = os.path.join(base_dir, 'msg', 'attach')
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# 1. XOR key
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print("=== XOR Key ===", flush=True)
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xor_key = find_xor_key(attach_dir)
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if xor_key is not None:
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print(f"XOR key: 0x{xor_key:02x}", flush=True)
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# 2. V2 ciphertext
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print("\n=== V2 ciphertext ===", flush=True)
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ciphertext, ct_file = find_v2_ciphertext(attach_dir)
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if ciphertext is None:
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print("No V2 .dat files found")
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return
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print(f"File: {ct_file}", flush=True)
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print(f"Cipher: {ciphertext.hex()}", flush=True)
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# 3. Check if already have key in config
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if config.get('image_aes_key'):
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print(f"\nExisting image_aes_key: {config['image_aes_key']}", flush=True)
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fmt = try_key(config['image_aes_key'].encode('ascii')[:16], ciphertext)
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if fmt:
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print(f"Key valid! -> {fmt}", flush=True)
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print("\n=== Verify decrypt ===", flush=True)
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verify_and_decrypt(attach_dir, config['image_aes_key'], xor_key)
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return
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else:
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print("Saved key invalid, re-scanning...", flush=True)
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# 4. Scan memory
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print("\n=== Scanning WeChat process memory ===", flush=True)
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pids = get_wechat_pids()
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if not pids:
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print("WeChat not running!")
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return
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print(f"PIDs: {pids}", flush=True)
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print("Tip: View 2-3 images in WeChat first, then run this script immediately\n", flush=True)
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aes_key = None
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for pid in pids:
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print(f"Scanning PID {pid}...", flush=True)
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aes_key = scan_memory_for_aes_key(pid, ciphertext)
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if aes_key:
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break
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if aes_key:
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print(f"\n=== Result ===", flush=True)
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print(f"AES key: {aes_key}", flush=True)
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print(f"XOR key: 0x{xor_key:02x}" if xor_key is not None else "XOR key: unknown", flush=True)
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config['image_aes_key'] = aes_key
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if xor_key is not None:
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config['image_xor_key'] = xor_key
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with open(config_path, 'w', encoding="utf-8") as f:
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json.dump(config, f, indent=2, ensure_ascii=False)
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print(f"Saved to {config_path}", flush=True)
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print("\n=== Verify decrypt ===", flush=True)
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verify_and_decrypt(attach_dir, aes_key, xor_key)
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else:
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print("\nAES key not found!", flush=True)
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print("Steps:", flush=True)
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print(" 1. Login WeChat and keep it running", flush=True)
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print(" 2. Open Moments or a chat, view 2-3 images (tap to open full size)", flush=True)
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print(" 3. Immediately re-run this script", flush=True)
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if __name__ == '__main__':
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main()
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