mirror of https://github.com/jackwener/wx-cli.git
256 lines
10 KiB
Python
256 lines
10 KiB
Python
"""
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从微信进程内存中提取所有数据库的缓存raw key
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WCDB为每个DB缓存: x'<64hex_enc_key><32hex_salt>'
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salt嵌在hex字符串中，可以直接匹配DB文件的salt
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"""
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import ctypes
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import ctypes.wintypes as wt
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import struct, os, sys, hashlib, time, re, json
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import hmac as hmac_mod
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from Crypto.Cipher import AES
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import functools
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print = functools.partial(print, flush=True)
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kernel32 = ctypes.windll.kernel32
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MEM_COMMIT = 0x1000
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READABLE = {0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80}
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PAGE_SZ = 4096
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KEY_SZ = 32
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SALT_SZ = 16
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from config import load_config
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_cfg = load_config()
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DB_DIR = _cfg["db_dir"]
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OUT_FILE = _cfg["keys_file"]
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class MBI(ctypes.Structure):
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_fields_ = [
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("BaseAddress", ctypes.c_uint64), ("AllocationBase", ctypes.c_uint64),
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("AllocationProtect", wt.DWORD), ("_pad1", wt.DWORD),
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("RegionSize", ctypes.c_uint64), ("State", wt.DWORD),
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("Protect", wt.DWORD), ("Type", wt.DWORD), ("_pad2", wt.DWORD),
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]
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def get_pid():
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import subprocess
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r = subprocess.run(["tasklist","/FI","IMAGENAME eq Weixin.exe","/FO","CSV","/NH"],
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capture_output=True, text=True)
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best = (0,0)
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for line in r.stdout.strip().split('\n'):
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if not line.strip(): continue
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p = line.strip('"').split('","')
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if len(p)>=5:
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pid=int(p[1]); mem=int(p[4].replace(',','').replace(' K','').strip() or '0')
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if mem>best[1]: best=(pid,mem)
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if not best[0]: print("[ERROR] Weixin.exe 未运行"); sys.exit(1)
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print(f"[+] Weixin.exe PID={best[0]} ({best[1]//1024}MB)")
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return best[0]
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def read_mem(h, addr, sz):
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buf = ctypes.create_string_buffer(sz)
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n = ctypes.c_size_t(0)
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if kernel32.ReadProcessMemory(h, ctypes.c_uint64(addr), buf, sz, ctypes.byref(n)):
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return buf.raw[:n.value]
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return None
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def enum_regions(h):
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regs = []
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addr = 0
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mbi = MBI()
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while addr < 0x7FFFFFFFFFFF:
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if kernel32.VirtualQueryEx(h, ctypes.c_uint64(addr), ctypes.byref(mbi), ctypes.sizeof(mbi))==0: break
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if mbi.State==MEM_COMMIT and mbi.Protect in READABLE and 0<mbi.RegionSize<500*1024*1024:
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regs.append((mbi.BaseAddress, mbi.RegionSize))
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nxt = mbi.BaseAddress + mbi.RegionSize
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if nxt<=addr: break
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addr = nxt
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return regs
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def verify_key_for_db(enc_key, db_page1):
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"""验证enc_key是否能解密这个DB的page 1"""
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salt = db_page1[:SALT_SZ]
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iv = db_page1[PAGE_SZ - 80 : PAGE_SZ - 64]
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encrypted = db_page1[SALT_SZ : PAGE_SZ - 80]
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# HMAC验证 (最可靠)
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mac_salt = bytes(b ^ 0x3a for b in salt)
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mac_key = hashlib.pbkdf2_hmac("sha512", enc_key, mac_salt, 2, dklen=KEY_SZ)
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hmac_data = db_page1[SALT_SZ : PAGE_SZ - 80 + 16]
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stored_hmac = db_page1[PAGE_SZ - 64 : PAGE_SZ]
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h = hmac_mod.new(mac_key, hmac_data, hashlib.sha512)
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h.update(struct.pack('<I', 1))
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return h.digest() == stored_hmac
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def main():
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print("=" * 60)
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print(" 提取所有微信数据库密钥")
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print("=" * 60)
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# 1. 收集所有DB文件及其salt
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db_files = []
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salt_to_dbs = {} # salt_hex -> [(rel_path, db_page1), ...]
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for root, dirs, files in os.walk(DB_DIR):
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for f in files:
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if f.endswith('.db') and not f.endswith('-wal') and not f.endswith('-shm'):
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path = os.path.join(root, f)
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rel = os.path.relpath(path, DB_DIR)
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sz = os.path.getsize(path)
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if sz < PAGE_SZ:
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continue
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with open(path, 'rb') as fh:
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page1 = fh.read(PAGE_SZ)
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salt = page1[:SALT_SZ].hex()
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db_files.append((rel, path, sz, salt, page1))
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if salt not in salt_to_dbs:
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salt_to_dbs[salt] = []
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salt_to_dbs[salt].append(rel)
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print(f"\n找到 {len(db_files)} 个数据库, {len(salt_to_dbs)} 个不同的salt")
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for salt_hex, dbs in sorted(salt_to_dbs.items(), key=lambda x: len(x[1]), reverse=True):
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print(f" salt {salt_hex}: {', '.join(dbs)}")
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# 2. 打开进程
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pid = get_pid()
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h = kernel32.OpenProcess(0x0010 | 0x0400, False, pid)
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if not h:
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print("[ERROR] 无法打开进程"); sys.exit(1)
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regions = enum_regions(h)
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total_mb = sum(s for _,s in regions)/1024/1024
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print(f"[+] 可读内存: {len(regions)} 区域, {total_mb:.0f}MB")
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# 3. 搜索所有 x'<hex>' 模式
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print(f"\n搜索 x'<hex>' 缓存密钥...")
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hex_re = re.compile(b"x'([0-9a-fA-F]{64,192})'")
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# 结果: salt_hex -> enc_key_hex
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key_map = {}
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all_hex_matches = 0
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t0 = time.time()
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for reg_idx, (base, size) in enumerate(regions):
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data = read_mem(h, base, size)
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if not data: continue
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for m in hex_re.finditer(data):
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hex_str = m.group(1).decode()
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addr = base + m.start()
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all_hex_matches += 1
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hex_len = len(hex_str)
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if hex_len == 96:
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# enc_key(32bytes=64hex) + salt(16bytes=32hex)
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enc_key_hex = hex_str[:64]
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salt_hex = hex_str[64:]
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if salt_hex in salt_to_dbs and salt_hex not in key_map:
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# 验证!
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enc_key = bytes.fromhex(enc_key_hex)
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# 找到对应的page1
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for rel, path, sz, s, page1 in db_files:
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if s == salt_hex:
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if verify_key_for_db(enc_key, page1):
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key_map[salt_hex] = enc_key_hex
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dbs = salt_to_dbs[salt_hex]
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print(f"\n [FOUND] salt={salt_hex}")
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print(f" enc_key={enc_key_hex}")
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print(f" 地址: 0x{addr:016X}")
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print(f" 数据库: {', '.join(dbs)}")
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break
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elif hex_len == 64:
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# 只有enc_key, 没有salt - 需要逐个DB试
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enc_key_hex = hex_str
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enc_key = bytes.fromhex(enc_key_hex)
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for rel, path, sz, salt_hex_db, page1 in db_files:
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if salt_hex_db not in key_map:
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if verify_key_for_db(enc_key, page1):
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key_map[salt_hex_db] = enc_key_hex
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dbs = salt_to_dbs[salt_hex_db]
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print(f"\n [FOUND] salt={salt_hex_db}")
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print(f" enc_key={enc_key_hex}")
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print(f" 地址: 0x{addr:016X}")
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print(f" 数据库: {', '.join(dbs)}")
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break
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elif hex_len > 96 and hex_len % 2 == 0:
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# 可能是 enc_key + hmac_key + salt 或其他格式
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# 取前64作为enc_key, 后32作为salt
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enc_key_hex = hex_str[:64]
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salt_hex = hex_str[-32:]
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if salt_hex in salt_to_dbs and salt_hex not in key_map:
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enc_key = bytes.fromhex(enc_key_hex)
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for rel, path, sz, s, page1 in db_files:
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if s == salt_hex:
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if verify_key_for_db(enc_key, page1):
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key_map[salt_hex] = enc_key_hex
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dbs = salt_to_dbs[salt_hex]
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print(f"\n [FOUND] salt={salt_hex} (long hex {hex_len})")
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print(f" enc_key={enc_key_hex}")
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print(f" 地址: 0x{addr:016X}")
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print(f" 数据库: {', '.join(dbs)}")
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break
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# 进度
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if (reg_idx + 1) % 200 == 0:
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elapsed = time.time() - t0
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progress = sum(s for b,s in regions[:reg_idx+1]) / sum(s for _,s in regions) * 100
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print(f" [{progress:.1f}%] {len(key_map)}/{len(salt_to_dbs)} salts matched, "
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f"{all_hex_matches} hex patterns, {elapsed:.1f}s")
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elapsed = time.time() - t0
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print(f"\n扫描完成: {elapsed:.1f}s, {all_hex_matches} hex模式")
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# 4. 如果有未找到的salt，用已找到的key做交叉验证
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# (WCDB有时对同一passphrase的不同DB用同一enc_key，如果salt相同)
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missing_salts = set(salt_to_dbs.keys()) - set(key_map.keys())
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if missing_salts and key_map:
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print(f"\n还有 {len(missing_salts)} 个salt未匹配，尝试交叉验证...")
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for salt_hex in list(missing_salts):
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for rel, path, sz, s, page1 in db_files:
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if s == salt_hex:
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for known_salt, known_key_hex in key_map.items():
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enc_key = bytes.fromhex(known_key_hex)
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if verify_key_for_db(enc_key, page1):
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key_map[salt_hex] = known_key_hex
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print(f" [CROSS] salt={salt_hex} 可用 key from salt={known_salt}")
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missing_salts.discard(salt_hex)
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break
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# 5. 输出结果
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print(f"\n{'='*60}")
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print(f"结果: {len(key_map)}/{len(salt_to_dbs)} salts 找到密钥")
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result = {}
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for rel, path, sz, salt_hex, page1 in db_files:
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if salt_hex in key_map:
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result[rel] = {
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"enc_key": key_map[salt_hex],
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"salt": salt_hex,
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"size_mb": round(sz/1024/1024, 1)
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}
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print(f" OK: {rel} ({sz/1024/1024:.1f}MB)")
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else:
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print(f" MISSING: {rel} (salt={salt_hex})")
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with open(OUT_FILE, 'w') as f:
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json.dump(result, f, indent=2)
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print(f"\n密钥保存到: {OUT_FILE}")
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missing = [rel for rel, path, sz, salt_hex, page1 in db_files if salt_hex not in key_map]
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if missing:
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print(f"\n未找到密钥的数据库:")
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for rel in missing:
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print(f" {rel}")
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kernel32.CloseHandle(h)
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if __name__ == '__main__':
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main()
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