{"id":93,"date":"2014-05-18T16:38:36","date_gmt":"2014-05-18T16:38:36","guid":{"rendered":""},"modified":"2014-05-18T16:38:36","modified_gmt":"2014-05-18T16:38:36","slug":"","status":"publish","type":"post","link":"http:\/\/weizn.net\/?p=93","title":{"rendered":"[\u8f6c]shellcode API \u81ea\u52a8\u5b9a\u4f4d"},"content":{"rendered":"
\n
\n\t\t1.\u80cc\u666f\u77e5\u8bc6\u8865\u5145\n\t<\/div>\n
\n\t\t\u5728\u4f7f\u7528shellcode\u7684\u65f6\u5019\u6709\u4e2a\u5f88\u5927\u7684\u95ee\u9898\u5c31\u662f\u52a8\u6001\u5b9a\u4f4dAPI\uff0c\u4e0b\u9762\u8fd9\u6bb5\u4ee3\u7801\u4ecb\u7ecd\u7684\u662f\u5229\u7528PE\u7ed3\u6784\u6765\u5bfb\u5740API\u7684\u65b9\u6cd5\u3002\n\t<\/div>\n
\n\t\t\u6b65\u9aa4\uff1a\n\t<\/div>\n
\n\t\ta.\u627e\u5230PEB\n\t<\/div>\n
\n\t\tb.\u627e\u5230PEB_LDR_DATA\n\t<\/div>\n
\n\t\tc.\u627e\u5230InInitializationOrderModuleList\n\t<\/div>\n
\n\t\td.\u627e\u5230kernel32.dll\u57fa\u5730\u5740\n\t<\/div>\n
\n\t\te.\u627e\u5230PE\u5934\n\t<\/div>\n
\n\t\tf.\u627e\u5230\u51fd\u6570\u5bfc\u51fa\u8868\n\t<\/div>\n
\n\t\tg.\u5229\u7528\u5bfc\u51fa\u8868\u7684AddressOfFunctions , AddressOfNames,
\nAddressOfNameOrdinals\u8fd9\u4e09\u4e2a\u8868\u6765\u5bfb\u627eAPI\u5730\u5740\u3002\n\t<\/div>\n
\n\t\t\u76f4\u63a5\u5728\u4ee3\u7801\u4e2d\u6765\u770b\u5427\n\t<\/div>\n

2.\u4ee3\u7801\u5206\u6790<\/p>\n

\n\t\t\n\t<\/div>\n
\n
\n\t\t\tCLD;\u6e05\u96f6CF\u6807\u5fd7\u4f4d\uff0c\u4f7f\u540e\u9762\u7684LODSD,STOSD\u7b49\u65b9\u5411\u786e\u5b9a\n\t\t<\/div>\n
\n\t\t\tpush 0x1e380a6a ;hash code of MessageBoxA\n\t\t<\/div>\n
\n\t\t\tpush 0x4fd18963 ;hash code of ExitProcess\n\t\t<\/div>\n
\n\t\t\tpush 0x0c917432 ;hash code of
\nLoadLibraryA;\u4ee5\u4e0aHASH\u65b9\u5f0f\u5373\u5faa\u73af\u53f3\u79fb7\u4f4d\u7d2f\u52a0\n\t\t<\/div>\n
\n\t\t\tmov esi, esp;esi\u6307\u5411\u7684\u662f\u8fd93\u4e2ahash\u7801\n\t\t<\/div>\n
\n\t\t\tlea edi, [esi – 0xc];edi\u73b0\u5728\u4e0d\u7528\u7ba1\uff0c\u4ee5\u540e\u5b58\u50a8\u627e\u5230\u7684API\u5730\u5740\u4f7f\u4f1a\u7528\u5230\n\t\t<\/div>\n
\n\t\t\t\n\t\t<\/div>\n
\n\t\t\t;make some stack space\n\t\t<\/div>\n
\n\t\t\txor ebx, ebx\n\t\t<\/div>\n
\n\t\t\tmov bh, 0x04\n\t\t<\/div>\n
\n\t\t\tsub esp, ebx\n\t\t<\/div>\n
\n\t\t\t\n\t\t<\/div>\n
\n\t\t\t;push a pointer to “user32” onto stack\n\t\t<\/div>\n
\n\t\t\tmov bx, 0x3233;push ’32’\n\t\t<\/div>\n
\n\t\t\tpush ebx\n\t\t<\/div>\n
\n\t\t\tpush 0x72657375; push ‘user’\n\t\t<\/div>\n
\n\t\t\tpush esp\n\t\t<\/div>\n
\n\t\t\txor edx, edx;\u4ee5\u4e0a\u8fd9\u6bb5\u4ee3\u7801\u7684\u76ee\u7684\u662f\u4e3a\u8c03\u7528LoadLibraryA\u9884\u5148\u51c6\u5907\u597d\u53c2\u6570\n\t\t<\/div>\n
\n\t\t\t\n\t\t<\/div>\n
\n\t\t\t;\u4e0b\u9762\u8fd9\u6bb5\u4ee3\u7801\u6211\u7740\u91cd\u8bf4\u660e\u4e00\u4e0b\uff1a\n\t\t<\/div>\n
\n\t\t\t;fs:[edx + 0x30]\u6307\u5411\u7684\u662fPEB\n\t\t<\/div>\n
\n\t\t\t;PEB\u4e2d\u504f\u79fb0x0c\u5904\u5373\u6307\u5411PEB_LDR_DATA\u7684\u6307\u9488\n\t\t<\/div>\n
\n\t\t\t;PEB_LDR_DATA\u7ed3\u6784\u5982\u4e0b\n\t\t<\/div>\n
\n
\n\t\t\t\t typedef struct _PEB_LDR_DATA<\/span>

\n {<\/span>

\n \u3000ULONG Length; \/\/ +0x00<\/span>

\n \u3000BOOLEAN Initialized; \/\/ +0x04<\/span>

\n \u3000PVOID SsHandle; \/\/ +0x08<\/span>

\n \u3000LIST_ENTRY InLoadOrderModuleList; \/\/ +0x0c<\/span>

\n \u3000LIST_ENTRY InMemoryOrderModuleList; \/\/ +0x14<\/span>

\n \u3000LIST_ENTRY InInitializationOrderModuleList;\/\/ +0x1c<\/span>

\n } PEB_LDR_DATA,*PPEB_LDR_DATA; \/\/ +0x24<\/span><\/span>\n\t\t\t<\/div>\n<\/p><\/div>\n
\n\t\t\t;\u4e0d\u96be\u770b\u51fa\u6211\u4eec\u6240\u9700\u8981\u7684InInitializationOrderModuleList\u5728\u504f\u79fb\u4e3a0x1c\u5904\n\t\t<\/div>\n
\n\t\t\t;\u81f3\u4e8e\u5982\u4f55\u7531InInitializationOrderModuleList\u5f97\u5230DLLBASE\u6211\u4eec\u6765\u770b\u4e0b\u8fd9\u4e24\u4e2a\u7ed3\u6784<\/span>\n\t\t<\/div>\n
\n\t\t\t typedef struct _LIST_ENTRY {<\/span>\n\t\t<\/div>\n
\n\t\t\t    struct _LIST_ENTRY *Flink;<\/span>

\n    struct _LIST_ENTRY *Blink;<\/span>

\n } LIST_ENTRY, *PLIST_ENTRY, *RESTRICTED_POINTER PRLIST_ENTRY;<\/span><\/span><\/span>\n\t\t<\/div>\n
\n\t\t\t
\n<\/span><\/span><\/span>\n\t\t<\/div>\n
\n
\n\t\t\t\t typedef struct _LDR_DATA_TABLE_ENTRY<\/span>

\n {<\/span>

\n      LIST_ENTRY InLoadOrderLinks;<\/span>

\n      LIST_ENTRY InMemoryOrderLinks;<\/span>

\n      LIST_ENTRY InInitializationOrderLinks;<\/span>

\n      PVOID DllBase;<\/span>

\n      PVOID EntryPoint;<\/span>

\n      ULONG SizeOfImage;<\/span>

\n      UNICODE_STRING FullDllName;<\/span>

\n      UNICODE_STRING BaseDllName;<\/span>

\n      ULONG Flags;<\/span>

\n      WORD LoadCount;<\/span>

\n      WORD TlsIndex;<\/span>

\n      union<\/span>

\n      {<\/span>

\n           LIST_ENTRY HashLinks;<\/span>

\n           struct<\/span>

\n           {<\/span>

\n                PVOID SectionPointer;<\/span>

\n                ULONG CheckSum;<\/span>

\n           };<\/span>

\n      };<\/span>

\n      union<\/span>

\n      {<\/span>

\n           ULONG TimeDateStamp;<\/span>

\n           PVOID LoadedImports;<\/span>

\n      };<\/span>

\n      _ACTIVATION_CONTEXT * EntryPointActivationContext;<\/span>

\n      PVOID PatchInformation;<\/span>

\n      LIST_ENTRY ForwarderLinks;<\/span>

\n      LIST_ENTRY ServiceTagLinks;<\/span>

\n      LIST_ENTRY StaticLinks;<\/span>

\n } LDR_DATA_TABLE_ENTRY, *PLDR_DATA_TABLE_ENTRY;<\/span><\/span><\/span><\/span>\n\t\t\t<\/div>\n<\/p><\/div>\n
\n\t\t\t;\u9996\u5148\u5f97\u5230InInitializationOrderModuleList\u4e4b\u540e\uff0c\u7531\u4e8e\u5b83\u662f\u4e00\u4e2aLIST_ENTRY\u7ed3\u6784\uff0c\u4e14\u7ed3\u6784\u7684\u7b2c\u4e00\u4e2a\u6210\u5458\u662fFLINK,\u6240\u4ee5\u76f4\u63a5\u7528\u4ee3\u7801mov
\necx,[ecx]\u5373\u53ef\u4ee5\u5f97\u5230\u7b2c\u4e00\u4e2a\u6210\u5458\u53d8\u91cf\uff08\u5373\u94fe\u8868\u4e0a\u9762\u7b2c\u4e8c\u4e2a\u8282\u70b9\uff09\u3002\u8fd9\u91cc\u8981\u6ce8\u610f\u4e00\u4e0b\uff0c\u5728win7\u73af\u5883\u4e2d\uff0c\u7b2c3\u4e2a\u8282\u70b9\u624d\u662fkernel32.dll\u6240\u5728\u3002<\/span>\n\t\t<\/div>\n
\n\t\t\t;\u90a3\u4e48\u5f97\u5230LIST_ENTRY\u4e4b\u540e\u4e3a\u4ec0\u4e48\u4f7f\u7528mov
\nebp, [ecx +
\n0x08]\u5c31\u80fd\u5f97\u5230kernel32.dll\u7684\u57fa\u5730\u5740\u5462\uff0c\u4ed4\u7ec6\u770bLDR_DATA_TABLE_ENTRY\u7ed3\u6784\uff0c\u5b9e\u9645\u4e0a<\/span>InInitializationOrderModuleList\u4e0a\u7684\u8282\u70b9\u4e5f\u662f\u8fd9\u4e2a\u7ed3\u6784\u7684\u6210\u5458\u3002\u7531\u4e8e\u5728\u8fd9\u4e2a\u7ed3\u6784\u4e2d\uff0cDLLBASE\u7d27\u63a5\u7740<\/span>InInitializationOrderModuleList\uff0c\u6240\u4ee5\u52a08\u5c31\u80fd\u5f97\u5230\u5176\u5730\u5740\u4e86\u3002\u6362\u8a00\u4e4b\uff0c\u5982\u679c\u60f3\u7528<\/span>InOrderList\u5f97\u5230DLLBASE\uff0c\u5c31\u5f97\u52a00x18\u3002<\/span><\/span>\n\t\t<\/div>\n
\n\t\t\t;find base_addr of kernel32.dll\n\t\t<\/div>\n
\n\t\t\tmov ebx, fs:[edx + 0x30] \n\t\t<\/div>\n
\n\t\t\tmov ecx, [ebx + 0x0c]\n\t\t<\/div>\n
\n\t\t\tmov ecx, [ecx + 0x1C]\n\t\t<\/div>\n
\n\t\t\tmov ecx, [ecx]\n\t\t<\/div>\n
\n\t\t\tmov ebp, [ecx + 0x08]\n\t\t<\/div>\n
\n\t\t\t\n\t\t<\/div>\n
\n\t\t\t\u8fd9\u6bb5\u4ee3\u7801\u5149\u770b\u7684\u8bdd\u5f88\u5bb9\u6613\u8fdb\u5165\u8bef\u533a\uff0c\u5c31\u662fcall [edi – 0x8]\u4e3a\u4ec0\u4e48\u5c31\u662f\u8c03\u7528LoadLibraryA<\/span>\u5462?\u5b9e\u9645\u4e0a\uff0c\u7531\u4e8e\u524d\u9762LoadLibraryA\u662f\u5728\u90a33\u4e2aHASH\u7801\u7684\u5e95\u90e8\uff0c\u6240\u4ee5\u8fd9\u6bb5\u4ee3\u7801\u662f\u5148\u88ab\u8df3\u8fc7\u7684\uff0c\u7b49\u5230\u540e\u9762LoadLibraryA\u4ee5\u53caExitProcess\u90fd\u5bfb\u5740\u5b8c\u6bd5\u540e\u624d\u4f1a\u8c03\u7528\u3002\u8fd8\u8bb0\u5f97\u524d\u9762\u8bb2\u8fc7EDI\u6307\u5411\u7684\u662f\u5df2\u7ecf\u88ab\u5bfb\u5740\u7684API\u7684\u5730\u5740\u5417\uff1f\u6240\u4ee5\u8fd9\u91cc<\/span>call
\n[edi -0x8]<\/span>\u5f88\u597d\u7406\u89e3\u3002<\/span>\n\t\t<\/div>\n
\n\t\t\tfind_lib_functions:\n\t\t<\/div>\n
\n\t\t\tlodsd \n\t\t<\/div>\n
\n\t\t\tcmp eax, 0x1e380a6a\n\t\t<\/div>\n
\n\t\t\tjne find_functions\n\t\t<\/div>\n
\n\t\t\txchg eax, ebp\n\t\t<\/div>\n
\n\t\t\tcall [edi -0x8]\n\t\t<\/div>\n
\n\t\t\txchg eax, ebp\n\t\t<\/div>\n
\n\t\t\t\n\t\t<\/div>\n
\n\t\t\t;\u8fd9\u4e2a\u5730\u65b9\u5f04\u660e\u767d\u8fd9\u51e0\u4e2a\u5e38\u91cf\u7684\u542b\u4e49\uff1a\n\t\t<\/div>\n
\n\t\t\t1.0x3c\u5b83\u662f\u57fa\u4e8eDLLBASE\u7684\u6307\u5411PE\u5934\u7684\u504f\u79fb\n\t\t<\/div>\n
\n\t\t\t2.0X78\u5b83\u662f\u57fa\u4e8eDLLBASE\u7684\u6307\u5411\u5bfc\u51fa\u8868\u7684\u504f\u79fb\n\t\t<\/div>\n
\n\t\t\t3.0X20\u5b83\u662f\u57fa\u4e8eDLLBASE\u7684\u6307\u5411\u51fd\u6570\u540d\u79f0\u8868AddressOfNames\u7684\u504f\u79fb\n\t\t<\/div>\n
\n\t\t\tfind_functions:\n\t\t<\/div>\n
\n\t\t\tpushad ;preserve registers\n\t\t<\/div>\n
\n\t\t\tmov eax, [ebp + 0x3c]\n\t\t<\/div>\n
\n\t\t\tmov ecx, [ebp + eax + 0x78]\n\t\t<\/div>\n
\n\t\t\tadd ecx, ebp \n\t\t<\/div>\n
\n\t\t\tmov ebx, [ecx + 0x20]\n\t\t<\/div>\n
\n\t\t\tadd ebx, ebp \n\t\t<\/div>\n
\n\t\t\txor edi, edi\n\t\t<\/div>\n
\n\t\t\t\n\t\t<\/div>\n
\n\t\t\t;\u8fd9\u6bb5\u4ee3\u7801\u662f\u9010\u6b21\u53d6\u5f97\u540d\u79f0\u8868\u4e2d\u7684\u5404\u9879\n\t\t<\/div>\n
\n\t\t\tnext_function_loop:\n\t\t<\/div>\n
\n\t\t\tinc edi\n\t\t<\/div>\n
\n\t\t\tmov esi, [ebx + edi * 4]\n\t\t<\/div>\n
\n\t\t\tadd esi, ebp \n\t\t<\/div>\n
\n\t\t\tcdq \n\t\t<\/div>\n
\n\t\t\t\n\t\t<\/div>\n
\n\t\t\t;\u7136\u540e\u7528\u627e\u5230\u7684\u5404\u9879\u751f\u6210HASH\u7801\n\t\t<\/div>\n
\n\t\t\thash_loop:\n\t\t<\/div>\n
\n\t\t\tmovsx eax, byte ptr[esi]\n\t\t<\/div>\n
\n\t\t\tcmp al,
\nah;\u8fd9\u91cc\u6bd4\u8f83\u96be\u7406\u89e3\uff0c\u5b9e\u9645\u4e0a\u662f\u4e3a\u4e86\u5224\u65ad\u540d\u79f0\u662f\u5426\u7ed3\u675f\uff08\u7531\u4e8eshellcode\u4e2d\u4e0d\u80fd\u51fa\u73b0\u7ed3\u675f\u7b260\uff0c\u6240\u4ee5\u7528\u8fd9\u53e5\u8bdd\u4ee3\u66ff\uff09\n\t\t<\/div>\n
\n\t\t\tjz compare_hash\n\t\t<\/div>\n
\n\t\t\tror edx, 7\n\t\t<\/div>\n
\n\t\t\tadd edx, eax\n\t\t<\/div>\n
\n\t\t\tinc esi\n\t\t<\/div>\n
\n\t\t\tjmp hash_loop\n\t\t<\/div>\n
\n\t\t\t\n\t\t<\/div>\n
\n\t\t\tcompare_hash:\n\t\t<\/div>\n
\n\t\t\tcmp edx, [esp + 0x1c];\u8fd9\u91cc\u7684[esp +
\n0x1c]\u4e3a\u4ec0\u4e48\u53d6\u5f97\u5c31\u662f\u8981\u6bd4\u8f83\u7684HASH\u5462\uff0c\u8fd9\u91cc\u5b9e\u9645\u4e0a\u662f\u4e4b\u524d\u7528PUSHAD\u5c06\u5bc4\u5b58\u5668\u7ec4\u538b\u6808\u4e4b\u540e\uff0c\u8fd9\u91cc\u5728\u4f7f\u7528\u5f53\u65f6\u538b\u5165\u7684EAX\n\t\t<\/div>\n
\n\t\t\tjnz next_function_loop\n\t\t<\/div>\n
\n\t\t\t;\u8fd9\u91cc\u8981\u4ecb\u7ecd\u4e00\u4e0b\u901a\u8fc7\u90a3\u4e09\u4e2a\u8868AddressOfFunctions , AddressOfNames,
\nAddressOfNameOrdinals\u5bfb\u5740API\u7684\u65b9\u6cd5\u3002\u9996\u5148\u5728<\/span>AddressOfNames\u4e2d\u83b7\u5f97\u5bf9\u5e94\u540d\u79f0\u7684\u9879\u53f7\uff0c\u7136\u540e\u5728<\/span>AddressOfNameOrdinals\u4e2d\u901a\u8fc7\u8be5\u9879\u53f7\u627e\u5230\u771f\u6b63\u7684\u5728<\/span>AddressOfFunctions<\/span> \u4e2d\u7684\u9879\u53f7\uff0c\u6700\u540e\u5728<\/span>AddressOfFunctions<\/span> \u4e2d\u5bfb\u5740\u3002\u5373\uff0c\u5730\u5740
\n= <\/span>AddressOfFunctions[<\/span>AddressOfNameOrdinals[\u540d\u79f0\u8868\u4e2d\u7684\u9879\u53f7]]\u3002\u8fd9\u91cc\u5c31\u6bd4\u8f83\u7591\u60d1\u4e86\uff0c\u4e3a\u4ec0\u4e48\u4e2d\u95f4\u8981\u8d70<\/span>AddressOfNameOrdinals\u8fd9\u4e2a\u8868\u5462\uff0c\u5b9e\u9645\u4e0a\uff0c\u7531\u4e8e\u4e0d\u662f\u6240\u6709\u7684API\u90fd\u6709\u540d\u5b57\uff0c\u6240\u4ee5\u8bf4<\/span>AddressOfNames\u7684\u9879\u6570\u80af\u5b9a\u8981\u6bd4<\/span>AddressOfFunctions<\/span> \u4e2d\u5c11\uff0c\u4e14\u5b83\u4eec\u5e76\u4e0d\u662f\u4e00\u4e00\u5bf9\u5e94\u7684\uff0c\u6240\u4ee5\u8981\u8fd9\u4e48\u505a\u3002<\/span>\n\t\t<\/div>\n

\"77e2fe96gc4fcc138149e&690.png\"<\/a><\/p>\n

\n\t\t\tmov ebx, [ecx + 0x24];\u540d\u79f0\u5e8f\u53f7\u8868\u7684\u504f\u79fb\n\t\t<\/div>\n
\n\t\t\tadd ebx, ebp\n\t\t<\/div>\n
\n\t\t\tmov di, [ebx + 2 * edi];\u5f97\u5230\u51fd\u6570\u5730\u5740\u8868\u7684\u9879\u53f7\n\t\t<\/div>\n
\n\t\t\tmov ebx, [ecx + 0x1c];\u51fd\u6570\u5730\u5740\u8868\u7684\u504f\u79fb\n\t\t<\/div>\n
\n\t\t\tadd ebx, ebp\n\t\t<\/div>\n
\n\t\t\tadd ebp, [ebx + 4 * edi];\u5f97\u5230\u51fd\u6570\u5730\u5740\n\t\t<\/div>\n
\n\t\t\txchg eax, ebp\n\t\t<\/div>\n
\n\t\t\tpop edi\n\t\t<\/div>\n
\n\t\t\tstosd\n\t\t<\/div>\n
\n\t\t\tpush edi\n\t\t<\/div>\n
\n\t\t\tpopad\n\t\t<\/div>\n
\n\t\t\tcmp eax, 0x1e380a6a\n\t\t<\/div>\n
\n\t\t\tjne find_lib_functions\n\t\t<\/div>\n
\n\t\t\tfunction_call:\n\t\t<\/div>\n
\n\t\t\txor ebx, ebx\n\t\t<\/div>\n
\n\t\t\tpush ebx\n\t\t<\/div>\n
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