Log4Pot

A honeypot for the Log4Shell vulnerability (CVE-2021-44228).

License: GPLv3.0

Features

• Listen on various ports for Log4Shell exploitation.
• Detect exploitation in request line and headers.
• Download exploit payloads recursively.
• Log to file and Azure blob storage.

Usage

1. Install Poetry: curl -sSL https://raw.githubusercontent.com/python-poetry/poetry/master/get-poetry.py | python3 -
2. Fetch this GitHub repository git clone https://github.com/thomaspatzke/Log4Pot.git
3. Change directory into the local copy with cd Log4Pot
4. Install pycurl dependencies (Debian / Ubuntu): apt install libcurl4-openssl-dev libssl-dev python3-dev build-essential
5. Install python dependencies: poetry install
6. Put parameters into log4pot.conf, see poetry run python log4pot.py --help for an overview.
7. Run: poetry run python log4pot.py @log4pot.conf

Alternatively, you can also run log4pot without external dependencies:

$ python log4pot.py @log4pot.conf

This will run log4pot without support for logging to Azure blob storage.

Redirecting traffic / non-container setup

To redirect traffic to port 80 and 443 to Log4Pot, use following iptables commands:

iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j REDIRECT --to-port 8080

iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 443 -j REDIRECT --to-port 8443

Log Analysis Tool

The script log4pot-loganalyzer.py extracts all payloads, decodes them with the current decoder and builds a timeline from both. Use is as follows:

python log4pot-loganalyzer.py -o <output directory> <input log files>

Analyzing Logs with JQ

List payloads from exploitation attempts:

select(.type == "exploit") | .payload

Decode all base64-encoded payloads from JNDI exploit:

select(.type == "exploit" and (.payload | contains("Base64"))) | .payload | sub(".*/Base64/"; "") | sub ("}$"; "") | @base64d

Extract all SHA256 hashes from files downloaded from URLs:

[ .[] | select(.type == "payload") | .urls | select((. | length) > 0) | to_entries | .[].value | select((. | length) == 64) ] | unique | .[]