A honeypot for the Log4Shell vulnerability (CVE-2021-44228).# Log4Pot
A honeypot for the Log4Shell vulnerability (CVE-2021-44228).
License: [GPLv3.0](https://www.gnu.org/licenses/gpl-3.0.html)
## 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 | .[]
```
[4.0K] /data/pocs/a66cf4f6ff7cf896aff089983ba5a81de79a7589
├── [ 10] default-url-allowlist
├── [ 144] default-url-denylist
├── [ 34K] LICENSE
├── [4.0K] log4pot
│ ├── [2.3K] deobfuscator.py
│ ├── [1.0K] expression_parser.py
│ ├── [ 0] __init__.py
│ ├── [5.6K] loganalyzer.py
│ ├── [9.8K] payloader.py
│ └── [2.2K] s3.py
├── [ 284] log4pot.conf.example
├── [4.4K] log4pot-loganalyzer.py
├── [ 10K] log4pot-server.py
├── [ 36K] poetry.lock
├── [ 460] pyproject.toml
├── [2.1K] README.md
├── [4.0K] responses
│ ├── [ 64] default.json
│ ├── [ 12K] sap-netweaver.html
│ ├── [1.9K] tomcat-default.html
│ └── [3.8K] vmware-esx-4.html
└── [4.0K] test
├── [1.2K] test_deobfuscation.py
└── [ 482] test_payloader.py
3 directories, 21 files