A tool to hunt/mine for Cobalt Strike beacons and "reduce" their beacon configuration for later indexing. Hunts can either be expansive and internet wide using services like SecurityTrails, Shodan, or ZoomEye or a list of IP's.
- Install melting-cobalt
- Configure your tokens to begin the hunt
- Mine Beacons to begin reducing them
- Review results
cat results.json | jq
📺 Demo
Requirements: virtualenv, and python3.8+
git clone https://github.com/splunk/melting-cobalt && cd melting-cobaltClone project and cd into the project dir.pip install virtualenv && virtualenv -p python3 venv && source venv/bin/activate && pip install -r requirements.txtCreate Virtualenv and install requirements.
Continue to configuring for SecurityTrails, Shodan, or ZoomEye API key.
Configuration melting-cobalt.conf
Copy melting-cobalt.conf.example to melting-cobalt.conf!
Make sure to set a token for one of the available providers. If you need to create one for your account follow [these](htt://need wiki page) instructions.
Configuration example:
[global]
output = results.json
# stores matches in JSON here
log_path = melting-cobalt.log
# Sets the log_path for the logging file
log_level = INFO
# Sets the log level for the logging
# Possible values: INFO, ERROR, VERBOSE
nse_script = grab_beacon_config.nse
# path to the nse script that rips down cobalt configs. This is specifically using https://github.com/whickey-r7/grab_beacon_config
searches = search.yml
# contains the different searches to run on each internet scanning service provider (eg shodan, zoomeye, security trails) when hunting for team servers.
shodan_token = TOKENHERE
# shodan token for searching
zoomeye_token = TOKENHERE
# zoomeye token for searching
securitytrails_token = TOKENHERE
# security trails token for searching
To modify the default mining performed across different providers, customize search.yml. The default melting-cobalt Search Examples below.
Run:
python melting-cobalt.py
populate ips.txt with potential Cobalt Strike C2 IPs a new line delimeted, example:
1.1.1.1
2.2.2.2
3.3.3.3
Run:
python melting-cobalt.py -i ips.txt
If you need inspiration from hunters we highly recommend:
usage: melting-cobalt.py [-h] [-c CONFIG] [-o OUTPUT] [-v] [-i INPUT]
scans for open cobalt strike team servers and grabs their beacon configs and write this as a json log to be analyzed by any analytic tools
like splunk, elastic, etc..
optional arguments:
-h, --help show this help message and exit
-c CONFIG, --config CONFIG
config file path
-o OUTPUT, --output OUTPUT
file to write to the results, defaults to results.json.log
-v, --version shows current melting-cobalt version
-i INPUT, --input INPUT
newline delimeted file of cobalt strike server ips to grab beacon configs from. example ips.txt
The following searches are provided out of the box and more may be added to search.yml for more data.
Find specific JARM signatures, out of the box we track Cobalt Strike 4.x
'ssl.jarm:07d14d16d21d21d07c42d41d00041d24a458a375eef0c576d23a7bab9a9fb1'
'ssl.jarm:07d14d16d21d21d07c42d41d00041d24a458a375eef0c576d23a7bab9a9fb1 port:"22, 80, 443, 444, 1234, 2000, 2222, 3000, 3780, 4000, 4443, 6379, 7443, 8443, 8080, 8081, 8082, 8087, 8088, 8099, 8089, 8090, 8181, 8888, 8889, 9443, 50050" HTTP/1.1 404 Not Found Content-Length: 0'
'product:"cobalt strike team server"'
note: will generate lots of noisy results, do not actually schedule this unless you want to burn your license credits.
'ssl.cert.serial:146473198'
Find specific JARM signatures
'SELECT address, ports.port FROM ips WHERE jarm = "07d14d16d21d21d07c42d41d00041d24a458a375eef0c576d23a7bab9a9fb1"'
'SELECT address, ports.port, isp.name_normalized, ports.port, address, asn.number, jarm, http.headers.raw FROM ips WHERE jarm = "07d14d16d21d21d07c42d41d00041d24a458a375eef0c576d23a7bab9a9fb1" OR jarm = "07d14d16d21d21d07c07d14d07d21d9b2f5869a6985368a9dec764186a9175" OR jarm = "2ad2ad16d2ad2ad22c42d42d00042d58c7162162b6a603d3d90a2b76865b53" AND http.headers.content_type = "text/plain" AND http.headers.raw = "content-length:0" AND ports.port IN (22, 80, 443, 444, 1234, 2000, 2222, 3000, 3780, 4000, 4443, 6379, 7443, 8443, 8080, 8081, 8082, 8087, 8088, 8099, 8089, 8090, 8181, 8888, 8889, 9443, 50050)'
Please use the GitHub issue tracker to submit bugs or request features.
If you have questions or need support, you can:
- Join the #security-research room in the Splunk Slack channel
- Inspiration came from a handful of blogs:https://michaelkoczwara.medium.com/cobalt-strike-c2-hunting-with-shodan-c448d501a6e2, https://sergiusechel.medium.com/improving-the-network-based-detection-of-cobalt-strike-c2-servers-in-the-wild-while-reducing-the-6964205f6468
- Much of this is only possible because whickey-r7 shared with us grab_beacon_config.nse
- Aan For Contributing the ZoomEye integration!
- Dedup results before nmap
- add checking the most recent result by looking at the latest_updated field
Copyright 2020 Splunk Inc.
Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.