TROMMEL

TROMMEL sifts through embedded device files to identify potential vulnerable indicators.

TROMMEL identifies the following indicators related to:

• Secure Shell (SSH) key files
• Secure Socket Layer (SSL) key files
• Internet Protocol (IP) addresses
• Uniform Resource Locator (URL)
• email addresses
• shell scripts
• web server binaries
• configuration files
• database files
• specific binaries files (i.e. Dropbear, BusyBox, etc.)
• shared object library files
• web application scripting variables, and
• Android application package (APK) file permissions.

TROMMEL has also integrated vFeed which allows for further in-depth vulnerability analysis of identified indicators to enrich the output.

Dependencies

• Python-Magic - See documentation for instructions for Python3-magic installation
• vFeed Database - For non-commercial use, register and download the Community Edition database

Usage

$ trommel.py --help

Output TROMMEL results to a file based on a given directory. By default, only searches plain text files.

$ trommel.py -p /directory -o output_file

Output TROMMEL results to a file based on a given directory. Search both binary and plain text files.

$ trommel.py -p /directory -o output_file -b

Notes

• The intended to assist researchers during firmware analysis to find potential vulnerabilities
• Network defenders can benefit as well to assess devices on their network or for devices they plan to add to their network
• Devices can include IoT (web cams, smart devices (light bulbs, plugs, switches, TVs, fridge, coffee maker, etc.)), SCADA/ICS, routers, really anything with an embedded flash chip that boots an OS on startup.
• TROMMEL has been tested using Python3 on Kali Linux x86_64.

References

• vFeed
• Firmwalker
• Lua Code: Security Overview and Practical Approaches to Static Analysis by Andrei Costin

Author

• Kyle O'Meara - komeara AT cert DOT org and @cool_breeze26