FwHunt Community Scanner

Tools for analyzing UEFI firmware and checking UEFI modules with FwHunt rules.

Dependencies

rizin (v0.6.2)

Installation

Install with pip (tested on python3.6 and above):

$ python -m pip install fwhunt-scan

Install manually:

$ git clone https://github.com/binarly-io/fwhunt-scan.git && cd fwhunt-scan
$ python setup.py install

Example

With script

Analyze/scan separate module:

$ python3 fwhunt_scan_analyzer.py analyze-module {image_path} -o out.json
$ python3 fwhunt_scan_analyzer.py scan-module --rule {rule_path} {image_path}

Scan the entire firmware image:

$ python3 fwhunt_scan_analyzer.py scan-firmware -r rules/BRLY-2021-001.yml -r rules/BRLY-2021-004.yml -r rules/RsbStuffingCheck.yml test/fw.bin

With docker

To avoid installing dependencies, you can use the docker image.

You can build a docker image locally as follows:

docker build -t fwhunt_scan .

Or pull the latest image from ghcr.

Example of use:

docker run --rm -it -v {module_path}:/tmp/image:ro \
  fwhunt_scan analyze-module /tmp/image # to analyze EFI module

docker run --rm -it -v {module_path}:/tmp/image:ro -v {rule_path}:/tmp/rule.yml:ro \
  fwhunt_scan scan-module /tmp/image -r /tmp/rule.yml # to scan EFI module with specified FwHunt rule

docker run --rm -it -v {module_path}:/tmp/image:ro -v {rule_path}:/tmp/rule.yml:ro \
  fwhunt_scan scan-firmware /tmp/image -r /tmp/rule.yml # to scan firmware image with specified FwHunt rule

docker run --rm -it -v {module_path}:/tmp/image:ro -v {rules_directory}:/tmp/rules:ro \
  fwhunt_scan scan-firmware /tmp/image --rules_dir /tmp/rules # to scan firmware image with specified rules directory

All these steps are automated in the fwhunt_scan_docker.py script:

python3 fwhunt_scan_docker.py analyze-module {module_path} # to analyze EFI module

python3 fwhunt_scan_docker.py scan-module -r {rule_path} {module_path} # to scan EFI module with specified FwHunt rule

python3 fwhunt_scan_docker.py scan-firmware -r {rule_path} {firmware_path} # to scan firmware image with specified FwHunt rule

python3 fwhunt_scan_docker.py scan-firmware --rules_dir {rules_directory} {firmware_path} # to scan firmware image with specified rules directory

From code

UefiAnalyzer

Basic usage examples:

from fwhunt_scan import UefiAnalyzer

...
uefi_analyzer = UefiAnalyzer(image_path=module_path)
print(uefi_analyzer.get_summary())
uefi_analyzer.close()

from fwhunt_scan import UefiAnalyzer

...
with UefiAnalyzer(image_path=module_path) as uefi_analyzer:
    print(uefi_analyzer.get_summary())

On Linux platforms, you can pass blob for analysis instead of file:

from fwhunt_scan import UefiAnalyzer

...
with UefiAnalyzer(blob=data) as uefi_analyzer:
    print(uefi_analyzer.get_summary())

UefiScanner

from fwhunt_scan import UefiAnalyzer, UefiRule, UefiScanner

...
uefi_analyzer = UefiAnalyzer(module_path)

# rule1 and rule2 - contents of the rules on YAML format
uefi_rules = [UefiRule(rule1), UefiRule(rule2)]

scanner = UefiScanner(uefi_analyzer, uefi_rules)
result = scanner.result