The pattern-matcher is a prototype software tool for matching STIX Observed Data content against patterns used in STIX Indicators. The matcher accepts a pattern and one or more timestamped observations, and determines whether the observations match the criteria specified by the pattern. The purpose of this tool is to evaluate examples and test cases which implement the patterning specification, as a form of executable documentation and to verify patterns express the desired criteria.
- Python 3.6+
- ANTLR Python Runtime (4.7+)
- python-dateutil (https://dateutil.readthedocs.io/en/stable/)
- six (https://six.readthedocs.io/)
- stix2-patterns (https://github.com/oasis-open/cti-pattern-validator)
- (For running tests) - pytest (http://pytest.org/latest/getting-started.html)
Install with pip:
$ pip install stix2-matcher
Installing the package creates a
$ stix2-matcher -h usage: stix2-matcher [-h] -p PATTERNS -f FILE [-e ENCODING] [-v] [-s STIX_VERSION] Match STIX Patterns to STIX Observed Data optional arguments: -h, --help show this help message and exit -p PATTERNS, --patterns PATTERNS Specify a file containing STIX Patterns, one per line. -f FILE, --file FILE A file containing JSON list of STIX observed-data SDOs to match against. -e ENCODING, --encoding ENCODING Set encoding used for reading observation and pattern files. Must be an encoding name Python understands. Default is utf8. -v, --verbose Be verbose -s STIX_VERSION, --stix_version STIX_VERSION Stix specification version. Default is 2.0
The STIX Pattern Matcher’s test suite can be run with pytest.
Updating the Grammar
The ANTLR pattern grammar is maintained in the stix2-json-schemas repository. If the grammar changes, the code in this repository should be updated to match. To do so, use the Java ANTLR package to generate new Python source files. (The .jar file is not needed for normal use of the validator).
Download antlr-4.7-complete.jar from http://www.antlr.org/download/
Clone the stix2-json-schemas repository or download the STIXPattern.g4 file.
Change to the directory containing the STIXPattern.g4 file.
Run the following command
$ java -jar "/path/to/antlr-4.7-complete.jar" -Dlanguage=Python3 STIXPattern.g4 -o /path/to/cti-pattern-matcher/stix2matcher/grammars
Commit the resulting files to git.
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