plyara 1.2.0

Installation

Install with pip:

pip install plyara

Usage

Use the plyara Python library in your own applications:

>>> import plyara
>>> parser = plyara.Plyara()
>>> mylist = parser.parse_string('rule MyRule { strings: $a="1" \n condition: false }')
>>>
>>> import pprint
>>> pprint.pprint(mylist)
[{'condition_terms': ['false'],
  'raw_condition': 'condition: false',
  'raw_strings': 'strings: $a="1" \n',
  'rule_name': 'MyRule',
  'start_line': 1,
  'stop_line': 2,
  'strings': [{'name': '$a', 'value': '"1"'}]}]
>>>

Or, use the included plyara script from the command line:

$ plyara -h
usage: plyara.py [-h] [--log] FILE

Parse YARA rules into a dictionary representation.

positional arguments:
  FILE        File containing YARA rules to parse.

optional arguments:
  -h, --help  show this help message and exit
  --log       Enable debug logging to the console.

The command-line tool will print valid JSON output when parsing rules:

$ cat example.yar
rule silent_banker : banker
{
    meta:
        description = "This is just an example"
        thread_level = 3
        in_the_wild = true
    strings:
        $a = {6A 40 68 00 30 00 00 6A 14 8D 91}
        $b = {8D 4D B0 2B C1 83 C0 27 99 6A 4E 59 F7 F9}
        $c = "UVODFRYSIHLNWPEJXQZAKCBGMT"
    condition:
        $a or $b or $c
}

$ plyara example.yar
[
    {
        "condition_terms": [
            "$a",
            "or",
            "$b",
            "or",
            "$c"
        ],
        "metadata": {
            "description": "This is just an example",
            "in_the_wild": "true",
            "thread_level": "3"
        },
        "raw_condition": "condition:\n        $a or $b or $c\n",
        "raw_meta": "meta:\n        description = \"This is just an example\"\n        thread_level = 3\n        in_the_wild = true\n    ",
        "raw_strings": "strings:\n        $a = {6A 40 68 00 30 00 00 6A 14 8D 91}\n        $b = {8D 4D B0 2B C1 83 C0 27 99 6A 4E 59 F7 F9}\n        $c = \"UVODFRYSIHLNWPEJXQZAKCBGMT\"\n    ",
        "rule_name": "silent_banker",
        "start_line": 1,
        "stop_line": 13,
        "strings": [
            {
                "name": "$a",
                "value": "{6A 40 68 00 30 00 00 6A 14 8D 91}"
            },
            {
                "name": "$b",
                "value": "{8D 4D B0 2B C1 83 C0 27 99 6A 4E 59 F7 F9}"
            },
            {
                "name": "$c",
                "value": "\"UVODFRYSIHLNWPEJXQZAKCBGMT\""
            }
        ],
        "tags": [
            "banker"
        ]
    }
]

Migration

If you used an older version of plyara, and want to migrate to this version, there will be some changes required. Most importantly, the parser object instantiation has changed. It was:

# Old style - don't do this!
import plyara.interp as interp
rules_list = interp.parseString(open('myfile.yar').read())

But is now:

# New style - do this instead!
import plyara
parser = plyara.Plyara()
rules_list = parser.parse_string(open('myfile.yar').read())

The existing parsed keys have stayed the same, and new ones have been added.

When reusing a parser for multiple rules and/or files, be aware that imports are now shared across all rules - if one rule has an import, that import will be added to all rules in your parser object.

Contributing

• If you find a bug, or would like to see a new feature, Pull Requests and Issues are always welcome.

• By submitting changes, you agree to release those changes under the terms of the LICENSE.

• Writing passing unit tests for your changes, while not required, is highly encouraged and appreciated.