ScanManifest

Parses browser extension's manifest.json.

Source code in strelka/src/python/strelka/scanners/scan_manifest.py

class ScanManifest(strelka.Scanner):
    """Parses browser extension's  manifest.json."""

    def scan(self, data, file, options, expire_at):
        try:
            jsondata = json.loads(data)
            required_keys = ["name", "manifest_version", "version"]
            optional_keys = [
                "content_scripts",
                "content_security_policy",
                "description",
                "permissions",
                "update_url",
                "key",
            ]
            for key in required_keys:
                self.event[key] = jsondata[key]
            for key in optional_keys:
                if jsondata.get(key):
                    if isinstance(jsondata[key], list):
                        self.event[key] = flatten(jsondata[key])
                    else:
                        self.event[key] = jsondata[key]
        except strelka.ScannerTimeout:
            raise
        except Exception:
            self.flags.append("error parsing manifest")
            return

Features

The features of this scanner are detailed below. These features represent the capabilities and the type of analysis the scanner can perform. This may include support for Indicators of Compromise (IOC), the ability to emit files for further analysis, and the presence of extended documentation for complex analysis techniques.

Feature	Support
IOC Support
Emit Files
Extended Docs
Malware Scanner
Image Thumbnails

Tastes

Strelka's file distribution system assigns scanners to files based on 'flavors' and 'tastes'. Flavors describe the type of file, typically determined by MIME types from libmagic, matches from YARA rules, or characteristics of parent files. Tastes are the criteria used within Strelka to determine which scanners are applied to which files, with positive and negative tastes defining files to be included or excluded respectively.

Source Filetype	Include / Exclude
browser_manifest

Scanner Fields

This section provides a list of fields that are extracted from the files processed by this scanner. These fields include the data elements that the scanner extracts from each file, representing the analytical results produced by the scanner. If the test file is missing or cannot be parsed, this section will not contain any data.

Field Name	Field Type
description	str
elapsed	str
flags	list
manifest_version	int
name	str
permissions	list
version	str

Sample Event

Below is a sample event generated by this scanner, demonstrating the kind of output that can be expected when it processes a file. This sample is derived from a mock scan event configured in the scanner's test file. If no test file is available, this section will not display a sample event.

    test_scan_event = {
        "elapsed": 0.001,
        "flags": [],
        "name": "Focus Mode",
        "manifest_version": 3,
        "version": "1.0",
        "description": "Enable reading mode on Chrome's official Extensions and Chrome Web Store documentation.",
        "permissions": ["scripting", "activeTab"],
    }