Mika Ayenson
59 lines
1.7 KiB
TOML
59 lines
1.7 KiB
TOML
[metadata]
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creation_date = "2023/08/22"
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integration = ["endpoint"]
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maturity = "production"
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min_stack_comments = "New fields added: required_fields, related_integrations, setup"
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min_stack_version = "8.3.0"
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updated_date = "2024/04/05"
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[rule]
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author = ["Elastic"]
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description = """
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Identifies the install of browser extensions. Malicious browser extensions can be installed via app store downloads
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masquerading as legitimate extensions, social engineering, or by an adversary that has already compromised a system.
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"""
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from = "now-9m"
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index = ["logs-endpoint.events.file-*"]
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language = "eql"
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license = "Elastic License v2"
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name = "Browser Extension Install"
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risk_score = 21
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rule_id = "f97504ac-1053-498f-aeaa-c6d01e76b379"
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severity = "low"
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tags = ["Domain: Endpoint", "OS: Windows", "Use Case: Threat Detection", "Tactic: Persistence", "Data Source: Elastic Defend"]
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timestamp_override = "event.ingested"
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type = "eql"
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query = '''
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file where host.os.type == "windows" and event.action : "creation" and
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(
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/* Firefox-Based Browsers */
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(
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file.name : "*.xpi" and
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file.path : "?:\\Users\\*\\AppData\\Roaming\\*\\Profiles\\*\\Extensions\\*.xpi" and
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not
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(
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process.name : "firefox.exe" and
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file.name : ("langpack-*@firefox.mozilla.org.xpi", "*@dictionaries.addons.mozilla.org.xpi")
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)
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) or
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/* Chromium-Based Browsers */
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(
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file.name : "*.crx" and
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file.path : "?:\\Users\\*\\AppData\\Local\\*\\*\\User Data\\Webstore Downloads\\*"
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)
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)
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'''
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[[rule.threat]]
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framework = "MITRE ATT&CK"
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[[rule.threat.technique]]
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id = "T1176"
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name = "Browser Extensions"
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reference = "https://attack.mitre.org/techniques/T1176/"
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[rule.threat.tactic]
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id = "TA0003"
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name = "Persistence"
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reference = "https://attack.mitre.org/tactics/TA0003/"
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