Justin Ibarra
94 lines
2.6 KiB
TOML
94 lines
2.6 KiB
TOML
[metadata]
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creation_date = "2020/02/18"
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maturity = "production"
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updated_date = "2021/03/03"
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[rule]
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author = ["Elastic"]
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description = """
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Windows contains accessibility features that may be launched with a key combination before a user has logged in. An
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adversary can modify the way these programs are launched to get a command prompt or backdoor without logging in to the
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system.
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"""
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from = "now-9m"
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index = ["winlogbeat-*", "logs-endpoint.events.*", "logs-windows.*"]
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language = "eql"
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license = "Elastic License v2"
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name = "Potential Modification of Accessibility Binaries"
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references = ["https://www.elastic.co/blog/practical-security-engineering-stateful-detection"]
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risk_score = 73
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rule_id = "7405ddf1-6c8e-41ce-818f-48bea6bcaed8"
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severity = "high"
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tags = ["Elastic", "Host", "Windows", "Threat Detection", "Persistence"]
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timestamp_override = "event.ingested"
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type = "eql"
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query = '''
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process where event.type in ("start", "process_started", "info") and
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process.parent.name : ("Utilman.exe", "winlogon.exe") and user.name == "SYSTEM" and
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process.args :
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(
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"C:\\Windows\\System32\\osk.exe",
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"C:\\Windows\\System32\\Magnify.exe",
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"C:\\Windows\\System32\\Narrator.exe",
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"C:\\Windows\\System32\\Sethc.exe",
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"utilman.exe",
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"ATBroker.exe",
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"DisplaySwitch.exe",
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"sethc.exe"
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)
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and not process.pe.original_file_name in
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(
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"osk.exe",
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"sethc.exe",
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"utilman2.exe",
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"DisplaySwitch.exe",
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"ATBroker.exe",
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"ScreenMagnifier.exe",
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"SR.exe",
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"Narrator.exe",
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"magnify.exe",
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"MAGNIFY.EXE"
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)
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/* uncomment once in winlogbeat to avoid bypass with rogue process with matching pe original file name */
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/* and process.code_signature.subject_name == "Microsoft Windows" and process.code_signature.status == "trusted" */
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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 = "T1546"
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name = "Event Triggered Execution"
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reference = "https://attack.mitre.org/techniques/T1546/"
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[[rule.threat.technique.subtechnique]]
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id = "T1546.008"
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name = "Accessibility Features"
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reference = "https://attack.mitre.org/techniques/T1546/008/"
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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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[[rule.threat]]
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framework = "MITRE ATT&CK"
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[[rule.threat.technique]]
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id = "T1546"
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name = "Event Triggered Execution"
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reference = "https://attack.mitre.org/techniques/T1546/"
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[[rule.threat.technique.subtechnique]]
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id = "T1546.008"
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name = "Accessibility Features"
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reference = "https://attack.mitre.org/techniques/T1546/008/"
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[rule.threat.tactic]
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id = "TA0004"
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name = "Privilege Escalation"
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reference = "https://attack.mitre.org/tactics/TA0004/"
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