Justin Ibarra
53 lines
1.7 KiB
TOML
53 lines
1.7 KiB
TOML
[metadata]
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creation_date = "2020/12/04"
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maturity = "production"
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updated_date = "2021/03/08"
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[rule]
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author = ["Elastic"]
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description = """
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Identifies use of WinRar or 7z to create an encrypted files. Adversaries will often compress and encrypt data in
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preparation for exfiltration.
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"""
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from = "now-9m"
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index = ["logs-endpoint.events.*", "winlogbeat-*", "logs-windows.*"]
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language = "eql"
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license = "Elastic License v2"
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name = "Encrypting Files with WinRar or 7z"
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references = ["https://www.welivesecurity.com/2020/12/02/turla-crutch-keeping-back-door-open/"]
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risk_score = 47
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rule_id = "45d273fb-1dca-457d-9855-bcb302180c21"
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severity = "medium"
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tags = ["Elastic", "Host", "Windows", "Threat Detection", "Collection"]
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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") and
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((process.name:"rar.exe" or process.code_signature.subject_name == "win.rar GmbH" or
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process.pe.original_file_name == "Command line RAR") and
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process.args == "a" and process.args : ("-hp*", "-p*", "-dw", "-tb", "-ta", "/hp*", "/p*", "/dw", "/tb", "/ta"))
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or
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(process.pe.original_file_name in ("7z.exe", "7za.exe") and
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process.args == "a" and process.args : ("-p*", "-sdel"))
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/* uncomment if noisy for backup software related FPs */
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/* not process.parent.executable : ("C:\\Program Files\\*.exe", "C:\\Program Files (x86)\\*.exe") */
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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 = "T1560"
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name = "Archive Collected Data"
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reference = "https://attack.mitre.org/techniques/T1560/"
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[rule.threat.tactic]
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id = "TA0009"
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name = "Collection"
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reference = "https://attack.mitre.org/tactics/TA0009/"
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