49 lines
1.7 KiB
TOML
49 lines
1.7 KiB
TOML
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[metadata]
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creation_date = "2022/02/24"
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maturity = "production"
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updated_date = "2022/02/24"
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[rule]
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author = ["Elastic"]
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description = """
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Identifies Linux binary awk abuse to breakout out of restricted shells or environments by spawning an
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interactive system shell. This activity is not standard use with this binary for a user or system administrator. It indicates a potentially malicious actor attempting to improve the capabilities or stability of their access.
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"""
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from = "now-9m"
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index = ["logs-endpoint.events.*"]
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language = "eql"
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license = "Elastic License v2"
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name = "Linux Restricted Shell Breakout via awk Commands"
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references = ["https://gtfobins.github.io/gtfobins/nawk/",
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"https://gtfobins.github.io/gtfobins/mawk/"]
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risk_score = 47
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rule_id = "10754992-28c7-4472-be5b-f3770fd04f2d"
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severity = "medium"
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tags = ["Elastic", "Host", "Linux", "Threat Detection", "Defense Evasion", "GTFOBins"]
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timestamp_override = "event.ingested"
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type = "eql"
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query = '''
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sequence by host.id, process.pid with maxspan=1m
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[process where process.name : ("nawk", "mawk", "awk", "gawk") and process.args : "BEGIN {system(*)}"]
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[process where process.parent.name : ("nawk", "mawk", "awk", "gawk") and process.name : ("sh", "bash")]
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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 = "T1548"
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name = "Abuse Elevation Control Mechanism"
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reference = "https://attack.mitre.org/techniques/T1548/"
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[[rule.threat.technique.subtechnique]]
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id = "T1548.004"
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name = "Elevated Execution with Prompt"
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reference = "https://attack.mitre.org/techniques/T1548/004/"
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[rule.threat.tactic]
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id = "TA0005"
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name = "Defense Evasion"
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reference = "https://attack.mitre.org/tactics/TA0005/"
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