shashank-elastic
51b2d9da4b
* Linux binary(s) shell evasion threat Co-authored-by: Samirbous <64742097+Samirbous@users.noreply.github.com> Co-authored-by: Colson Wilhoit <48036388+DefSecSentinel@users.noreply.github.com> Co-authored-by: Samirbous <64742097+Samirbous@users.noreply.github.com> Co-authored-by: Terrance DeJesus <99630311+terrancedejesus@users.noreply.github.com>
52 lines
1.7 KiB
TOML
52 lines
1.7 KiB
TOML
[metadata]
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creation_date = "2022/02/24"
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deprecation_date = "2022/05/09"
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maturity = "deprecated"
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updated_date = "2022/05/09"
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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 interactive system
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shell. The awk utility is a text processing language used for data extraction and reporting tools and the activity of
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spawning shell is not a standard use of this binary for a user or system administrator. It indicates a potentially
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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/", "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", "Execution", "GTFOBins"]
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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 == "start" and process.name in ("sh", "bash", "dash") and
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process.parent.name in ("nawk", "mawk", "awk", "gawk") and process.parent.args : "BEGIN {system(*)}"
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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 = "T1059"
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name = "Command and Scripting Interpreter"
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reference = "https://attack.mitre.org/techniques/T1059/"
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[[rule.threat.technique.subtechnique]]
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id = "T1059.004"
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name = "Unix Shell"
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reference = "https://attack.mitre.org/techniques/T1059/004/"
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[rule.threat.tactic]
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id = "TA0002"
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name = "Execution"
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reference = "https://attack.mitre.org/tactics/TA0002/"
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