shashank-elastic
334aa12aaf
* expect shell evasion threat * expect shell evasion threat * Update rules/linux/defense_evasion_expect_binary.toml Co-authored-by: Colson Wilhoit <48036388+DefSecSentinel@users.noreply.github.com>
68 lines
2.1 KiB
TOML
68 lines
2.1 KiB
TOML
[metadata]
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creation_date = "2022/03/07"
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maturity = "development"
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updated_date = "2022/03/07"
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[rule]
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author = ["Elastic"]
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description = """
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Identifies Linux binary expect abuse to break out from restricted environments by spawning an interactive system shell
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This activity is not standard use with this binary for a user or system administrator and could potentially indicate
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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 the expect command"
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references = ["https://gtfobins.github.io/gtfobins/expect/"]
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risk_score = 47
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rule_id = "fd3fc25e-7c7c-4613-8209-97942ac609f6"
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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 == "expect" and process.args : "-c" and process.args : ("spawn /bin/sh;interact", "spawn /bin/bash;interact", "spawn /bin/dash;interact", "spawn sh;interact","spawn bash;interact", "spawn dash;interact")]
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[process where process.parent.name == "expect" and process.name : ("bash", "sh", "dash")]
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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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[[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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