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>
54 lines
1.9 KiB
TOML
54 lines
1.9 KiB
TOML
[metadata]
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creation_date = "2022/03/10"
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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 SSH abuse to break out from restricted environments by spawning an interactive system shell. The
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SSH protocol is a network protocol that gives users, particularly system administrators, a secure way to access a
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computer over a network. The activity of spawning shell is not a standard use of this binary for a user or system
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administrator. It indicates a potentially malicious actor attempting to improve the capabilities or stability of their
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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 SSH command"
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references = ["https://gtfobins.github.io/gtfobins/ssh/"]
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risk_score = 47
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rule_id = "97da359b-2b61-4a40-b2e4-8fc48cf7a294"
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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 : ("bash", "sh", "dash") and
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process.parent.name == "ssh" and process.parent.args == "-o" and
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process.parent.args in ("ProxyCommand=;sh 0<&2 1>&2", "ProxyCommand=;bash 0<&2 1>&2", "ProxyCommand=;dash 0<&2 1>&2", "ProxyCommand=;/bin/sh 0<&2 1>&2", "ProxyCommand=;/bin/bash 0<&2 1>&2", "ProxyCommand=;/bin/dash 0<&2 1>&2")
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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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