Terrance DeJesus
e9f5585a9f
* updated content to reflect changes from Security Docs team * Update rules/linux/execution_flock_binary.toml * Update rules/linux/execution_expect_binary.toml * TOML linting * added escape for crdential_access_spn_attribute_modified.toml
50 lines
1.6 KiB
TOML
50 lines
1.6 KiB
TOML
[metadata]
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creation_date = "2022/02/24"
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maturity = "production"
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updated_date = "2022/04/29"
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[rule]
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author = ["Elastic"]
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description = """
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Identifies Linux binary env abuse to break out from restricted environments by spawning an interactive system shell. The
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env utility is a shell command for Unix-like operating systems and is used to print a list of environment variables. The
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activity of spawning a shell is not a standard use of this binary for a user or system administrator. It indicates a
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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 env Shell Evasion"
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references = ["https://gtfobins.github.io/gtfobins/env/"]
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risk_score = 47
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rule_id = "72d33577-f155-457d-aad3-379f9b750c97"
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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 : "env" and process.args_count == 2 and process.args : ("/bin/sh", "/bin/bash", "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 = "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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