67 lines
1.9 KiB
TOML
67 lines
1.9 KiB
TOML
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[metadata]
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creation_date = "2023/09/20"
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integration = ["endpoint"]
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maturity = "production"
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min_stack_comments = "New fields added: required_fields, related_integrations, setup"
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min_stack_version = "8.3.0"
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updated_date = "2023/09/20"
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[rule]
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author = ["Elastic"]
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description = """
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Monitors for the execution of background processes with process arguments capable of opening a socket in the /dev/tcp
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channel. This may indicate the creation of a backdoor reverse connection, and should be investigated further.
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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 = "Potential Reverse Shell via Background Process"
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risk_score = 47
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rule_id = "259be2d8-3b1a-4c2c-a0eb-0c8e77f35e39"
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severity = "medium"
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timestamp_override = "event.ingested"
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tags = ["Domain: Endpoint",
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"OS: Linux",
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"Use Case: Threat Detection",
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"Tactic: Execution",
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"Data Source: Elastic Defend"
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]
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type = "eql"
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query = '''
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process where host.os.type == "linux" and event.action == "exec" and event.type == "start" and
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process.name in ("setsid", "nohup") and process.args : "*/dev/tcp/*0>&1*" and
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process.parent.name in ("bash", "dash", "sh", "tcsh", "csh", "zsh", "ksh", "fish")
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'''
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[[rule.threat]]
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framework = "MITRE ATT&CK"
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[rule.threat.tactic]
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name = "Execution"
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id = "TA0002"
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reference = "https://attack.mitre.org/tactics/TA0002/"
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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]]
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framework = "MITRE ATT&CK"
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[rule.threat.tactic]
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name = "Command and Control"
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id = "TA0011"
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reference = "https://attack.mitre.org/tactics/TA0011/"
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[[rule.threat.technique]]
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name = "Application Layer Protocol"
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id = "T1071"
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reference = "https://attack.mitre.org/techniques/T1071/"
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