Ruben Groenewoud
dbd7ed65a9
* [Rule Tuning] Reverse Shell Rule destination.ip tuning * Updated updated_date
77 lines
2.9 KiB
TOML
77 lines
2.9 KiB
TOML
[metadata]
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creation_date = "2023/07/04"
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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 = "2023/07/25"
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[rule]
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author = ["Elastic"]
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description = """
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This detection rule detects the creation of a shell through a suspicious parent child relationship. Any reverse shells
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spawned by the specified utilities that use a forked process to initialize the connection attempt will be captured
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through this rule. Attackers may spawn reverse shells to establish persistence onto a target system.
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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 Suspicious Parent Process"
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references = [
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"https://github.com/swisskyrepo/PayloadsAllTheThings/blob/master/Methodology%20and%20Resources/Reverse%20Shell%20Cheatsheet.md"
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]
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risk_score = 47
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rule_id = "4b1a807a-4e7b-414e-8cea-24bf580f6fc5"
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severity = "medium"
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tags = ["Domain: Endpoint", "OS: Linux", "Use Case: Threat Detection", "Tactic: Execution"]
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type = "eql"
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query = '''
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sequence by host.id, process.parent.entity_id with maxspan=1s
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[ process where host.os.type == "linux" and event.type == "start" and event.action == "fork" and (
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(process.name : "python*" and process.args : "-c") or
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(process.name : "php*" and process.args : "-r") or
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(process.name : "perl" and process.args : "-e") or
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(process.name : "ruby" and process.args : ("-e", "-rsocket")) or
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(process.name : "lua*" and process.args : "-e") or
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(process.name : "openssl" and process.args : "-connect") or
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(process.name : ("nc", "ncat", "netcat") and process.args_count >= 3) or
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(process.name : "telnet" and process.args_count >= 3) or
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(process.name : "awk")) and
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process.parent.name : ("python*", "php*", "perl", "ruby", "lua*", "openssl", "nc", "netcat", "ncat", "telnet", "awk") ]
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[ network where host.os.type == "linux" and event.type == "start" and event.action == "connection_attempted" and
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process.name : ("python*", "php*", "perl", "ruby", "lua*", "openssl", "nc", "netcat", "ncat", "telnet", "awk") and
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destination.ip != null and destination.ip != "127.0.0.1" and destination.ip != "::1" ]
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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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