Ruben Groenewoud
9f41c9f35c
* [New Rule] Upgrade of Non-interactive Shell * Changed numbers to int * Changed severity * [New Rule] Pot. Rev Shell via Background Process * Revert "[New Rule] Pot. Rev Shell via Background Process" This reverts commit bbb36eae26561dbef4bf57f6c1388cebe7a8b88d. * Update rules/linux/execution_interpreter_tty_upgrade.toml
58 lines
1.8 KiB
TOML
58 lines
1.8 KiB
TOML
[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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updated_date = "2023/09/20"
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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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[rule]
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author = ["Elastic"]
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description = """
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Identifies when a non-interactive terminal (tty) is being upgraded to a fully interactive shell. Attackers may upgrade
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a simple reverse shell to a fully interactive tty after obtaining initial access to a host, in order to obtain a more
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stable connection.
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"""
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from = "now-9m"
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index = ["logs-endpoint.events.*", "endgame-*"]
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language = "eql"
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license = "Elastic License v2"
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name = "Potential Upgrade of Non-interactive Shell"
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risk_score = 47
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rule_id = "84d1f8db-207f-45ab-a578-921d91c23eb2"
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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 Endgame",
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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 in ("exec", "exec_event") and event.type == "start" and (
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(process.name == "stty" and process.args == "raw" and process.args == "-echo" and process.args_count >= 3) or
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(process.name == "script" and process.args in ("-qc", "-c") and process.args == "/dev/null" and
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process.args_count == 4)
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)
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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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