Ruben Groenewoud
e5d6d6e4a7
* [New Rule] sus cmds executed by unknown executable * added an event.action filter * Added endgame support, fixed stack version comment * Update execution_suspicious_executable_running_system_commands.toml * Update rules/linux/execution_suspicious_executable_running_system_commands.toml Co-authored-by: Jonhnathan <26856693+w0rk3r@users.noreply.github.com> * Update execution_suspicious_executable_running_system_commands.toml --------- Co-authored-by: Jonhnathan <26856693+w0rk3r@users.noreply.github.com>
71 lines
2.6 KiB
TOML
71 lines
2.6 KiB
TOML
[metadata]
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creation_date = "2023/06/14"
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integration = ["endpoint"]
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maturity = "production"
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min_stack_comments = "The single field New Term rule type used in this rule was added in Elastic 8.4"
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min_stack_version = "8.4.0"
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updated_date = "2023/06/14"
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[rule]
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author = ["Elastic"]
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description = """
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This rule monitors for the execution of several commonly used system commands executed by a previously unknown
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executable located in commonly abused directories. An alert from this rule can indicate the presence of potentially
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malicious activity, such as the execution of unauthorized or suspicious processes attempting to run malicious code.
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Detecting and investigating such behavior can help identify and mitigate potential security threats, protecting the
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system and its data from potential compromise.
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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 = "kuery"
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license = "Elastic License v2"
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name = "Suspicious System Commands Executed by Previously Unknown Executable"
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risk_score = 21
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rule_id = "e9001ee6-2d00-4d2f-849e-b8b1fb05234c"
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severity = "low"
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tags = ["Domain: Endpoint", "OS: Linux", "Use Case: Threat Detection", "Tactic: Execution", "Data Source: Elastic Endgame"]
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timestamp_override = "event.ingested"
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type = "new_terms"
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query = '''
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host.os.type : "linux" and event.category : "process" and
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event.action : ("exec" or "exec_event" or "fork" or "fork_event") and
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process.executable : (
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/bin/* or /usr/bin/* or /usr/share/* or /tmp/* or /var/tmp/* or /dev/shm/* or
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/etc/init.d/* or /etc/rc*.d/* or /etc/crontab or /etc/cron.*/* or /etc/update-motd.d/* or
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/usr/lib/update-notifier/* or /home/*/.* or /boot/* or /srv/* or /run/*
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) and process.args : (
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"whoami" or "id" or "hostname" or "uptime" or "top" or "ifconfig" or "netstat" or "route" or
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"ps" or "pwd" or "ls"
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) and not process.name : (
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"sudo" or "which" or "whoami" or "id" or "hostname" or "uptime" or "top" or "netstat" or "ps" or
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"pwd" or "ls" or "apt" or "dpkg" or "yum" or "rpm" or "dnf" or "dockerd" or "snapd" or "snap"
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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.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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name = "Command and Scripting Interpreter"
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id = "T1059"
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reference = "https://attack.mitre.org/techniques/T1059/"
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[[rule.threat.technique.subtechnique]]
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name = "Unix Shell"
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id = "T1059.004"
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reference = "https://attack.mitre.org/techniques/T1059/004/"
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[rule.new_terms]
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field = "new_terms_fields"
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value = ["process.executable"]
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[[rule.new_terms.history_window_start]]
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field = "history_window_start"
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value = "now-14d"
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