Ruben Groenewoud
a7ff449fbc
* [Rule Tuning] Doing some quick tunings * updated_date bump * Update rules/linux/discovery_linux_modprobe_enumeration.toml * Update rules/linux/discovery_linux_modprobe_enumeration.toml * Update rules/linux/discovery_linux_sysctl_enumeration.toml * Update rules/linux/persistence_init_d_file_creation.toml * Update rules/linux/persistence_rc_script_creation.toml * Update rules/linux/persistence_shared_object_creation.toml * deprecate rule * deprecate rule * Update execution_abnormal_process_id_file_created.toml * Update discovery_kernel_module_enumeration_via_proc.toml * Update discovery_linux_modprobe_enumeration.toml * Update execution_remote_code_execution_via_postgresql.toml * Update discovery_potential_syn_port_scan_detected.toml * Added 2 tunings, sorry I missed those.. * One more tune * Update discovery_suspicious_proc_enumeration.toml
100 lines
3.1 KiB
TOML
100 lines
3.1 KiB
TOML
[metadata]
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creation_date = "2023/06/09"
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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, New Term"
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min_stack_version = "8.6.0"
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updated_date = "2023/07/31"
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[rule]
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author = ["Elastic"]
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description = """
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Linux cron jobs are scheduled tasks that can be leveraged by malicious actors for persistence, privilege escalation and
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command execution. By creating or modifying cron job configurations, attackers can execute malicious commands or scripts
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at predefined intervals, ensuring their continued presence and enabling unauthorized activities.
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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 = "Cron Job Created or Changed by Previously Unknown Process"
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references = [
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"https://pberba.github.io/security/2022/01/30/linux-threat-hunting-for-persistence-systemd-timers-cron/"
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]
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risk_score = 47
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rule_id = "ff10d4d8-fea7-422d-afb1-e5a2702369a9"
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severity = "medium"
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tags = ["Domain: Endpoint", "OS: Linux", "Use Case: Threat Detection", "Tactic: Persistence", "Tactic: Privilege Escalation", "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.action : ("change" or "file_modify_event" or "creation" or "file_create_event") and
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file.path : (/etc/cron.allow or /etc/cron.deny or /etc/cron.d/* or /etc/cron.hourly/* or /etc/cron.daily/* or
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/etc/cron.weekly/* or /etc/cron.monthly/* or /etc/crontab or /usr/sbin/cron or /usr/sbin/anacron)
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and not (process.name : ("dpkg" or "dockerd" or "rpm" or "snapd" or "yum" or "exe" or "dnf" or "5") or
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file.extension : ("swp" or "swx"))
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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 = "T1053"
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name = "Scheduled Task/Job"
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reference = "https://attack.mitre.org/techniques/T1053/"
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[[rule.threat.technique.subtechnique]]
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id = "T1053.003"
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name = "Cron"
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reference = "https://attack.mitre.org/techniques/T1053/003/"
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[rule.threat.tactic]
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id = "TA0003"
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name = "Persistence"
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reference = "https://attack.mitre.org/tactics/TA0003/"
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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 = "T1053"
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name = "Scheduled Task/Job"
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reference = "https://attack.mitre.org/techniques/T1053/"
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[[rule.threat.technique.subtechnique]]
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id = "T1053.003"
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name = "Cron"
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reference = "https://attack.mitre.org/techniques/T1053/003/"
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[rule.threat.tactic]
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id = "TA0004"
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name = "Privilege Escalation"
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reference = "https://attack.mitre.org/tactics/TA0004/"
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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 = "T1053"
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name = "Scheduled Task/Job"
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reference = "https://attack.mitre.org/techniques/T1053/"
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[[rule.threat.technique.subtechnique]]
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id = "T1053.003"
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name = "Cron"
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reference = "https://attack.mitre.org/techniques/T1053/003/"
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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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[rule.new_terms]
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field = "new_terms_fields"
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value = ["file.path", "process.name"]
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[[rule.new_terms.history_window_start]]
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field = "history_window_start"
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value = "now-7d"
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