Ruben Groenewoud
644d2f5b26
* [New Rule] New Systemd Timer Created * improve query runtime performance * added process.name entries for alert reduction * attempt to fix gh unit testing failure * added host.os.type==linux to fix unit test error * Added OSQuery to investigation guides * added additional process names * removed investigation guides to add in future PR * removed investigation guide tag * Changed rule to new_terms rule to reduce FPs * fixed query * formatting fix * Learnt another thing about KQL.. Formatting fix. * unit test fix * Update rules/linux/persistence_systemd_scheduled_timer_created.toml Co-authored-by: eric-forte-elastic <119343520+eric-forte-elastic@users.noreply.github.com> --------- Co-authored-by: Mika Ayenson <Mikaayenson@users.noreply.github.com> Co-authored-by: eric-forte-elastic <119343520+eric-forte-elastic@users.noreply.github.com>
65 lines
2.2 KiB
TOML
65 lines
2.2 KiB
TOML
[metadata]
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creation_date = "2023/02/24"
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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 = "2023/04/05"
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[rule]
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author = ["Elastic"]
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description = """
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Detects the creation of a systemd timer within any of the default systemd timer directories. Systemd timers can be used
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by an attacker to gain persistence, by scheduling the execution of a command or script. Similarly to cron/at, systemd
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timers can be set up to execute on boot time, or on a specific point in time, which allows attackers to regain access in
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case the connection to the infected asset was lost.
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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 = "New Systemd Timer Created"
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references = [
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"https://opensource.com/article/20/7/systemd-timers",
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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 = 21
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rule_id = "7fb500fa-8e24-4bd1-9480-2a819352602c"
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severity = "low"
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tags = ["Elastic", "Host", "Linux", "Threat Detection", "Persistence", "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 : ("creation" or "file_create_event") and file.extension : "timer" and
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file.path : (/etc/systemd/system/* or /usr/local/lib/systemd/system/* or /lib/systemd/system/* or
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/usr/lib/systemd/system/* or /home/*/.config/systemd/user/*) and not
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process.executable : ("/usr/bin/dpkg" or "/usr/bin/dockerd" or "/bin/rpm")
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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 = "T1053.006"
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name = "Systemd Timers"
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reference = "https://attack.mitre.org/techniques/T1053/006/"
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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.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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