diff --git a/rules/linux/persistence_systemd_scheduled_timer_created.toml b/rules/linux/persistence_systemd_scheduled_timer_created.toml new file mode 100644 index 000000000..37b1ac28a --- /dev/null +++ b/rules/linux/persistence_systemd_scheduled_timer_created.toml @@ -0,0 +1,64 @@ +[metadata] +creation_date = "2023/02/24" +integration = ["endpoint"] +maturity = "production" +min_stack_comments = "New fields added: required_fields, related_integrations, setup, New Term" +min_stack_version = "8.6.0" +updated_date = "2023/04/05" + +[rule] +author = ["Elastic"] +description = """ +Detects the creation of a systemd timer within any of the default systemd timer directories. Systemd timers can be used +by an attacker to gain persistence, by scheduling the execution of a command or script. Similarly to cron/at, systemd +timers can be set up to execute on boot time, or on a specific point in time, which allows attackers to regain access in +case the connection to the infected asset was lost. +""" +from = "now-9m" +index = ["logs-endpoint.events.*", "endgame-*"] +language = "kuery" +license = "Elastic License v2" +name = "New Systemd Timer Created" +references = [ + "https://opensource.com/article/20/7/systemd-timers", + "https://pberba.github.io/security/2022/01/30/linux-threat-hunting-for-persistence-systemd-timers-cron/" +] +risk_score = 21 +rule_id = "7fb500fa-8e24-4bd1-9480-2a819352602c" +severity = "low" +tags = ["Elastic", "Host", "Linux", "Threat Detection", "Persistence", "Elastic Endgame"] +timestamp_override = "event.ingested" +type = "new_terms" + +query = ''' +host.os.type : "linux" and event.action : ("creation" or "file_create_event") and file.extension : "timer" and +file.path : (/etc/systemd/system/* or /usr/local/lib/systemd/system/* or /lib/systemd/system/* or +/usr/lib/systemd/system/* or /home/*/.config/systemd/user/*) and not +process.executable : ("/usr/bin/dpkg" or "/usr/bin/dockerd" or "/bin/rpm") +''' + +[[rule.threat]] +framework = "MITRE ATT&CK" +[[rule.threat.technique]] +id = "T1053" +name = "Scheduled Task/Job" +reference = "https://attack.mitre.org/techniques/T1053/" +[[rule.threat.technique.subtechnique]] +id = "T1053.006" +name = "Systemd Timers" +reference = "https://attack.mitre.org/techniques/T1053/006/" + + + +[rule.threat.tactic] +id = "TA0003" +name = "Persistence" +reference = "https://attack.mitre.org/tactics/TA0003/" + + +[rule.new_terms] +field = "new_terms_fields" +value = ["file.path", "process.name"] +[[rule.new_terms.history_window_start]] +field = "history_window_start" +value = "now-7d"