diff --git a/rules/linux/persistence_pluggable_authentication_module_source_download.toml b/rules/linux/persistence_pluggable_authentication_module_source_download.toml new file mode 100644 index 00000000000..c80244fef6e --- /dev/null +++ b/rules/linux/persistence_pluggable_authentication_module_source_download.toml @@ -0,0 +1,72 @@ +[metadata] +creation_date = "2024/12/16" +integration = ["endpoint"] +maturity = "production" +updated_date = "2024/12/16" + +[rule] +author = ["Elastic"] +description = """ +This rule detects the usage of `curl` or `wget` to download the source code of a Pluggable Authentication Module (PAM) +shared object file. Attackers may download the source code of a PAM shared object file to create a backdoor in the +authentication process. +""" +false_positives = [ + "Trusted system module updates or allowed Pluggable Authentication Module (PAM) daemon configuration changes.", +] +from = "now-9m" +index = ["logs-endpoint.events.process*", "endgame-*"] +language = "eql" +license = "Elastic License v2" +name = "Pluggable Authentication Module (PAM) Source Download" +references = [ + "https://github.com/zephrax/linux-pam-backdoor", + "https://github.com/eurialo/pambd", + "http://0x90909090.blogspot.com/2016/06/creating-backdoor-in-pam-in-5-line-of.html", + "https://www.trendmicro.com/en_us/research/19/i/skidmap-linux-malware-uses-rootkit-capabilities-to-hide-cryptocurrency-mining-payload.html", +] +risk_score = 21 +rule_id = "53ef31ea-1f8a-493b-9614-df23d8277232" +severity = "low" +tags = [ + "Domain: Endpoint", + "OS: Linux", + "Use Case: Threat Detection", + "Tactic: Credential Access", + "Tactic: Persistence", + "Data Source: Elastic Defend", + "Data Source: Elastic Endgame", +] +timestamp_override = "event.ingested" +type = "eql" +query = ''' +process where host.os.type == "linux" and event.type == "start" and event.action in ("exec", "exec_event") and +process.name in ("curl", "wget") and +process.args like~ "https://github.com/linux-pam/linux-pam/releases/download/v*/Linux-PAM-*.tar.xz" +''' + +[[rule.threat]] +framework = "MITRE ATT&CK" + +[[rule.threat.technique]] +id = "T1543" +name = "Create or Modify System Process" +reference = "https://attack.mitre.org/techniques/T1543/" + +[rule.threat.tactic] +id = "TA0003" +name = "Persistence" +reference = "https://attack.mitre.org/tactics/TA0003/" + +[[rule.threat]] +framework = "MITRE ATT&CK" + +[[rule.threat.technique]] +id = "T1556" +name = "Modify Authentication Process" +reference = "https://attack.mitre.org/techniques/T1556/" + +[rule.threat.tactic] +id = "TA0006" +name = "Credential Access" +reference = "https://attack.mitre.org/tactics/TA0006/"