diff --git a/rules/linux/defense_evasion_attempt_to_disable_iptables_or_firewall.toml b/rules/linux/defense_evasion_attempt_to_disable_iptables_or_firewall.toml new file mode 100644 index 000000000..98e5de2b4 --- /dev/null +++ b/rules/linux/defense_evasion_attempt_to_disable_iptables_or_firewall.toml @@ -0,0 +1,63 @@ +[metadata] +creation_date = "2023/02/22" +integration = ["endpoint"] +maturity = "production" +min_stack_comments = "New fields added: required_fields, related_integrations, setup" +min_stack_version = "8.3.0" +updated_date = "2023/02/22" + +[rule] +author = ["Elastic"] +description = """ +Adversaries may attempt to disable the iptables or firewall service in an attempt to affect how a host is allowed to +receive or send network traffic. +""" +from = "now-9m" +index = ["logs-endpoint.events.*"] +language = "eql" +license = "Elastic License v2" +name = "Attempt to Disable IPTables or Firewall" +risk_score = 21 +rule_id = "83e9c2b3-24ef-4c1d-a8cd-5ebafb5dfa2f" +severity = "low" +tags = ["Elastic", "Host", "Linux", "Threat Detection", "Defense Evasion"] +timestamp_override = "event.ingested" +type = "eql" +query = ''' +process where event.type == "start" and event.action == "exec" and + ( + /* disable FW */ + ( + (process.name == "ufw" and process.args == "disable") or + (process.name == "iptables" and process.args == "-F" and process.args_count == 2) + ) or + + /* stop FW service */ + ( + ((process.name == "service" and process.args == "stop") or + (process.name == "chkconfig" and process.args == "off") or + (process.name == "systemctl" and process.args in ("disable", "stop", "kill"))) and + process.args in ("firewalld", "ip6tables", "iptables") + ) + ) +''' + + +[[rule.threat]] +framework = "MITRE ATT&CK" +[[rule.threat.technique]] +name = "Impair Defenses" +id = "T1562" +reference = "https://attack.mitre.org/techniques/T1562/" +[[rule.threat.technique.subtechnique]] +name = "Disable or Modify Tools" +id = "T1562.001" +reference = "https://attack.mitre.org/techniques/T1562/001/" + + + +[rule.threat.tactic] +name = "Defense Evasion" +id = "TA0005" +reference = "https://attack.mitre.org/tactics/TA0005/" +