Initial Access (TA0001)(external, opens in a new tab or window)
text code block:FROM logs-fortinet_fortigate.*, filebeat-* metadata _id | WHERE event.dataset == "fortinet_fortigate.log" and event.category == "authentication" and event.action == "login" and event.outcome == "success" and source.user.roles == "Administrator" and source.user.name is not null and source.ip is not null | stats Esql.logon_count = count(*), Esql.source_ip_count_distinct = COUNT_DISTINCT(source.ip), Esql.max_timestamp = MAX(@timestamp), Esql.source_ip_values = VALUES(source.ip), Esql.message_values = VALUES(message), Esql.source_geo_country_name_values = VALUES(source.geo.country_name) by source.user.name // last logon event timestamp is within 6m of the rule execution time to avoid duplicates | eval Esql.recent = DATE_DIFF("minute", Esql.max_timestamp, now()) | where Esql.recent <= 6 and Esql.logon_count >= 2 and Esql.source_ip_count_distinct >= 2 // move dynamic fields to ECS equivalent for rule exceptions | eval source.ip = MV_FIRST(Esql.source_ip_values) | keep source.ip, source.user.name, Esql.*
Install detection rules in Elastic Security
Detect FortiGate Administrator Login from Multiple IP Addresses in the Elastic Security detection engine by installing this rule into your Elastic Stack.
To setup this rule, check out the installation guide for Prebuilt Security Detection Rules(external, opens in a new tab or window).