Name:ESXi External Root Login Activity id:218bf991-6c63-4c26-a682-6ac1a53ad8f8 version:4 date:None author:Raven Tait, Splunk status:production type:Anomaly Description:This detection identifies instances where the ESXi UI is accessed using the root account instead of a delegated administrative user. Direct root access to the UI bypasses role-based access controls and auditing practices, and may indicate risky behavior, misconfiguration, or unauthorized activity by a malicious actor using compromised credentials. Data_source:
-VMWare ESXi Syslog
search:`esxi_syslog` Message="*root*" AND Message="*logged in*" | rex field=_raw "root@(?<SrcIpAddr>\d{1,3}(?:\.\d{1,3}){3})" | rex field=_raw "Z (?<dest>[\w\.]+)\s" | search SrcIpAddr != "127.0.0.1" AND SrcIpAddr != 192.168.0.0/16 AND SrcIpAddr != 172.16.0.0/12 AND SrcIpAddr != 10.0.0.0/8 | stats min(_time) as firstTime max(_time) as lastTime count by dest SrcIpAddr | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `esxi_external_root_login_activity_filter`
how_to_implement:This is based on syslog data generated by VMware ESXi hosts. To implement this search, you must configure your ESXi systems to forward syslog output to your Splunk deployment. These logs must be ingested with the appropriate Splunk Technology Add-on for VMware ESXi Logs, which provides field extractions and CIM compatibility. known_false_positives:Limited false positives in most environments, however tune as needed. Administrators may use the root account for troubleshooting or initial user creation. References: drilldown_searches: name:'View the detection results for - "$dest$"' search:'%original_detection_search% | search dest = "$dest$"' earliest_offset:'$info_min_time$' latest_offset:'$info_max_time$' name:'View risk events for the last 7 days for - "$dest$"' search:'| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$dest$") | stats count min(_time) as firstTime max(_time) as lastTime values(search_name) as "Search Name" values(risk_message) as "Risk Message" values(analyticstories) as "Analytic Stories" values(annotations._all) as "Annotations" values(annotations.mitre_attack.mitre_tactic) as "ATT&CK Tactics" by normalized_risk_object | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`' earliest_offset:'7d' latest_offset:'0' analytic_story:['ESXi Post Compromise', 'Black Basta Ransomware']
