Name:Windows Kerberos Local Successful Logon id:8309c3a8-4d34-48ae-ad66-631658214653 version:5 date:2024-11-28 author:Michael Haag, Splunk status:production type:TTP Description:The following analytic identifies a local successful authentication event on a Windows endpoint using the Kerberos package. It detects EventCode 4624 with LogonType 3 and source address 127.0.0.1, indicating a login to the built-in local Administrator account. This activity is significant as it may suggest a Kerberos relay attack, a method attackers use to escalate privileges. If confirmed malicious, this could allow an attacker to gain unauthorized access to sensitive systems, execute arbitrary code, or create new accounts in Active Directory, leading to potential system compromise. Data_source:
-Windows Event Log Security 4624
search:`wineventlog_security` EventCode=4624 LogonType=3 AuthenticationPackageName=Kerberos action=success src=127.0.0.1 | stats count min(_time) as firstTime max(_time) as lastTime by dest, subject, action, SubjectLogonId, user, TargetUserName, src | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `windows_kerberos_local_successful_logon_filter`
how_to_implement:To successfully implement this search, you need to be ingesting Windows Security Event Logs with 4624 EventCode enabled. The Windows TA is also required. known_false_positives:False positives are possible, filtering may be required to restrict to workstations vs domain controllers. Filter as needed. References: -https://github.com/Dec0ne/KrbRelayUp 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 ("$dest$") starthoursago=168 | 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:'$info_min_time$' latest_offset:'$info_max_time$' tags: analytic_story: - 'Local Privilege Escalation With KrbRelayUp' - 'Active Directory Kerberos Attacks' - 'Compromised Windows Host' asset_type:Endpoint confidence:80 impact:80 message:A successful localhost Kerberos authentication event occurred on $dest$, possibly indicative of Kerberos relay attack. mitre_attack_id: - 'T1558' observable: name:'dest' type:'Endpoint' - role: - 'Victim' product: - 'Splunk Enterprise' - 'Splunk Enterprise Security' - 'Splunk Cloud' required_fields: - '_time' - 'dest' - 'subject' - 'action' - 'Security_ID' - 'user' - 'TargetUserName' - 'src_ip' risk_score:64 security_domain:endpoint
