Name:Windows PowerView Kerberos Service Ticket Request id:970455a1-4ac2-47e1-a9a5-9e75443ddcb9 version:3 date:2024-09-30 author:Gowthamaraj Rajendran, Splunk status:production type:TTP Description:The following analytic detects the execution of the `Get-DomainSPNTicket` commandlet, part of the PowerView tool, by leveraging PowerShell Script Block Logging (EventCode=4104). This commandlet requests Kerberos service tickets for specified service principal names (SPNs). Monitoring this activity is crucial as it can indicate attempts to perform Kerberoasting, a technique used to extract SPN account passwords via cracking tools like hashcat. If confirmed malicious, this activity could allow attackers to gain unauthorized access to sensitive accounts, potentially leading to privilege escalation and further network compromise. Data_source:
-Powershell Script Block Logging 4104
search:`powershell` EventCode=4104 ScriptBlockText=*Get-DomainSPNTicket* | stats count min(_time) as firstTime max(_time) as lastTime by EventCode ScriptBlockText Computer UserID | rename Computer as dest | rename UserID as user| `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `windows_powerview_kerberos_service_ticket_request_filter`
how_to_implement:The following analytic requires PowerShell operational logs to be imported. Modify the powershell macro as needed to match the sourcetype or add index. This analytic is specific to 4104, or PowerShell Script Block Logging. known_false_positives:False positive may include Administrators using PowerView for troubleshooting and management. References: -https://powersploit.readthedocs.io/en/latest/Recon/Get-DomainSPNTicket/ -https://book.hacktricks.xyz/windows-hardening/active-directory-methodology/kerberoast -https://github.com/PowerShellMafia/PowerSploit/blob/master/Recon/PowerView.ps1 -https://www.ired.team/offensive-security-experiments/active-directory-kerberos-abuse/t1208-kerberoasting -https://attack.mitre.org/techniques/T1558/003 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: - 'Active Directory Kerberos Attacks' - 'Rhysida Ransomware' asset_type:Endpoint confidence:90 impact:30 message:PowerView commandlets used for requesting SPN service ticket executed on $dest$ mitre_attack_id: - 'T1558' - 'T1558.003' observable: name:'dest' type:'Hostname' - role: - 'Victim' product: - 'Splunk Enterprise' - 'Splunk Enterprise Security' - 'Splunk Cloud' required_fields: - '_time' - 'EventCode' - 'Computer' - 'ScriptBlockText' risk_score:27 security_domain:endpoint
