Techniques
Sample rules
Windows PowerView SPN Discovery
- source: splunk
- technicques:
- T1558
- T1558.003
Description
The following analytic utilizes PowerShell Script Block Logging (EventCode=4104) to identify the execution of the Get-DomainUser or Get-NetUSer commandlets with specific parameters. These commandlets are part of PowerView, a PowerShell tool used to perform enumeration and discovery on Windows Active Directory networks. As the names suggest, these commandlets are used to identify domain users in a network and combining them with the -SPN parameter allows adversaries to discover domain accounts associated with a Service Principal Name (SPN). Red Teams and adversaries alike may leverage PowerView and these commandlets to identify accounts that can be attacked with the Kerberoasting technique.
Detection logic
`powershell` EventCode=4104 (ScriptBlockText =*Get-NetUser* OR ScriptBlockText=*Get-DomainUser*) ScriptBlockText= *-SPN*
| 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_spn_discovery_filter`
Windows PowerView Kerberos Service Ticket Request
- source: splunk
- technicques:
- T1558
- T1558.003
Description
The following analytic utilizes PowerShell Script Block Logging (EventCode=4104) to identify the execution of the Get-DomainSPNTicket commandlets with specific parameters. This commandlet is a part of PowerView, a PowerShell tool used to perform enumeration and discovery on Windows Active Directory networks. As the name suggests, this commandlet is used to request the kerberos ticket for a specified service principal name (SPN). Once the ticket is received, it may be cracked using password cracking tools like hashcat to extract the password of the SPN account. Red Teams and adversaries alike may leverage PowerView and these commandlets to identify accounts that can be attacked with the Kerberoasting technique.
Detection logic
`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`