Techniques
Sample rules
Disabled Kerberos Pre-Authentication Discovery With Get-ADUser
- source: splunk
- technicques:
- T1558
- T1558.004
Description
The following analytic detects the execution of the Get-ADUser PowerShell cmdlet with parameters indicating a search for domain accounts with Kerberos Pre-Authentication disabled. It leverages PowerShell Script Block Logging (EventCode=4104) to identify this specific activity. This behavior is significant because discovering accounts with Kerberos Pre-Authentication disabled can allow adversaries to perform offline password cracking. If confirmed malicious, this activity could lead to unauthorized access to user accounts, potentially compromising sensitive information and escalating privileges within the network.
Detection logic
`powershell` EventCode=4104 (ScriptBlockText = "*Get-ADUser*" AND ScriptBlockText="*4194304*")
| stats count min(_time) as firstTime max(_time) as lastTime by Opcode Computer UserID EventCode ScriptBlockText
| rename Computer as dest
| `security_content_ctime(firstTime)`
| `disabled_kerberos_pre_authentication_discovery_with_get_aduser_filter`