Techniques
Sample rules
Windows Privileged Group Modification
- source: splunk
- technicques:
- T1136.001
- T1136.002
Description
This analytic detects modifications to privileged groups in Active Directory, including creation, deletion, and changes to various types of groups such as local, global, universal, and LDAP query groups. It specifically monitors for changes to high-privilege groups like “Administrators”, “Domain Admins”, “Enterprise Admins”, and “ESX Admins”, among others. This detection is particularly relevant in the context of potential exploitation of vulnerabilities like the VMware ESXi Active Directory Integration Authentication Bypass (CVE-2024-37085), where attackers may attempt to manipulate privileged groups to gain unauthorized access to systems.
Detection logic
`wineventlog_security` EventCode IN (4727,4731,4744,4749,4754,4759,4783,4790) TargetUserName IN ("Account Operators", "Administrators", "Admins DNS", "Backup Operators", "DnsAdmins", "Domain Admins", "Enterprise Admins", "Enterprise Key Admins", "ESX Admins", "ESXi Admins", "Group Policy Creator Owners", "Hyper-V Administrators", "Key Admins", "Print Operators", "Remote Desktop Users", "Remote Management Users", "Replicators", "Schema Admins", "Server Operators")
| eval object_category=case( EventCode="4731", "Local Group (Security)", EventCode="4744", "Local Group (Distribution)", EventCode="4727", "Global Group (Security)", EventCode="4749", "Global Group (Distribution)", EventCode="4754", "Universal Group (Security)", EventCode="4759", "Universal Group (Distribution)", EventCode="4783", "Basic Application Group", EventCode="4790", "LDAP Query Group")
| rename Computer as dest, result AS change_type, TargetUserName AS object, TargetSid AS object_path
| stats count min(_time) as firstTime max(_time) as lastTime by EventCode src_user object_category object object_path dest change_type status
| `windows_privileged_group_modification_filter`