The following analytic leverages Splunks Admon to identify the creation of a new Group Policy Object. With GPOs, system administrators can manage and configure applications, software operations, and user settings throughout an entire organization. GPOs can be abused and leveraged by adversaries to escalate privileges or deploy malware across an Active Directory network. As an example, the Lockbit ransomware malware will create new group policies on the domain controller that are then pushed out to every device on the network. Security teams should monitor the creation of new Group Policy Objects.
- Type: TTP
Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
- Last Updated: 2023-04-06
- Author: Mauricio Velazco, Splunk
- ID: 69201633-30d9-48ef-b1b6-e680805f0582
Kill Chain Phase
- CIS 10
1 2 3 4 5 `admon` admonEventType=Update objectCategory="CN=Group-Policy-Container,CN=Schema,CN=Configuration,DC=*" versionNumber=0 displayName!="New Group Policy Object" | stats min(_time) as firstTime max(_time) as lastTime values(gPCFileSysPath) by dcName, displayName | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `windows_admon_group_policy_object_created_filter`
The SPL above uses the following Macros:
windows_admon_group_policy_object_created_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.
List of fields required to use this analytic.
How To Implement
To successfully implement this search, you need to be monitoring Active Directory logs using Admon. Details can be found here https://docs.splunk.com/Documentation/SplunkCloud/8.1.2101/Data/MonitorActiveDirectory
Known False Positives
Group Policy Objects are created as part of regular administrative operations, filter as needed.
Associated Analytic Story
|50.0||100||50||A new group policy objected was created on $dcName$|
The Risk Score is calculated by the following formula: Risk Score = (Impact * Confidence/100). Initial Confidence and Impact is set by the analytic author.
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