The following analytic identifies a modification in the Windows registry to disable Windows Defender raw write notification feature. This policy controls whether raw volume write notifications are sent to behavior monitoring or not. This registry was recently identified in Azorult malware to bypass Windows Defender detections or behavior monitoring in terms of volume write.
- Type: Anomaly
- Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
- Datamodel: Endpoint
- Last Updated: 2022-06-23
- Author: Teoderick Contreras, Splunk
- ID: 0e5e25c3-32f4-46f7-ba4a-5b95c3b90f5b
Kill Chain Phase
- CIS 10
1 2 3 4 5 6 | tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as lastTime FROM datamodel=Endpoint.Registry where Registry.registry_path= "*\\Windows Defender\\Real-Time Protection\\DisableRawWriteNotification*" Registry.registry_value_data="0x00000001" by Registry.registry_key_name Registry.user Registry.registry_path Registry.registry_value_data Registry.action Registry.dest | `drop_dm_object_name(Registry)` | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `windows_modify_registry_disable_win_defender_raw_write_notif_filter`
The SPL above uses the following Macros:
windows_modify_registry_disable_win_defender_raw_write_notif_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 ingesting information on process that include the name of the process responsible for the changes from your endpoints into the
Endpoint datamodel in the
Registry node. Also make sure that this registry was included in your config files ex. sysmon config to be monitored.
Known False Positives
Administrators may enable or disable this feature that may cause some false positive. Filter as needed.
Associated Analytic Story
|49.0||70||70||The registry for raw write notification settings was modified to disable in $dest$.|
The Risk Score is calculated by the following formula: Risk Score = (Impact * Confidence/100). Initial Confidence and Impact is set by the analytic author.
source | version: 1