The following analytic identifies a suspicious registry modification of Windows long path enable configuration. This technique was being abused by several adversaries, malware like BlackByte to enable long file path support in the operating system. By default, Windows has a limitation on the maximum length of a file path, which is set to 260 characters. Enabling the LongPathsEnabled setting allows you to work with file paths longer than 260 characters.
- Type: Anomaly
- Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
- Datamodel: Endpoint
- Last Updated: 2023-07-10
- Author: Teoderick Contreras, Splunk
- ID: 36f9626c-4272-4808-aadd-267acce681c0
Kill Chain Phase
- CIS 10
1 2 3 4 5 6 | tstats `security_content_summariesonly` count FROM datamodel=Endpoint.Registry WHERE (Registry.registry_path= "*\\CurrentControlSet\\Control\\FileSystem\\LongPathsEnabled" Registry.registry_value_data = "0x00000001") BY _time span=1h Registry.registry_path Registry.registry_key_name Registry.registry_value_name Registry.registry_value_data Registry.process_guid Registry.dest | `drop_dm_object_name(Registry)` | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `windows_modify_registry_longpathsenabled_filter`
The SPL above uses the following Macros:
windows_modify_registry_longpathsenabled_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.
Associated Analytic Story
|16.0||40||40||A registry modification in Windows LongPathEnable configuration on $dest$|
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