This analytic is to look for process commandline that contains named pipe. This technique was seen in some adversaries, threat actor and malware like olympic destroyer to communicate to its other child processes after process injection that serve as defense evasion and privilege escalation. On the other hand this analytic may catch some normal process that using this technique for example browser application. In that scenario we include common process path we’ve seen during testing that cause false positive which is the program files. False positive may still be arise if the normal application is in other folder path.
- Type: Anomaly
- Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
- Datamodel: Endpoint
- Last Updated: 2022-02-23
- Author: Teoderick Contreras, Splunk
- ID: e64399d4-94a8-11ec-a9da-acde48001122
|T1055||Process Injection||Defense Evasion, Privilege Escalation|
Kill Chain Phase
- CIS 3
- CIS 5
- CIS 16
1 2 3 4 5 6 | tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Processes where Processes.process = "*\\\\.\\pipe\\*" NOT (Processes.process_path IN ("*\\program files*")) by Processes.parent_process_name Processes.parent_process Processes.process_name Processes.process Processes.original_file_name Processes.process_id Processes.parent_process_path Processes.process_guid Processes.parent_process_id Processes.dest Processes.user Processes.process_path | `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `windows_process_with_namedpipe_commandline_filter`
The SPL above uses the following Macros:
Note that windows_process_with_namedpipe_commandline_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.
How To Implement
To successfully implement this search, you need to be ingesting logs with the process name, parent process, and command-line executions from your endpoints. If you are using Sysmon, you must have at least version 6.0.4 of the Sysmon TA.
Known False Positives
Normal browser application may use this technique. Please update the filter macros to remove false positives.
Associated Analytic story
|49.0||70||70||Process with named pipe in $process$ on $dest$|
source | version: 1