The following analytic identifies Windows commandline to logoff a windows host machine. This technique was seen in several APT, RAT like dcrat and other commodity malware to shutdown the machine to add more impact, interrupt access, aid destruction of the system like wiping disk or inhibit system recovery. This TTP is a good pivot to check why application trigger this commandline which is not so common way to logoff a machine.
- Type: Anomaly
- Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
- Datamodel: Endpoint
- Last Updated: 2022-07-27
- Author: Teoderick Contreras, Splunk
- ID: 74a8133f-93e7-4b71-9bd3-13a66124fd57
Kill Chain Phase
- CIS 3
- CIS 5
- CIS 16
1 2 3 4 5 6 | tstats `security_content_summariesonly` values(Processes.process) as process min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Processes where (Processes.process_name = shutdown.exe OR Processes.original_file_name = shutdown.exe) Processes.process="*shutdown*" Processes.process="* /l*" Processes.process="* /t*" by Processes.dest Processes.user Processes.parent_process Processes.process_name Processes.original_file_name Processes.process Processes.process_id Processes.parent_process_id | `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `windows_system_logoff_commandline_filter`
The SPL above uses the following Macros:
windows_system_logoff_commandline_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.
Supported Add-on (TA)
List of Splunk Add-on’s tested to work with the analytic.
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
Processes node. In addition, confirm the latest CIM App 4.20 or higher is installed and the latest TA for the endpoint product.
Known False Positives
Administrator may execute this commandline to trigger shutdown, logoff or restart the host machine.
Associated Analytic Story
|56.0||70||80||Process name $process_name$ is seen to execute logoff commandline 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.
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