Techniques
Sample rules
Add or Set Windows Defender Exclusion
- source: splunk
- technicques:
- T1562.001
- T1562
Description
This analytic will identify a suspicious process command-line related to Windows Defender exclusion feature. This command is abused by adversaries, malware authors and red teams to bypass Windows Defender Antivirus products by excluding folder path, file path, process and extensions. From its real time or schedule scan to execute their malicious code. This is a good indicator for defense evasion and to look further for events after this behavior.
Detection logic
| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Processes where (Processes.process = "*Add-MpPreference *" OR Processes.process = "*Set-MpPreference *") AND Processes.process="*-exclusion*" by Processes.dest Processes.user Processes.parent_process Processes.parent_process_name 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)`
| `add_or_set_windows_defender_exclusion_filter`