Techniques
Sample rules
Revil Common Exec Parameter
- source: splunk
- technicques:
- T1204
Description
The following analytic detects the execution of command-line parameters commonly associated with REVIL ransomware, such as “-nolan”, “-nolocal”, “-fast”, and “-full”. It leverages data from Endpoint Detection and Response (EDR) agents, focusing on process execution logs mapped to the Processes node of the Endpoint data model. This activity is significant because these parameters are indicative of ransomware attempting to encrypt files on a compromised machine. If confirmed malicious, this could lead to widespread data encryption, rendering critical files inaccessible and potentially causing significant operational disruption.
Detection logic
| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as lastTime FROM datamodel=Endpoint.Processes
WHERE Processes.process = "* -nolan *"
OR
Processes.process = "* -nolocal *"
OR
Processes.process = "* -fast *"
OR
Processes.process = "* -full *"
BY Processes.action Processes.dest Processes.original_file_name
Processes.parent_process Processes.parent_process_exec Processes.parent_process_guid
Processes.parent_process_id Processes.parent_process_name Processes.parent_process_path
Processes.process Processes.process_exec Processes.process_guid
Processes.process_hash Processes.process_id Processes.process_integrity_level
Processes.process_name Processes.process_path Processes.user
Processes.user_id Processes.vendor_product
| `drop_dm_object_name(Processes)`
| `security_content_ctime(firstTime)`
| `security_content_ctime(lastTime)`
| `revil_common_exec_parameter_filter`