Detection: Detect RClone Command-Line Usage
Description
This analytic identifies commonly used command-line arguments used by rclone.exe to initiate a file transfer. Some arguments were negated as they are specific to the configuration used by adversaries. In particular, an adversary may list the files or directories of the remote file share using ls or lsd, which is not indicative of malicious behavior. During triage, at this stage of a ransomware event, exfiltration is about to occur or has already. Isolate the endpoint and continue investigating by review file modifications and parallel processes.
Annotations
No annotations available.
Implementation
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_Processess datamodel.
Known False Positives
False positives should be limited as this is restricted to the Rclone process name. Filter or tune the analytic as needed.
Associated Analytic Story
Risk Based Analytics (RBA)
| Risk Message | Risk Score | Impact | Confidence |
|---|---|---|---|
| An instance of $parent_process_name$ spawning $process_name$ was identified on endpoint $dest_device_id$ by user $dest_user_id$ attempting to connect to a remote cloud service to move files or folders. | 35 | 50 | 70 |
References
-
https://www.mandiant.com/resources/shining-a-light-on-darkside-ransomware-operations
-
https://thedfirreport.com/2021/03/29/sodinokibi-aka-revil-ransomware/
-
https://thedfirreport.com/2021/11/29/continuing-the-bazar-ransomware-story/
Version: 4