Detect RClone Command-Line Usage
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
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.
- Type: TTP
- Product: Splunk Behavioral Analytics
- Datamodel: Endpoint_Processes
- Last Updated: 2021-12-03
- Author: Michael Haag, Splunk
- ID: e8b74268-5454-11ec-a799-acde48001122
Kill Chain Phase
1 2 3 4 5 6 7 8 | from read_ssa_enriched_events() | where "Endpoint_Processes" IN(_datamodels) | eval timestamp=parse_long(ucast(map_get(input_event, "_time"), "string", null)), cmd_line=ucast(map_get(input_event, "process"), "string", null), process_name=ucast(map_get(input_event, "process_name"), "string", null), process_path=ucast(map_get(input_event, "process_path"), "string", null), parent_process_name=ucast(map_get(input_event, "parent_process_name"), "string", null), event_id=ucast(map_get(input_event, "event_id"), "string", null) | where cmd_line IS NOT NULL AND process_name IS NOT NULL AND process_name="rclone.exe" AND (like (cmd_line, "%copy%") OR like (cmd_line, "%mega%")OR like (cmd_line, "%pcloud%") OR like (cmd_line, "%ftp%") OR like (cmd_line, "%--config%") OR like (cmd_line, "%--progress%") OR like (cmd_line, "%--no-check-certificate%") OR like (cmd_line, "%--ignore-existing%") OR like (cmd_line, "%--auto-confirm%") OR like (cmd_line, "%--transfers%") OR like (cmd_line, "%--multi-thread-streams%")) | eval start_time=timestamp, end_time=timestamp, entities=mvappend(ucast(map_get(input_event, "dest_user_id"), "string", null), ucast(map_get(input_event, "dest_device_id"), "string", null)) | eval body=create_map(["event_id", event_id, "cmd_line", cmd_line, "process_name", process_name, "parent_process_name", parent_process_name, "process_path", process_path]) | into write_ssa_detected_events();
The SPL above uses the following Macros:
detect_rclone_command-line_usage_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.
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
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
|35.0||50||70||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.|
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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