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57 lines
2.6 KiB
YAML
57 lines
2.6 KiB
YAML
name: Detect RClone Command-Line Usage
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id: 32e0baea-b3f1-11eb-a2ce-acde48001122
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version: 1
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date: '2021-05-13'
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author: Michael Haag, Splunk
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type: batch
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datamodel:
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- Endpoint
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description: This analytic identifies commonly used command-line arguments used by
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`rclone.exe` to initiate a file transfer. Some arguments were negated as they are
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specific to the configuration used by adversaries. In particular, an adversary may
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list the files or directories of the remote file share using `ls` or `lsd`, which
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is not indicative of malicious behavior. During triage, at this stage of a ransomware
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event, exfiltration is about to occur or has already. Isolate the endpoint and continue
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investigating by review file modifications and parallel processes.
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search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
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as lastTime from datamodel=Endpoint.Processes where Processes.process IN ("*copy*",
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"*mega*", "*pcloud*", "*ftp*", "*--config*", "*--progress*", "*--no-check-certificate*",
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"*--ignore-existing*", "*--auto-confirm*", "*--transfers*", "*--multi-thread-streams*") by
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Processes.dest Processes.user Processes.parent_process Processes.process_name Processes.process Processes.process_id
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Processes.parent_process_id | `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)` | `detect_rclone_command_line_usage_filter`'
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how_to_implement: To successfully implement this search you need to be ingesting information
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on process that include the name of the process responsible for the changes from
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your endpoints into the `Endpoint` datamodel in the `Processes` node.
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known_false_positives: There is potential for false positives as these arguments may
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be used by other applications. Filter or tune the analytic as needed.
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references:
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- https://redcanary.com/blog/rclone-mega-extortion/
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- https://www.fireeye.com/blog/threat-research/2021/05/shining-a-light-on-darkside-ransomware-operations.html
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- https://thedfirreport.com/2021/03/29/sodinokibi-aka-revil-ransomware/
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tags:
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analytic_story:
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- DarkSide Ransomware
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- Ransomware
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automated_detection_testing: passed
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dataset:
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- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1020/windows-sysmon.log
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kill_chain_phases:
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- Exfiltration
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mitre_attack_id:
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- T1020
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product:
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- Splunk Enterprise
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- Splunk Enterprise Security
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- Splunk Cloud
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required_fields:
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- _time
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- Processes.dest
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- Processes.user
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- Processes.parent_process
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- Processes.process_name
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- Processes.process
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- Processes.process_id
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- Processes.parent_process_id
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security_domain: endpoint
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