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P4T12ICK
89 lines
3.0 KiB
YAML
89 lines
3.0 KiB
YAML
name: Detect RClone Command-Line Usage
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id: 32e0baea-b3f1-11eb-a2ce-acde48001122
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version: 2
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date: '2021-11-29'
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author: Michael Haag, Splunk
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status: production
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type: TTP
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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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data_source:
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- Sysmon Event ID 1
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search:
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selection1:
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Image|endswith: rclone.exe
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selection2:
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OriginalFileName: rclone.exe
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selection3:
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CommandLine:
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- '*copy*'
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- '*mega*'
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- '*pcloud*'
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- '*ftp*'
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- '*--config*'
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- '*--progress*'
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- '*--no-check-certificate*'
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- '*--ignore-existing*'
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- '*--auto-confirm*'
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- '*--transfers*'
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- '*--multi-thread-streams*'
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condition: (selection1 or selection2) and selection3
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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. In addition,
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confirm the latest CIM App 4.20 or higher is installed and the latest TA for the
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endpoint product.
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known_false_positives: False positives should be limited as this is restricted to
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the Rclone process name. 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.mandiant.com/resources/shining-a-light-on-darkside-ransomware-operations
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- https://thedfirreport.com/2021/03/29/sodinokibi-aka-revil-ransomware/
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- https://thedfirreport.com/2021/11/29/continuing-the-bazar-ransomware-story/
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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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asset_type: Endpoint
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confidence: 70
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impact: 50
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message: An instance of $parent_process_name$ spawning $process_name$ was identified
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on endpoint $dest$ by user $user$ attempting to connect to a remote cloud service
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to move files or folders.
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mitre_attack_id:
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- T1020
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observable:
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- name: user
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type: User
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role:
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- Victim
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- name: dest
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type: Hostname
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role:
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- Victim
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- name: parent_process_name
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type: Process
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role:
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- Parent Process
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- name: process_name
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type: Process
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role:
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- Child Process
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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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risk_score: 35
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security_domain: endpoint
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tests:
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- name: True Positive Test
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attack_data:
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- data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1020/windows-sysmon.log
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source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
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sourcetype: xmlwineventlog
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