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P4T12ICK
73 lines
2.5 KiB
YAML
73 lines
2.5 KiB
YAML
name: Detect Renamed RClone
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id: 6dca1124-b3ec-11eb-9328-acde48001122
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version: 2
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date: '2021-09-16'
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author: Michael Haag, Splunk
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status: production
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type: Hunting
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description: The following analytic identifies the usage of `rclone.exe`, renamed,
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being used to exfiltrate data to a remote destination. RClone has been used by multiple
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ransomware groups to exfiltrate data. In many instances, it will be downloaded from
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the legitimate site and executed accordingly. During triage, isolate the endpoint
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and begin to review parallel processes for additional behavior. At this stage, the
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adversary may have staged data to be exfiltrated.
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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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OriginalFileName: rclone.exe
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condition: (selection1)
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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 analytic identifies
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renamed instances of `rclone.exe`. Filter as needed if there is a legitimate business
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use case.
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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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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: 90
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impact: 30
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message: The following $process_name$ has been identified as renamed, spawning from
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$parent_process_name$ on $dest$ by $user$.
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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: 27
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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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