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Eric
97 lines
4.9 KiB
YAML
97 lines
4.9 KiB
YAML
name: Detect RClone Command-Line Usage
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id: 32e0baea-b3f1-11eb-a2ce-acde48001122
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version: 11
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date: '2025-05-02'
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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: The following analytic detects the usage of `rclone.exe` with specific
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command-line arguments indicative of file transfer activities. It leverages data
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from Endpoint Detection and Response (EDR) agents, focusing on command-line executions
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and process details. This activity is significant as `rclone.exe` is often used
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by adversaries for data exfiltration, especially during ransomware attacks. If confirmed
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malicious, this behavior could lead to unauthorized data transfer, resulting in
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data breaches and potential loss of sensitive information. Immediate isolation of
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the affected endpoint and further investigation are recommended.
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data_source:
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- Sysmon EventID 1
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- Windows Event Log Security 4688
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- CrowdStrike ProcessRollup2
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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 `process_rclone` Processes.process
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IN ("*copy*", "*mega*", "*pcloud*", "*ftp*", "*--config*", "*--progress*", "*--no-check-certificate*",
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"*--ignore-existing*", "*--auto-confirm*", "*--transfers*", "*--multi-thread-streams*")
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by Processes.action Processes.dest Processes.original_file_name Processes.parent_process
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Processes.parent_process_exec Processes.parent_process_guid Processes.parent_process_id
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Processes.parent_process_name Processes.parent_process_path Processes.process Processes.process_exec
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Processes.process_guid Processes.process_hash Processes.process_id Processes.process_integrity_level
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Processes.process_name Processes.process_path Processes.user Processes.user_id Processes.vendor_product
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| `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`
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| `detect_rclone_command_line_usage_filter`'
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how_to_implement: The detection is based on data that originates from Endpoint Detection
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and Response (EDR) agents. These agents are designed to provide security-related
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telemetry from the endpoints where the agent is installed. To implement this search,
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you must ingest logs that contain the process GUID, process name, and parent process.
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Additionally, you must ingest complete command-line executions. These logs must
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be processed using the appropriate Splunk Technology Add-ons that are specific to
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the EDR product. The logs must also be mapped to the `Processes` node of the `Endpoint`
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data model. Use the Splunk Common Information Model (CIM) to normalize the field
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names and speed up the data modeling process.
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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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drilldown_searches:
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- name: View the detection results for - "$user$" and "$dest$"
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search: '%original_detection_search% | search user = "$user$" dest = "$dest$"'
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earliest_offset: $info_min_time$
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latest_offset: $info_max_time$
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- name: View risk events for the last 7 days for - "$user$" and "$dest$"
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search: '| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$user$",
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"$dest$") starthoursago=168 | stats count min(_time) as firstTime max(_time)
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as lastTime values(search_name) as "Search Name" values(risk_message) as "Risk
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Message" values(analyticstories) as "Analytic Stories" values(annotations._all)
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as "Annotations" values(annotations.mitre_attack.mitre_tactic) as "ATT&CK Tactics"
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by normalized_risk_object | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`'
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earliest_offset: $info_min_time$
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latest_offset: $info_max_time$
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rba:
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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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risk_objects:
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- field: user
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type: user
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score: 35
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- field: dest
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type: system
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score: 35
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threat_objects:
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- field: parent_process_name
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type: parent_process_name
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- field: process_name
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type: process_name
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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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- Black Basta Ransomware
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- Cactus Ransomware
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asset_type: Endpoint
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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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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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