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pyth0n1c
95 lines
4.0 KiB
YAML
95 lines
4.0 KiB
YAML
name: Detect RClone Command-Line Usage
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id: e8b74268-5454-11ec-a799-acde48001122
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version: 1
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date: '2021-12-03'
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author: Michael Haag, Splunk
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type: TTP
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datamodel:
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- Endpoint_Processes
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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: '| from read_ssa_enriched_events() | where "Endpoint_Processes" IN(_datamodels)
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| eval timestamp=parse_long(ucast(map_get(input_event, "_time"), "string", null)),
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cmd_line=ucast(map_get(input_event, "process"), "string", null), process_name=ucast(map_get(input_event,
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"process_name"), "string", null), process_path=ucast(map_get(input_event, "process_path"),
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"string", null), parent_process_name=ucast(map_get(input_event, "parent_process_name"),
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"string", null), event_id=ucast(map_get(input_event, "event_id"), "string", null)
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| where cmd_line IS NOT NULL AND process_name IS NOT NULL AND process_name="rclone.exe"
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AND (like (cmd_line, "%copy%") OR like (cmd_line, "%mega%")OR like (cmd_line, "%pcloud%")
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OR like (cmd_line, "%ftp%") OR like (cmd_line, "%--config%") OR like (cmd_line,
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"%--progress%") OR like (cmd_line, "%--no-check-certificate%") OR like (cmd_line,
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"%--ignore-existing%") OR like (cmd_line, "%--auto-confirm%") OR like (cmd_line,
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"%--transfers%") OR like (cmd_line, "%--multi-thread-streams%")) | eval start_time=timestamp,
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end_time=timestamp, entities=mvappend(ucast(map_get(input_event, "dest_user_id"),
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"string", null), ucast(map_get(input_event, "dest_device_id"), "string", null))
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| eval body=create_map(["event_id", event_id, "cmd_line", cmd_line, "process_name",
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process_name, "parent_process_name", parent_process_name, "process_path", process_path])
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| into write_ssa_detected_events();'
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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_Processess` datamodel.
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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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cis20: []
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confidence: 70
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context:
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- Source:Endpoint
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- Stage:Exfiltration
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dataset:
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- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1020/windows-security.log
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impact: 50
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kill_chain_phases:
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- Exploitation
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message: An instance of $parent_process_name$ spawning $process_name$ was identified
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on endpoint $dest_device_id$ by user $dest_user_id$ attempting to connect to a
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remote cloud service to move files or folders.
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mitre_attack_id:
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- T1020
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nist: []
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observable:
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- name: dest_user_id
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type: User
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role:
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- Victim
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- name: dest_device_id
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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 Behavioral Analytics
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required_fields:
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- _time
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- dest_device_id
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- process_name
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- parent_process_name
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- process_path
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- dest_user_id
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- process
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- cmd_line
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risk_score: 35
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risk_severity: low
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security_domain: endpoint
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asset_type: Endpoint
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