mirror of
https://github.com/splunk/security_content
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Bhavin Patel
92 lines
3.6 KiB
YAML
92 lines
3.6 KiB
YAML
name: Conti Common Exec parameter
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id: 624919bc-c382-11eb-adcc-acde48001122
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version: 2
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date: '2024-05-21'
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author: Teoderick Contreras, Splunk
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status: production
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type: TTP
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description: The following analytic detects the execution of suspicious command-line
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arguments commonly associated with Conti ransomware, specifically targeting local
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drives and network shares for encryption. It leverages data from Endpoint Detection
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and Response (EDR) agents, focusing on process execution logs that include command-line
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details. This activity is significant because it indicates a potential ransomware
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attack, which can lead to widespread data encryption and operational disruption.
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If confirmed malicious, the impact could be severe, resulting in data loss, system
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downtime, and potential ransom demands.
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data_source:
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- Sysmon EventID 1
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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 = "*-m local*"
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OR Processes.process = "*-m net*" OR Processes.process = "*-m all*" OR Processes.process
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= "*-nomutex*" by Processes.process_name Processes.process Processes.parent_process_name
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Processes.parent_process Processes.dest Processes.user Processes.process_id Processes.process_guid
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| `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`
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| `conti_common_exec_parameter_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: 3rd party tool may have commandline parameter that can trigger
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this detection.
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references:
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- https://malpedia.caad.fkie.fraunhofer.de/details/win.conti
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tags:
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analytic_story:
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- Ransomware
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asset_type: Endpoint
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confidence: 80
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impact: 80
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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 $user$ executing specific Conti Ransomware related
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parameters.
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mitre_attack_id:
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- T1204
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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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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_name
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- Processes.parent_process
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- Processes.original_file_name
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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_path
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- Processes.process_path
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- Processes.parent_process_id
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risk_score: 64
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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:
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https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/conti/inf1/windows-sysmon.log
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source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
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sourcetype: xmlwineventlog
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