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54 lines
2.5 KiB
YAML
54 lines
2.5 KiB
YAML
name: Clop Common Exec Parameter
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id: 5a8a2a72-8322-11eb-9ee9-acde48001122
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version: 1
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date: '2021-03-17'
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author: Teoderick Contreras, Splunk
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type: batch
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datamodel:
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- Endpoint
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description: The following analytics are designed to identifies some CLOP ransomware
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variant that using arguments to execute its main code or feature of its code. In
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this variant if the parameter is "runrun", CLOP ransomware will try to encrypt files
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in network shares and if it is "temp.dat", it will try to read from some stream
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pipe or file start encrypting files within the infected local machines. This technique
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can be also identified as an anti-sandbox technique to make its code non-responsive
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since it is waiting for some parameter to execute properly.
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search: '| tstats `security_content_summariesonly` values(Processes.process) as cmdline
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values(Processes.parent_process_name) as parent_process values(Processes.process_name)
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count min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Processes
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where Processes.process_name != "*temp.dat*" Processes.process = "*runrun*" OR Processes.process
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= "*temp.dat*" by Processes.parent_process_name Processes.process_name Processes.process
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Processes.dest Processes.user Processes.process_id Processes.process_guid | `drop_dm_object_name(Processes)`
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| `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `clop_common_exec_parameter_filter`'
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how_to_implement: To successfully implement this search, you need to be ingesting
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logs with the process name, parent process, and command-line executions from your
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endpoints. If you are using Sysmon, you must have at least version 6.0.4 of the
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Sysmon TA.
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known_false_positives: Operators can execute third party tools using these parameters.
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references:
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- https://www.fireeye.com/blog/threat-research/2020/10/fin11-email-campaigns-precursor-for-ransomware-data-theft.html
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- https://blog.virustotal.com/2020/11/keep-your-friends-close-keep-ransomware.html
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tags:
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analytic_story:
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- Clop Ransomware
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automated_detection_testing: passed
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dataset:
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- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/clop/clop_b/windows-sysmon.log
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kill_chain_phases:
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- Obfuscation
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mitre_attack_id:
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- T1204
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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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- Processes.process
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- Processes.parent_process_name
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- _time
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- Processes.process_name
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- Processes.dest
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- Processes.user
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- Processes.process_id
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security_domain: endpoint
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