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P4T12ICK
62 lines
2.1 KiB
YAML
62 lines
2.1 KiB
YAML
name: High Process Termination Frequency
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id: 17cd75b2-8666-11eb-9ab4-acde48001122
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version: 1
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date: '2021-03-16'
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author: Teoderick Contreras
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type: Anomaly
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datamodel:
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- Endpoint
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description: This analytics are designed to indentify a high frequency of process
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termination on a machine which is a common behavior of ransomware malware before
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encrypting files. This technique is designed to avoid an exception error while accessing
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(docs, images, database and etc..) in the infected machine for encryption.
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search: '`sysmon` EventCode=5 |bin _time span=3s |stats values(Image) as proc_terminated
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min(_time) as firstTime max(_time) as lastTime count by Computer EventCode ProcessID
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| where count >= 15 | `security_content_ctime(firstTime)`| `security_content_ctime(lastTime)`
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| `high_process_termination_frequency_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 Image (process full path of terminated process) from your endpoints.
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If you are using Sysmon, you must have at least version 6.0.4 of the Sysmon TA.
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known_false_positives: admin or user tool that can terminate multiple process.
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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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confidence: 80
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context:
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- Source:Endpoint
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- Stage:Execution
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dataset:
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- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/clop/clop_a/windows-sysmon.log
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impact: 90
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kill_chain_phases:
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- Exploitation
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message: High frequency process termination (more than 15 processes within 3s) detected
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on host $Computer$
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mitre_attack_id:
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- T1486
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observable:
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- name: Computer
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type: Endpoint
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role:
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- Victim
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- name: proc_terminated
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type: Process
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role:
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- Target
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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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- EventCode
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- Image
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- Computer
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- _time
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- ProcessID
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risk_score: 72
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security_domain: endpoint
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