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tccontre
59 lines
2.2 KiB
YAML
59 lines
2.2 KiB
YAML
name: High Process Termination Frequency
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id: 17cd75b2-8666-11eb-9ab4-acde48001122
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version: 2
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date: '2022-09-14'
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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 analytic is designed to identify a high frequency of process
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termination events on a computer in a short period of time, which is a common behavior of ransomware malware before encrypting files. This technique is designed to avoid an exception error while accessing (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 _time 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 logs with the Image (process full path of terminated process) from your endpoints. 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.mandiant.com/resources/fin11-email-campaigns-precursor-for-ransomware-data-theft
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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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- LockBit Ransomware
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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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asset_type: Endpoint
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