mirror of
https://github.com/splunk/security_content
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Bhavin Patel
70 lines
2.5 KiB
YAML
70 lines
2.5 KiB
YAML
name: High Process Termination Frequency
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id: 17cd75b2-8666-11eb-9ab4-acde48001122
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version: 3
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date: '2024-05-12'
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author: Teoderick Contreras
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status: production
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type: Anomaly
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description: The following analytic identifies a high frequency of process termination
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events on a computer within a short period. It leverages Sysmon EventCode 5 logs
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to detect instances where 15 or more processes are terminated within a 3-second
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window. This behavior is significant as it is commonly associated with ransomware
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attempting to avoid exceptions during file encryption. If confirmed malicious, this
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activity could indicate an active ransomware attack, potentially leading to widespread
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file encryption and significant data loss.
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data_source:
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- Sysmon EventID 5
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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 dest 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.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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- BlackByte Ransomware
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- Rhysida Ransomware
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- Snake Keylogger
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asset_type: Endpoint
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confidence: 80
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impact: 90
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message: High frequency process termination (more than 15 processes within 3s) detected
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on host $dest$
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mitre_attack_id:
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- T1486
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observable:
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- name: dest
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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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- dest
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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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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/clop/clop_a/windows-sysmon.log
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source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
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sourcetype: xmlwineventlog
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