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P4T12ICK
45 lines
1.3 KiB
YAML
45 lines
1.3 KiB
YAML
name: Spike in File Writes
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id: fdb0f805-74e4-4539-8c00-618927333aae
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version: 3
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date: '2020-03-16'
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author: David Dorsey, Splunk
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status: experimental
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type: Anomaly
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description: The search looks for a sharp increase in the number of files written
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to a particular host
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data_source:
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- Sysmon Event ID 11
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search:
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selection1:
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Filesystem.action: created
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condition: selection1
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how_to_implement: In order to implement this search, you must populate the Endpoint
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file-system data model node. This is typically populated via endpoint detection
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and response product, such as Carbon Black or endpoint data sources such as Sysmon.
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The data used for this search is typically generated via logs that report reads
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and writes to the file system.
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known_false_positives: It is important to understand that if you happen to install
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any new applications on your hosts or are copying a large number of files, you can
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expect to see a large increase of file modifications.
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references: []
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tags:
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analytic_story:
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- SamSam Ransomware
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- Ryuk Ransomware
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- Ransomware
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asset_type: Endpoint
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confidence: 50
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impact: 50
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message: tbd
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observable:
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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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product:
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- Splunk Enterprise
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- Splunk Enterprise Security
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- Splunk Cloud
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risk_score: 25
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security_domain: endpoint
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