mirror of
https://github.com/splunk/security_content
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Michael Haag
66 lines
2.6 KiB
YAML
66 lines
2.6 KiB
YAML
name: Windows System File on Disk
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id: 993ce99d-9cdd-42c7-a2cf-733d5954e5a6
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version: 2
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date: '2022-05-16'
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author: Michael Haag, Splunk
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type: Hunting
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datamodel:
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- Endpoint
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description: The following hunting analytic will assist with identifying new .sys files introduced in the environment. This query is meant to identify sys file creates on disk. There will be noise, but reducing common process names or applications should help to limit any volume.
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The idea is to identify new sys files written to disk and identify them before they're added as a new kernel mode driver.
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search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
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as lastTime FROM datamodel=Endpoint.Filesystem where Filesystem.file_name="*.sys*" by _time span=1h Filesystem.dest Filesystem.file_create_time Filesystem.file_name Filesystem.file_path Filesystem.file_hash
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| `drop_dm_object_name(Filesystem)`
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| `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)`| `windows_system_file_on_disk_filter`'
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how_to_implement: To successfully implement this search you need to be ingesting information on files from your endpoints into the `Endpoint` datamodel in the `Filesystem` node. In addition, confirm the latest CIM App 4.20 or higher is installed and the latest TA for the endpoint product.
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In addition, filtering may occur by adding NOT (Filesystem.file_path IN ("*\\Windows\\*", "*\\Program File*", "*\\systemroot\\*","%SystemRoot%*", "system32\*")). This will level out the noise generated to potentally lead to generating notables.
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known_false_positives: False positives will be present. Filter as needed.
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references:
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- https://redcanary.com/blog/tracking-driver-inventory-to-expose-rootkits/
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tags:
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analytic_story:
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- Windows Drivers
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- CISA AA22-264A
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asset_type: Endpoint
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cis20:
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- CIS 3
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- CIS 5
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- CIS 16
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confidence: 50
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context:
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- Source:Endpoint
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- Stage:Persistence
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dataset:
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- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1068/drivers/sysmon_sys_filemod.log
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impact: 20
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kill_chain_phases:
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- Delivery
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message: A new driver is present on $dest$.
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mitre_attack_id:
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- T1068
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nist:
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- DE.CM
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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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required_fields:
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- _time
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- Processes.dest
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- Processes.user
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- Processes.original_file_name
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- Processes.process_name #process name
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- Processes.process #process cmdline
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- Processes.process_id
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- Processes.parent_process_path
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- Processes.process_path
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- Processes.parent_process_id
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risk_score: 10
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security_domain: endpoint
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