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P4T12ICK
77 lines
2.6 KiB
YAML
77 lines
2.6 KiB
YAML
name: Batch File Write to System32
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id: 503d17cb-9eab-4cf8-a20e-01d5c6987ae3
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version: 1
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date: '2018-12-14'
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author: Rico Valdez, Splunk
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type: TTP
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datamodel:
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- Endpoint
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description: The search looks for a batch file (.bat) written to the Windows system
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directory tree.
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search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
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as lastTime values(Filesystem.dest) as dest values(Filesystem.file_name) as file_name
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values(Filesystem.user) as user from datamodel=Endpoint.Filesystem by Filesystem.file_path
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| `drop_dm_object_name(Filesystem)` | `security_content_ctime(lastTime)` | `security_content_ctime(firstTime)`|
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rex field=file_name "(?<file_extension>\.[^\.]+)$" | search file_path=*system32*
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AND file_extension=.bat | `batch_file_write_to_system32_filter`'
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how_to_implement: You must be ingesting data that records the file-system activity
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from your hosts to populate the Endpoint file-system data-model node. If you are
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using Sysmon, you will need a Splunk Universal Forwarder on each endpoint from which
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you want to collect data.
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known_false_positives: It is possible for this search to generate a notable event
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for a batch file write to a path that includes the string "system32", but is not
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the actual Windows system directory. As such, you should confirm the path of the
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batch file identified by the search. In addition, a false positive may be generated
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by an administrator copying a legitimate batch file in this directory tree. You
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should confirm that the activity is legitimate and modify the search to add exclusions,
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as necessary.
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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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asset_type: Endpoint
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automated_detection_testing: passed
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cis20:
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- CIS 8
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confidence: 90
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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/attack_techniques/T1204.002/batch_file_in_system32/windows-sysmon.log
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impact: 70
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kill_chain_phases:
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- Delivery
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message: A file - $file_name$ was written to system32 has occurred on endpoint $dest$
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by user $user$.
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mitre_attack_id:
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- T1204.002
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nist:
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- PR.PT
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- DE.CM
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observable:
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- name: user
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type: User
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role:
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- Victim
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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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- name: file_name
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type: File Name
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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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- Filesystem.dest
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- Filesystem.file_name
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- Filesystem.user
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- Filesystem.file_path
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risk_score: 63
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security_domain: endpoint
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