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55 lines
2.5 KiB
YAML
55 lines
2.5 KiB
YAML
name: Winword Spawning Windows Script Host
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id: 637e1b5c-9be1-11eb-9c32-acde48001122
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version: 1
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date: '2021-04-12'
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author: Michael Haag, Splunk
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type: batch
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datamodel:
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- Endpoint
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description: The following detection identifies Microsoft Winword.exe spawning Windows
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Script Host - `cscript.exe` or `wscript.exe`. Typically, this is not common behavior
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and not default with Winword.exe. Winword.exe will generally be found in the following
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path `C:\Program Files\Microsoft Office\root\Office16` (version will vary). `cscript.exe`
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or `wscript.exe` default location is `c:\windows\system32\` or c:windows\syswow64\`.
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`cscript.exe` or `wscript.exe` spawning from Winword.exe is common for a spearphishing
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attachment and is actively used. Albeit, the command-line executed will most likely
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be obfuscated and captured via another detection. During triage, review parallel
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processes and identify any files that may have been written. Review the reputation
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of the remote destination and block accordingly.
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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.Processes where Processes.parent_process_name="winword.exe"
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Processes.process_name IN ("cscript.exe", "wscript.exe") by Processes.dest Processes.user
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Processes.parent_process Processes.process_name Processes.process Processes.process_id
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Processes.parent_process_id | `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)` | `winword_spawning_windows_script_host_filter`'
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how_to_implement: To successfully implement this search you need to be ingesting information
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on process that include the name of the process responsible for the changes from
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your endpoints into the `Endpoint` datamodel in the `Processes` node.
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known_false_positives: There will be limited false positives and it will be different
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for every environment. Tune by child process or command-line as needed.
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references:
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- https://attack.mitre.org/techniques/T1566/001/
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tags:
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analytic_story:
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- Spearphishing Attachment
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automated_detection_testing: passed
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dataset:
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- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1566.001/macro/windows-sysmon_wsh.log
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kill_chain_phases:
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- Exploitation
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mitre_attack_id:
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- T1566.001
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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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- process_name
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- process_id
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- parent_process_name
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- dest
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- user
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- parent_process_id
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security_domain: endpoint
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