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P4T12ICK
76 lines
2.8 KiB
YAML
76 lines
2.8 KiB
YAML
name: Winword Spawning PowerShell
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id: b2c950b8-9be2-11eb-8658-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: TTP
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datamodel:
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- Endpoint
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description: The following detection identifies Microsoft Word spawning PowerShell.
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Typically, this is not common behavior and not default with winword.exe. Winword.exe
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will generally be found in the following path `C:\Program Files\Microsoft Office\root\Office16`
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(version will vary). PowerShell spawning from winword.exe is common for a spearphishing
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attachment and is actively used. Albeit, the command executed will most likely be
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encoded and captured via another detection. During triage, review parallel processes
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and identify any files that may have been written.
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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 ("powershell.exe", "pwsh.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_powershell_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: False positives should be limited, but if any are present,
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filter as needed.
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references:
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- https://redcanary.com/threat-detection-report/techniques/powershell/
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- https://attack.mitre.org/techniques/T1566/001/
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- https://app.any.run/tasks/b79fa381-f35c-4b3e-8d02-507e7ee7342f/
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- https://app.any.run/tasks/181ac90b-0898-4631-8701-b778a30610ad/
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tags:
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analytic_story:
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- Spearphishing Attachments
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automated_detection_testing: passed
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confidence: 100
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context:
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- Source:Endpoint
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- Stage:Initial Access
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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.log
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impact: 70
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kill_chain_phases:
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- Exploitation
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message: '$parent_process_name$ on $dest$ by $user$ launched the following powershell
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process: $process_name$ which is very common in spearphishing attacks'
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mitre_attack_id:
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- T1566.001
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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: user
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type: User
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role:
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- Victim
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- name: process_name
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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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- _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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risk_score: 70
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security_domain: endpoint
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