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53 lines
2.2 KiB
YAML
53 lines
2.2 KiB
YAML
name: Excel Spawning PowerShell
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id: 42d40a22-9be3-11eb-8f08-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 Excel spawning PowerShell.
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Typically, this is not common behavior and not default with Excel.exe. Excel.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 Excel.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 values(Processes.process)
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min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Processes
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where Processes.parent_process_name="excel.exe" Processes.process_name IN ("powershell.exe",
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"pwsh.exe") by Processes.parent_process Processes.process_name Processes.user Processes.dest
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| `drop_dm_object_name("Processes")` | `security_content_ctime(firstTime)`|`security_content_ctime(lastTime)`
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| `excel_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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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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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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kill_chain_phases:
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- Exploitation
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mitre_attack_id:
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- T1003.002
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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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