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P4T12ICK
84 lines
2.7 KiB
YAML
84 lines
2.7 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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status: production
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type: TTP
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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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data_source:
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- Sysmon Event ID 1
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search:
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selection1:
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ParentImage: excel.exe
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selection2:
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OriginalFileName: pwsh.dll
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selection3:
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Image|endswith:
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- pwsh.exe
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- sqlps.exe
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- sqltoolsps.exe
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- powershell.exe
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- powershell_ise.exe
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selection4:
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OriginalFileName: PowerShell.EXE
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selection5:
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OriginalFileName: powershell_ise.EXE
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condition: selection1 and selection2 and selection3 and selection4 and selection5
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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. In addition,
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confirm the latest CIM App 4.20 or higher is installed and the latest TA for the
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endpoint product.
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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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asset_type: Endpoint
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confidence: 100
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impact: 80
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message: An instance of $parent_process_name$ spawning $process_name$ was identified
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on endpoint $dest$ by user $user$, indicating potential suspicious macro execution.
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mitre_attack_id:
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- T1003.002
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- T1003
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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: parent_process_name
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type: Process
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role:
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- Parent Process
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- name: process_name
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type: Process
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role:
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- Child Process
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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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risk_score: 80
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security_domain: endpoint
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tests:
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- name: True Positive Test
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attack_data:
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- data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1566.001/macro/windows-sysmon.log
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source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
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sourcetype: xmlwineventlog
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