Potential Excel.EXE DCOM Lateral Movement Via ActivateMicrosoftApp

Title: Potential Excel.EXE DCOM Lateral Movement Via ActivateMicrosoftApp
Status: test
Description:Detects suspicious child processes of Excel which could be an indicator of lateral movement leveraging the "ActivateMicrosoftApp" Excel DCOM object.
References:
  -https://posts.specterops.io/lateral-movement-abuse-the-power-of-dcom-excel-application-3c016d0d9922
  -https://github.com/grayhatkiller/SharpExShell
  -https://learn.microsoft.com/en-us/office/vba/api/excel.xlmsapplication
Author: Aaron Stratton
Date: 2023-11-13
modified:None
Tags:

• -'attack.t1021.003'
• -'attack.lateral-movement'

Logsource:

• category: process_creation
• product: windows

Detection:
  selection_parent:
    ParentImage|endswith: '\excel.exe'
  selection_child:
    - OriginalFileName:
      - 'foxprow.exe'
      - 'schdplus.exe'
      - 'winproj.exe'
    - Image|endswith:
      - '\foxprow.exe'
      - '\schdplus.exe'
      - '\winproj.exe'
  condition:all of selection_*
Falsepositives:
  -Unknown
Level: high