Potential Persistence Via Excel Add-in - Registry

 1title: Potential Persistence Via Excel Add-in - Registry
 2id: 961e33d1-4f86-4fcf-80ab-930a708b2f82
 3status: experimental
 4description: Detect potential persistence via the creation of an excel add-in (XLL) file to make it run automatically when Excel is started.
 5references:
 6    - https://github.com/redcanaryco/atomic-red-team/blob/4ae9580a1a8772db87a1b6cdb0d03e5af231e966/atomics/T1137.006/T1137.006.md
 7    - https://labs.withsecure.com/publications/add-in-opportunities-for-office-persistence
 8author: frack113
 9date: 2023/01/15
10modified: 2023/08/17
11tags:
12    - attack.persistence
13    - attack.t1137.006
14logsource:
15    product: windows
16    category: registry_set
17detection:
18    selection:
19        TargetObject|contains: 'Software\Microsoft\Office\'
20        TargetObject|endswith: '\Excel\Options'
21        Details|startswith: '/R '
22        Details|endswith: '.xll'
23    condition: selection
24falsepositives:
25    - Unknown
26level: high

References

• atomic-red-team/atomics/T1137.006/T1137.006.md at 4ae9580a1a8772db87a1b6cdb0d03e5af231e966 · redcanaryco/atomic-red-team

  

  Small and highly portable detection tests based on MITRE's ATT&CK. - redcanaryco/atomic-red-team

  
  Read More

• Add-In Opportunities for Office Persistence

  

  One software product that attackers will almost certainly find in the environments that they're targeting is Microsoft Office. Office applications due to this ubiquity present a consistent source of opportunity for persistence mechanisms.

  
  Read More

Related rules

• Potential Persistence Via Microsoft Office Add-In
• Code Executed Via Office Add-in XLL File
• Add Debugger Entry To AeDebug For Persistence
• Add Debugger Entry To Hangs Key For Persistence
• Bypass UAC Using Event Viewer