Code Executed Via Office Add-in XLL File

calendar Jan 27, 2023 · attack.persistence attack.t1137.006  ·
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Adversaries may abuse Microsoft Office add-ins to obtain persistence on a compromised system. Office add-ins can be used to add functionality to Office programs

Sigma rule (View on GitHub)

 1title: Code Executed Via Office Add-in XLL File
 2id: 36fbec91-fa1b-4d5d-8df1-8d8edcb632ad
 3status: test
 4description: |
 5    Adversaries may abuse Microsoft Office add-ins to obtain persistence on a compromised system.
 6    Office add-ins can be used to add functionality to Office programs    
 7references:
 8    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1137.006/T1137.006.md
 9author: frack113
10date: 2021/12/28
11tags:
12    - attack.persistence
13    - attack.t1137.006
14logsource:
15    product: windows
16    category: ps_script
17    definition: 'Requirements: Script Block Logging must be enabled'
18detection:
19    selection:
20        ScriptBlockText|contains|all:
21            - 'new-object '
22            - '-ComObject '
23            - '.application'
24            - '.RegisterXLL'
25    condition: selection
26falsepositives:
27    - Unknown
28level: high

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