AddinUtil.EXE Execution From Uncommon Directory

 1title: AddinUtil.EXE Execution From Uncommon Directory
 2id: 6120ac2a-a34b-42c0-a9bd-1fb9f459f348
 3status: test
 4description: Detects execution of the Add-In deployment cache updating utility (AddInutil.exe) from a non-standard directory.
 5references:
 6    - https://www.blue-prints.blog/content/blog/posts/lolbin/addinutil-lolbas.html
 7author: Michael McKinley (@McKinleyMike), Tony Latteri (@TheLatteri)
 8date: 2023-09-18
 9modified: 2025-02-24
10tags:
11    - attack.defense-evasion
12    - attack.t1218
13logsource:
14    category: process_creation
15    product: windows
16detection:
17    selection:
18        - Image|endswith: '\addinutil.exe'
19        - OriginalFileName: 'AddInUtil.exe'
20    filter_main_legit_location:
21        Image|contains:
22            - ':\Windows\Microsoft.NET\Framework\'
23            - ':\Windows\Microsoft.NET\Framework64\'
24            - ':\Windows\Microsoft.NET\FrameworkArm\'
25            - ':\Windows\Microsoft.NET\FrameworkArm64\'
26            - ':\Windows\WinSxS\'
27    condition: selection and not 1 of filter_main_*
28falsepositives:
29    - Unknown
30level: medium