Trust Access Disable For VBApplications

calendar Aug 17, 2023 · attack.defense_evasion attack.t1112  ·
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Detects registry changes to Microsoft Office "AccessVBOM" to a value of "1" which disables trust access for VBA on the victim machine and lets attackers execute malicious macros without any Microsoft Office warnings.

Sigma rule (View on GitHub)

 1title: Trust Access Disable For VBApplications
 2id: 1a5c46e9-f32f-42f7-b2bc-6e9084db7fbf
 3related:
 4    - id: a166f74e-bf44-409d-b9ba-ea4b2dd8b3cd
 5      type: obsoletes
 6status: test
 7description: Detects registry changes to Microsoft Office "AccessVBOM" to a value of "1" which disables trust access for VBA on the victim machine and lets attackers execute malicious macros without any Microsoft Office warnings.
 8references:
 9    - https://twitter.com/inversecos/status/1494174785621819397
10    - https://www.mcafee.com/blogs/other-blogs/mcafee-labs/zloader-with-a-new-infection-technique/
11    - https://securelist.com/scarcruft-surveilling-north-korean-defectors-and-human-rights-activists/105074/
12author: Trent Liffick (@tliffick), Nasreddine Bencherchali (Nextron Systems)
13date: 2020/05/22
14modified: 2023/08/17
15tags:
16    - attack.defense_evasion
17    - attack.t1112
18logsource:
19    category: registry_set
20    product: windows
21detection:
22    selection:
23        TargetObject|endswith: '\Security\AccessVBOM'
24        Details: 'DWORD (0x00000001)'
25    condition: selection
26falsepositives:
27    - Unlikely
28level: high

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