ClickOnce Trust Prompt Tampering

calendar Oct 23, 2025 · attack.persistence attack.defense-evasion attack.t1112  ·
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Detects changes to the ClickOnce trust prompt registry key in order to enable an installation from different locations such as the Internet.

Sigma rule (View on GitHub)

 1title: ClickOnce Trust Prompt Tampering
 2id: ac9159cc-c364-4304-8f0a-d63fc1a0aabb
 3status: test
 4description: Detects changes to the ClickOnce trust prompt registry key in order to enable an installation from different locations such as the Internet.
 5references:
 6    - https://posts.specterops.io/less-smartscreen-more-caffeine-ab-using-clickonce-for-trusted-code-execution-1446ea8051c5
 7    - https://learn.microsoft.com/en-us/visualstudio/deployment/how-to-configure-the-clickonce-trust-prompt-behavior
 8author: '@SerkinValery, Nasreddine Bencherchali (Nextron Systems)'
 9date: 2023-06-12
10modified: 2023-08-17
11tags:
12    - attack.persistence
13    - attack.defense-evasion
14    - attack.t1112
15logsource:
16    category: registry_set
17    product: windows
18detection:
19    selection:
20        TargetObject|contains: '\SOFTWARE\MICROSOFT\.NETFramework\Security\TrustManager\PromptingLevel\'
21        TargetObject|endswith:
22            - '\Internet'
23            - '\LocalIntranet'
24            - '\MyComputer'
25            - '\TrustedSites'
26            - '\UntrustedSites'
27        Details: 'Enabled'
28    condition: selection
29falsepositives:
30    - Legitimate internal requirements.
31level: medium

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