Potential Persistence Via Outlook Form

calendar Aug 12, 2024 · attack.persistence attack.t1137.003  ·
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Detects the creation of a new Outlook form which can contain malicious code

Sigma rule (View on GitHub)

 1title: Potential Persistence Via Outlook Form
 2id: c3edc6a5-d9d4-48d8-930e-aab518390917
 3status: test
 4description: Detects the creation of a new Outlook form which can contain malicious code
 5references:
 6    - https://speakerdeck.com/heirhabarov/hunting-for-persistence-via-microsoft-exchange-server-or-outlook?slide=76
 7    - https://speakerdeck.com/heirhabarov/hunting-for-persistence-via-microsoft-exchange-server-or-outlook?slide=79
 8    - https://learn.microsoft.com/en-us/office/vba/outlook/concepts/outlook-forms/create-an-outlook-form
 9    - https://www.slipstick.com/developer/custom-form/clean-outlooks-forms-cache/
10author: Tobias Michalski (Nextron Systems)
11date: 2021-06-10
12modified: 2023-02-22
13tags:
14    - attack.persistence
15    - attack.t1137.003
16logsource:
17    product: windows
18    category: file_event
19detection:
20    selection:
21        Image|endswith: '\outlook.exe'
22        TargetFilename|contains:
23            - '\AppData\Local\Microsoft\FORMS\IPM'
24            - '\Local Settings\Application Data\Microsoft\Forms' # Windows XP
25    condition: selection
26falsepositives:
27    - Legitimate use of outlook forms
28level: high

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