Potential Attachment Manager Settings Associations Tamper

calendar Aug 12, 2024 · attack.defense-evasion  ·
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Detects tampering with attachment manager settings policies associations to lower the default file type risks (See reference for more information)

Sigma rule (View on GitHub)

 1title: Potential Attachment Manager Settings Associations Tamper
 2id: a9b6c011-ab69-4ddb-bc0a-c4f21c80ec47
 3status: test
 4description: Detects tampering with attachment manager settings policies associations to lower the default file type risks (See reference for more information)
 5references:
 6    - https://support.microsoft.com/en-us/topic/information-about-the-attachment-manager-in-microsoft-windows-c48a4dcd-8de5-2af5-ee9b-cd795ae42738
 7    - https://www.virustotal.com/gui/file/2bcd5702a7565952c44075ac6fb946c7780526640d1264f692c7664c02c68465
 8author: Nasreddine Bencherchali (Nextron Systems)
 9date: 2022-08-01
10modified: 2023-08-17
11tags:
12    - attack.defense-evasion
13logsource:
14    category: registry_set
15    product: windows
16detection:
17    selection_main:
18        TargetObject|contains: '\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Associations\'
19    selection_value_default_file_type_rsik:
20        TargetObject|endswith: '\DefaultFileTypeRisk'
21        Details: 'DWORD (0x00006152)'
22    selection_value_low_risk_filetypes:
23        TargetObject|endswith: '\LowRiskFileTypes'
24        Details|contains: # Add more as you see fit
25            - '.zip;'
26            - '.rar;'
27            - '.exe;'
28            - '.bat;'
29            - '.com;'
30            - '.cmd;'
31            - '.reg;'
32            - '.msi;'
33            - '.htm;'
34            - '.html;'
35    condition: selection_main and 1 of selection_value_*
36falsepositives:
37    - Unlikely
38level: high

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