Microsoft Office DLL Sideload

calendar May 15, 2025 · attack.defense-evasion attack.persistence attack.privilege-escalation attack.t1574.001  ·
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Detects DLL sideloading of DLLs that are part of Microsoft Office from non standard location

Sigma rule (View on GitHub)

 1title: Microsoft Office DLL Sideload
 2id: 829a3bdf-34da-4051-9cf4-8ed221a8ae4f
 3status: test
 4description: Detects DLL sideloading of DLLs that are part of Microsoft Office from non standard location
 5references:
 6    - https://hijacklibs.net/ # For list of DLLs that could be sideloaded (search for dlls mentioned here in there)
 7author: Nasreddine Bencherchali (Nextron Systems), Wietze Beukema (project and research)
 8date: 2022-08-17
 9modified: 2023-03-15
10tags:
11    - attack.defense-evasion
12    - attack.persistence
13    - attack.privilege-escalation
14    - attack.t1574.001
15logsource:
16    category: image_load
17    product: windows
18detection:
19    selection:
20        ImageLoaded|endswith: '\outllib.dll'
21    filter:
22        ImageLoaded|startswith:
23            - 'C:\Program Files\Microsoft Office\OFFICE'
24            - 'C:\Program Files (x86)\Microsoft Office\OFFICE'
25            - 'C:\Program Files\Microsoft Office\Root\OFFICE'
26            - 'C:\Program Files (x86)\Microsoft Office\Root\OFFICE'
27    condition: selection and not filter
28falsepositives:
29    - Unlikely
30level: high

References

  • HijackLibs.net

    HijackLibs provides an curated list of DLL Hijacking opportunities: mappings between DLLs and vulnerable executables, with additional metadata for more context. For defenders, this project can provide valuable information when trying to detect DLL Hijacking attempts; for red teamers, this project can help identify DLLs that can be used to achieve DLL Hijacking.


    Read More

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