DLL Search Order Hijackig Via Additional Space in Path

Detects when an attacker create a similar folder structure to windows system folders such as (Windows, Program Files...) but with a space in order to trick DLL load search order and perform a "DLL Search Order Hijacking" attack

Sigma rule (View on GitHub)

 1title: DLL Search Order Hijackig Via Additional Space in Path
 2id: b6f91281-20aa-446a-b986-38a92813a18f
 3status: test
 4description: |
 5    Detects when an attacker create a similar folder structure to windows system folders such as (Windows, Program Files...)
 6    but with a space in order to trick DLL load search order and perform a "DLL Search Order Hijacking" attack    
 7references:
 8    - https://twitter.com/cyb3rops/status/1552932770464292864
 9    - https://www.wietzebeukema.nl/blog/hijacking-dlls-in-windows
10author: frack113, Nasreddine Bencherchali (Nextron Systems)
11date: 2022/07/30
12tags:
13    - attack.persistence
14    - attack.privilege_escalation
15    - attack.defense_evasion
16    - attack.t1574.002
17logsource:
18    category: file_event
19    product: windows
20detection:
21    selection:
22        TargetFilename|startswith:
23            - 'C:\Windows \'
24            - 'C:\Program Files \'
25            - 'C:\Program Files (x86) \'
26        TargetFilename|endswith: '.dll'
27    condition: selection
28falsepositives:
29    - Unknown
30level: high

References

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