Rundll32 UNC Path Execution

 1title: Rundll32 UNC Path Execution
 2id: 5cdb711b-5740-4fb2-ba88-f7945027afac
 3status: test
 4description: Detects rundll32 execution where the DLL is located on a remote location (share)
 5references:
 6    - https://www.cybereason.com/blog/rundll32-the-infamous-proxy-for-executing-malicious-code
 7author: Nasreddine Bencherchali (Nextron Systems)
 8date: 2022/08/10
 9tags:
10    - attack.defense_evasion
11    - attack.execution
12    - attack.t1021.002
13    - attack.t1218.011
14logsource:
15    category: process_creation
16    product: windows
17detection:
18    selection_img:
19        - Image|endswith: '\rundll32.exe'
20        - OriginalFileName: 'RUNDLL32.EXE'
21        - CommandLine|contains: 'rundll32'
22    selection_cli:
23        CommandLine|contains: ' \\\\'
24    condition: all of selection_*
25falsepositives:
26    - Unlikely
27level: high

References

• Rundll32: The Infamous Proxy for Executing Malicious Code

  

  Take a deeper dive into an often abused Microsoft-signed tool, the infamous rundll32.exe, which allows adversaries to execute malicious code during their offensive operations through a technique which we explain in detail...

  
  Read More

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