Rundll32 Application Bypass with DllRegisterServer Function (RedCanary Threat Detection Report)

 1title: Rundll32 Application Bypass with DllRegisterServer Function (RedCanary Threat Detection Report)
 2id: f6d0c39a-96fe-45c5-b3c8-7dbea2a3f34c
 3status: experimental
 4description: Detects the DllRegisterServer export function implemented with Rundll32. Part of the RedCanary 2023 Threat Detection Report.
 5references:
 6    - https://redcanary.com/threat-detection-report/techniques/rundll32/
 7author: RedCanary, Sigma formatting by Micah Babinski
 8date: 2023/05/10
 9tags:
10    - attack.defense_evasion
11    - attack.t1218.011
12logsource:
13    category: process_creation
14    product: windows
15detection:
16    selection:
17        Image|endswith: '\rundll32.exe'
18        CommandLine|contains: 'DllRegisterServer'
19    condition: selection
20falsepositives:
21    - Unknown
22level: low```

References

• Rundll32 - Red Canary Threat Detection Report

  

  Adversaries use Rundll32, a native Windows process, to execute malicious code through DLLs, often to bypass application controls.

  
  Read More

Related rules

• Rundll32 Injection into LSASS (RedCanary Threat Detection Report)
• Rundll32 Suspicious Process Lineage (RedCanary Threat Detection Report)
• Rundll32 Without a Command Line (RedCanary Threat Detection Report)
• Application Bypass with RunDLL32 and DllRegisterServer Function
• Rundll32 with Suspicious Export Functionalities