Regsvr32 Execution From Potential Suspicious Location

 1title: Regsvr32 Execution From Potential Suspicious Location
 2id: 9525dc73-0327-438c-8c04-13c0e037e9da
 3related:
 4    - id: 8e2b24c9-4add-46a0-b4bb-0057b4e6187d
 5      type: obsoletes
 6status: test
 7description: Detects execution of regsvr32 where the DLL is located in a potentially suspicious location.
 8references:
 9    - https://web.archive.org/web/20171001085340/https://subt0x10.blogspot.com/2017/04/bypass-application-whitelisting-script.html
10    - https://app.any.run/tasks/34221348-072d-4b70-93f3-aa71f6ebecad/
11author: Florian Roth (Nextron Systems), Nasreddine Bencherchali (Nextron Systems)
12date: 2023/05/26
13tags:
14    - attack.defense_evasion
15    - attack.t1218.010
16logsource:
17    category: process_creation
18    product: windows
19detection:
20    selection_img:
21        - Image|endswith: '\regsvr32.exe'
22        - OriginalFileName: 'REGSVR32.EXE'
23    selection_cli:
24        CommandLine|contains:
25            - ':\ProgramData\'
26            - ':\Temp\'
27            - ':\Users\Public\'
28            - ':\Windows\Temp\'
29            - '\AppData\Local\Temp\'
30            - '\AppData\Roaming\'
31    condition: all of selection_*
32falsepositives:
33    - Some installers might execute "regsvr32" with DLLs located in %TEMP% or in %PROGRAMDATA%. Apply additional filters if necessary.
34level: medium

References

• Bypass Application Whitelisting Script Protections - Regsvr32.exe & COM Scriptlets (.sct files)

  

  So, I have been working this out the last few days. I was trying solve a particular problem. I needed a reverse shell on workstation lock...

  
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• Analysis hola.doc (MD5: 843F6C0C24BFC31B6A19471935A092DA) Malicious activity - Interactive analysis ANY.RUN

  

  Interactive malware hunting service. Live testing of most type of threats in any environments. No installation and no waiting necessary.

  
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Related rules

• Potentially Suspicious Child Process Of Regsvr32
• Potentially Suspicious Regsvr32 HTTP IP Pattern
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• Regsvr32 DLL Execution With Suspicious File Extension
• Regsvr32 Execution From Highly Suspicious Location