Rundll32.EXE Calling DllRegisterServer Export Function Explicitly
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About the rule
Rule Type
Standard
Rule Description
Detects when the DLL export function 'DllRegisterServer' is called in the commandline by Rundll32 explicitly where the DLL is located in a non-standard path.
Severity
Trouble
Rule Requirement
Criteria
Action1:
actionname = "Process started" AND ((PROCESSNAME endswith "\rundll32.exe" OR ORIGINALFILENAME = "RUNDLL32.EXE") AND COMMANDLINE contains "DllRegisterServer") AND COMMANDLINE notcontains ":\Program Files (x86),:\Program Files\,:\Windows\System32\,:\Windows\SysWOW64"
select Action1.HOSTNAME,Action1.MESSAGE,Action1.COMMANDLINE,Action1.FILE_NAME,Action1.PROCESSNAME,Action1.USERNAME,Action1.PARENTPROCESSNAME,Action1.DOMAIN,Action1.ORIGINALFILENAME,Action1.PARENTPROCESSID,Action1.PROCESSID,Action1.PRODUCT_NAME,Action1.SECURITYID
Detection
Execution Mode
realtime
Log Sources
Windows
Author
Andreas Braathen (mnemonic.io)
