Internet Shortcut Shell Extension DLL.
rundll32.exe url.dll,FileProtocolHandler file://^C^:^/^W^i^n^d^o^w^s^/^s^y^s^t^e^m^3^2^/^c^a^l^c^.^e^x^e
Launch an executable by calling FileProtocolHandler.
Load an executable payload by specifying the file protocol handler (obfuscated).
c:\windows\system32\url.dll, c:\windows\syswow64\url.dll
Sigma: https://github.com/SigmaHQ/sigma/blob/62d4fd26b05f4d81973e7c8e80d7c1a0c6a29d0e/rules/windows/process_creation/proc_creation_win_rundll32_susp_activity.yml
Adam (OpenURL) (@hexacorn), Jimmy (OpenURL) (@bohops), Malwrologist (FileProtocolHandler - HTA) (@DissectMalware), r0lan (Obfuscation) (@r0lan)