Microsoft HTML Viewer
rundll32.exe Mshtml.dll,PrintHTML "C:\temp\calc.hta"
Invoke an HTML Application via mshta.exe (note: pops a security warning and a print dialogue box).
Launch an HTA application.
c:\windows\system32\mshtml.dll, c:\windows\syswow64\mshtml.dll
Sigma: https://github.com/SigmaHQ/sigma/blob/62d4fd26b05f4d81973e7c8e80d7c1a0c6a29d0e/rules/windows/process_creation/proc_creation_win_rundll32_susp_activity.yml
Pierre-Alexandre Braeken (@pabraeken)