Exam 350-201 topic 1 question 66 discussion

The "MZ" header does indicate a DOS MZ executable. However, in modern Windows executables, this MZ header is part of a DOS stub that exists before the actual PE (Portable Executable) header. The message "This program cannot be run in DOS mode" is part of that stub, meant to display if someone tries to run the file in a DOS environment. So, what does this mean? If the file only had the MZ header and DOS code, it would be a pure DOS MZ executable. But if it also contains a "PE" header (which your image shows), then it's a Windows executable that includes a DOS stub.

The file in question indicates a DOS MZ executable format. The MZ signature at the beginning of the file (as seen in the hexadecimal representation) is characteristic of an executable file format for DOS. This signature, combined with the text "This program cannot be run in DOS mode," which is typically included as a message in DOS MZ executables to be displayed when they are run in a non-DOS environment, confirms that the file is a DOS MZ executable.

If you look the Majic is 4D and 5A coupled with "can not be run in DOS mode", indicates it is DOS MZ!

A 100% https://en.wikipedia.org/wiki/DOS_MZ_executable

check https://www.fortinet.com/blog/threat-research/dll-side-loading-technique-used-in-recent-kaseya-ransomware-attack

The DOS MZ executable format is the executable file format used for. EXE files in DOS. The file can be identified by the ASCII string "MZ" (hexadecimal: 4D 5A) at the beginning of the file (the "magic number").

Its A 100% Check: http://4d5asecurity.com/why-4d5a.

C or D no idea.