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How to create a simple, harmless virus for Windows

ever wanted to do a harmless but effective joke to a friend on his PC by installing a dummy virus that can cause the effect with a certain "emotional impact", such as opening and closing the DVD drive, rather than turning off the monitor or the opening of windows at random?

If the answer is yes then you should definitely read this post!

The operating principle of our fake virus is based on the use of nircmd.exe , a free utility downloadable from here , which is capable of performing a series of operations and controls in Windows mode "silent", ie without opening the window of performance seems like a trivial thing, but you'll soon realize you also that this is a utility that lends itself to a lot of interesting applications .
Here are the steps to create and enable our virus :

1. Once you download nircmd.exe , unzip and run the executable " nircmd.exe " in the victim's computer, then select the button "Copy to Windows directory .
2. Create a file " fun.bat " in any folder and Inserit the following content: @ echo off

    
    cd% windir% 
    nircmd.exe infobox "Hello I am a VIRUS and now take possession of your PC! " 
    FOR%% A IN (1 2 3 4 5 6 7 8 9 10) DO (
    FOR%% B IN (1 2 3 4 5) DO (
    nircmd.exe exec show "% windir% \\ system32 \\ calc. exe "
    ) 
    nircmd.exe wait 500 
    nircmd.exe monitor off 
    nircmd.exe cdrom open d: 
    nircmd.exe cdrom close d: 
    nircmd.exe beep 500 500 1000 
    nircmd.exe wait 
    nircmd.exe monitor on 
    NirCmd . exe wait 
    500) 

   
   
3. Drag the file on the Start menu in Start => Programs => StartUp .

At this point you do not need it for the world to miss the scene when your "alleged" friend will restart your PC and start to see your CD / DVD to open and close continuously, dozens of windows open, intermittent beep and the monitor turns on and off every two seconds!

In any case, apart from the playful, nircmd.exe also lends itself to many interesting and useful applications in the management of your operating system. For a more complete list of examples of commands and controls managed I suggest you visit the official website.