This trick is used to check antivirus activity. If you feel that your antivirus software is not working well then you can confirm it by using this trick.

(i). Open Notepad and type this code.

X5O!P%@AP[4\PZX54(P^)7CC)7}$EICAR-STANDARD-ANTIVIRUS-TEST-FILE!$H+H*

(ii).  Now save it with extension “exe” (like antivirus.exe)
(iii).If your antivirus software is working properly then it will detect this file and will try to

       remove it as soon as you save it.
(iv). If your antivirus tries to remove this file, it means that your antivirus is working
     properly and if it doesn’t try to remove this file then you should use some other
      reliable antivirus software.