i think i have got something.the anti virus or anti malware test files act just like a virus try this.
*www.eicar.org/anti_virus_test_file.htm
disclaimer on the website-EICAR cannot be held responsible when these files or your AV scanner in combination with these files cause any damage to your computer. YOU DOWNLOAD THESE FILES AT YOUR OWN RISK. Download these files only if you are sufficiently secure in the usage of your AV scanner. EICAR cannot and will not provide any help to remove these files from your computer. Please contact the manufacturer/vendor of your AV scanner to seek such help.
this is promising

plz rep me for hard work.still searching....