Crossword

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Across
  1. 2. It is very dangerous virus but comes as a friendly program
  2. 6. It is a technique used by antivirus programs for detecting viruses
  3. 8. It a virus that is placed on a computer or mobile device without user's knowledge that collects all the information
  4. 9. It is the destructive event the program is intended to deliver
  5. 10. It is the first PC virus
Down
  1. 1. This virus designed in such a way that it looks like an antivirus software
  2. 3. It is a virus that restricts access to your computer system and demands a ransom
  3. 4. This virus spread by the files attached to e-mail messages
  4. 5. It detects the changes that the virus causes in the computer
  5. 7. It is an e-mail message that warns users of a non-existent virus or other malware