Home Videos Exercises MCQ Q&A
Lesson 9 of 10 – Computer Virus
90%

Computer Virus

Computer Viruses are unwanted software programs or pieces of code that interfere with the functioning of the computer.

They spread through infected files, data and networks and can replicate themselves to infect other systems.

Types of Computer Virus

Overwrite Virus

Overwrites original file data.

Append Virus

Attaches itself to files.

Macro Virus

Infects document macros.

Boot Virus

Infects boot sector.

Resident Virus

Stays in memory and infects files.

Non-resident Virus

Does not stay in memory.

File Infector Virus

Infects executable files.

Computer Worm

Spreads without host program.

Trojan Horse

Malicious software disguised as safe.

Polymorphic Virus

Changes form to avoid detection.

Symptoms of Computer Virus

  • Slow performance
  • Frequent pop-ups
  • System crashes
  • Unknown programs
  • Network issues
  • Strange messages
  • Display problems

🧠 Quiz

Which virus infects boot sector?