Computer Virus
ICSE · Class 7 · Computer Studies
Quick revision notes for Computer Virus — ICSE Class 7 Computer Studies. Key concepts, formulas, and definitions for last-minute revision.
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Key Topics to Revise
1. Malware and Computer Virus
- Malware refers to software intentionally created to cause harm to a user, computer system, or network.
- The word Malware is composed of Malicious and software.
- A computer virus is a malicious program with the ability to execute and replicate itself.
2. Sources and Symptoms of Virus Attack
- A virus can enter through infected storage media such as CD, DVD, and pen drive.
- Pirated software can carry viruses.
- Hired computer games or audio or video CDs can also be sources of viruses.
3. Types of Viruses
- Viruses are classified into four categories: Boot sector virus, Program virus, Macro virus, and Stealth virus.
- Boot sector virus affects the Boot Sector or Master Boot Record of the hard disk during booting.
- Boot sector virus can halt the system and may stop the operating system from loading.
4. Other Malware
- Worm is a self-sufficient computer program that copies and multiplies itself using computer networks and security flaws.
- Worm does not need another program or user to spread.
- Worm does not affect the functioning of a system but interrupts services and drastically decreases available memory.
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