← VCE Cyber Security

Worms

Malware that spreads by replicating itself across a network without needing a host file or user action

Part of: VCE Applied Computing - U2O2 - Cyber Security — Module 31, 7-8 Digital Technologies Vic Curric - Digital Systems and Security — Module 69, 9-10 Digital Technologies Vic Curric - Digital Systems and Security — Module 49, IGCSE Computer Science 0478 — 5.3 Cyber Security — Module 8, ACARA Digital Technologies Years 9–10 — Cyber Security Threats and Vulnerabilities — Module 22, WA Computer Science ATAR Year 11 — Cyber Security — Module 34

Understanding Worms in VCE Cyber Security

What it does: Worms don't need to attach to a file; they travel across networks on their own. As a worm replicates rapidly, it can consume bandwidth and overload a network. Unlike a virus, a worm can spread across a network without needing a host file. Antivirus software can identify and remove known worm signatures. A worm is malware that self-replicates and spreads independently across networks. Assuming user action is always required ignores that worms can spread on their own.

Common mistakes: Wrong — a worm does not need a host file; it can spread on its own. Wrong — worms do not need a host file to spread, unlike viruses.

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Free printable worksheet with full answer key — or add this module to a class and your students practise it interactively.

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This module's key terms are also in a printable crossword (Modules 31–40) and word search (Modules 21–40).

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Each concept is reinforced from every angle — learned, then applied, then tested.

Learning
Duo
Does a worm need a host file to spread?
TrueFalse
Matches
A worm always needs a host file to spread
↓
A worm can spread without any host file
Applying
Meanings
Term
Worm
Meaning
Malware that spreads by replicating itself across a network without needing a host file or user action
Practice
A worm replicates itself and
Testing
Gaps
A worm without a host.
Check Answer
Spots
1A worm needs a host file.
2It spreads across a network.

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Quick Questions

1. Does a worm need a host file to spread?
A. False ✓
B. True
Unlike a virus, a worm can spread across a network without needing a host file.
2. Can a worm replicate itself?
A. Yes ✓
B. No
A worm copies itself to spread across systems and networks.
3. Does a worm always require a user to click or run something to spread?
A. False ✓
B. True
A worm can spread automatically across a network without user action.
4. Can worms overload network traffic as they spread?
A. No
B. Yes ✓
Worms can consume bandwidth and overload networks as they replicate and spread.
5. Can antivirus software detect known worms?
A. No
B. Yes ✓
Antivirus software can identify and remove known worm signatures.

Match the Pairs

Worm → Malware that spreads by replicating itself across a network without a host file
Self-replication → A worm making copies of itself to spread further
A worm spreads without needing a host file → A worm moving directly across a network
Worms can overload network traffic → A network slowing down as a worm multiplies
A worm always needs a host file to spread → A worm can spread without any host file
A worm always needs a user to click something → A worm can spread automatically without user action

Key Term

Worm
Malware that spreads by replicating itself across a network without needing a host file or user action

Fill in the Blanks

1. A worm replicates without a host.
Hint: Type the word meaning to make copies of itself.
2. It spreads across a network.
Hint: Type the word meaning to move to other systems.
3. Worms do not need a host file.
Hint: Type the word meaning to require something.
4. A worm can copy itself freely.
Hint: Type the word referring to the worm copying its own code.
5. Worms can overload network traffic.
Hint: Type the word meaning to place excessive strain on something.

Spot the Error

Question 1
A A worm needs a host file.
B It spreads across a network.
C It replicates on its own.
Line A — Wrong — a worm does not need a host file; it can spread on its own.
Question 2
A Worms travel via networks.
B They need a host to spread.
C They can spread quickly.
Line B — Wrong — worms do not need a host file to spread, unlike viruses.
Question 3
A A worm copies itself alone.
B It needs no host file at all.
C It always needs a user click.
Line C — Wrong — a worm can spread automatically without needing a user to click anything.
Question 4
A Worms spread across networks.
B They replicate themselves.
C They can slow down systems.
D They always need a host file.
Line D — Wrong — worms do not need a host file; that trait belongs to viruses, not worms.
Question 5
A A worm needs a host program.
B It spreads without any host.
C It can replicate itself.
Line A — Wrong — a worm does not need a host program to spread across a network.

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