Trojan horse

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Quick Questions

Shade in the A or B circle for each question.

1. A student downloads a free game from an unknown website. While they play, it secretly steals their saved passwords. What type of malware is this?

A Firewall

B Trojan horse

2. Which statement about how a Trojan horse gets onto a computer is correct?

A It copies itself across the network on its own

B The user installs it, thinking it is safe

3. True or false: A Trojan horse replicates itself and spreads to other computers.

A False

B True

4. Which is a common aim of a Trojan horse?

A Open a back door so a hacker can get in

B Make the computer run faster

5. Which describes the main difference between a Trojan horse and a virus?

A A Trojan pretends to be useful software but does not copy itself

B A Trojan copies itself into other files but a virus does not

Match the Pairs

Draw a line connecting each item on the left to its match on the right.

Left column		Right column
1Trojan horse		AA Trojan's aim: open a hidden way in so an attacker can access the computer or steal data later
2backdoor = True		BA Trojan horse must be disguised as useful or harmless software. With no disguise, the user would not install it willingly.
3A Trojan horse does not replicate itself, unlike a virus, so it relies on users choosing to install it		Cinstall("free_game.exe")
4A Trojan is disguised as a free app or file that the user willingly installs		Dtrojan.copies_itself = False
5trojan.copies_itself = True		EA Trojan horse does not replicate itself. Saying it copies itself confuses it with a virus or worm.
6trojan.disguise = "none"		FMalware disguised as useful or harmless software that the user installs willingly, then secretly does harm

Definitions

Trojan horse

Fill in the Blanks

Complete each line of code by filling in the missing parts.

A ____________ looks like a free app

A Trojan horse does not _________ itself

Trojan aim: open a _________ or steal data

A Trojan needs the user to _______ it

virus.replicates = TRUE Trojan.replicates = _____

Spot the Error

Shade in the letter of the line that contains an error.

Question 1

A file ← "free_wallpaper.exe"

B looks_useful ← FALSE

C user_installs ← TRUE

D hidden_action ← "open back door"

Question 2

A app ← "free PDF converter"

B replicates ← TRUE

C hidden_aim ← "steal data"

Question 3

A type ← "Trojan horse"

B installed_by ← "attacker"

C aim ← "open a back door"

Question 4

A malware ← "Worm"

B spreads_alone ← FALSE

C needs_user_to_install ← TRUE

Question 5

A IF software = "Trojan" THEN

B disguised ← TRUE

C replicates ← FALSE

D aim ← "speed up the PC"

E ENDIF

Answer Key

Trojan horse

Section A: Quick Questions

B — Trojan horse

B — The user installs it, thinking it is safe

A — False

A — Open a back door so a hacker can get in

A — A Trojan pretends to be useful software but does not copy itself

Section B: Match the Pairs

Trojan horse → Malware disguised as useful or harmless software that the user installs willingly, then secretly does harm

backdoor = True → A Trojan's aim: open a hidden way in so an attacker can access the computer or steal data later

A Trojan horse does not replicate itself, unlike a virus, so it relies on users choosing to install it → trojan.copies_itself = False

A Trojan is disguised as a free app or file that the user willingly installs → install("free_game.exe")

trojan.copies_itself = True → A Trojan horse does not replicate itself. Saying it copies itself confuses it with a virus or worm.

trojan.disguise = "none" → A Trojan horse must be disguised as useful or harmless software. With no disguise, the user would not install it willingly.

Section C: Definitions

Trojan horse — Malware disguised as useful or harmless software. The user installs it willingly, then it secretly does harm, such as opening a back door or stealing data. It does not replicate itself.

Section D: Fill in the Blanks

A Trojan horse looks like a free app

A Trojan horse does not replicate itself

Trojan aim: open a back door or steal data

A Trojan needs the user to install it

virus.replicates = TRUE
Trojan.replicates = FALSE

Section E: Spot the Error

B — A Trojan horse is disguised as useful or harmless software, so looks_useful should be TRUE. Users only install it because it looks genuine.

B — A Trojan horse does not replicate itself. This is a key difference from a virus or worm, so replicates should be FALSE.

B — The user installs a Trojan horse willingly, because they think it is useful. It should be installed_by ← "user".

A — The program describes a Trojan horse: it does not spread alone and needs the user to install it. A worm replicates itself, so the type should be "Trojan horse".

D — A Trojan horse carries out a hidden harmful action, such as stealing data or opening a back door. It does not help the computer. It should be aim ← "steal data".