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      Malware: malicious software

      Lesson details

      Learning outcome

      I can describe malware and explain how it attacks systems.

      Key learning points

      1. Malware is malicious software designed to harm, steal, or disrupt computer systems.
      2. There are different types of malware, including viruses, worms, trojans, ransomware, spyware, and adware.
      3. Each type of malware works differently, but they often trick users into downloading or installing them.
      4. Malware can cause serious damage, such as data loss, system failure or financial loss.

      Keywords

      • Malware - malicious software - a program designed to cause damage to computer systems, corrupt or change files, steal data or cause disruption to services

      • Infect - to spread something harmful like a virus or malware into a system

      • Stealing - the act of taking something that doesn’t belong to you, without permission and with no intention of giving it back

      • Ransom - the money cybercriminals demand after locking files or systems

      Common misconception

      Malware only affects computers, not phones or tablets.

      Malware can infect any idevice that is connected to the internet, including smartphones, tablets and smart TVs. Mobile malware is increasingly common and can steal data, track location or lock users out of their devices — just like on computers.

      Teacher tip

      Incorporate storytelling to explain how malware spreads and impacts victims. Turn famous or recent malware incidents into short, engaging stories. Storytelling helps students remember key concepts and see the human side of cybersecurity threats, making lessons more impactful.

      Licence

      This content is © Oak National Academy Limited (2025), licensed on Open Government Licence version 3.0
      except where otherwise stated. See Oak's terms & conditions
      (Collection 2).

      Lesson video

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      Prior knowledge starter quiz

      6 Questions

      Q1.
      What is social engineering?

      a method to design secure software
      a technique to improve computer performance
      a way to protect against cybercriminals
      Correct answer: a cybercrime that manipulates people into revealing confidential information

      Q2.
      Which of the following is NOT a social engineering technique?

      phishing
      pharming
      Correct answer: encryption
      blagging

      Q3.
      Who is the target in social engineering attacks?

      Correct answer: humans
      computer systems
      security software
      firewalls

      Q4.
      What is the social engineering technique where someone pretends to be a trusted person to gain confidential information?

      Correct Answer: blagging

      Q5.
      What is the social engineering technique where cybercriminals use fake emails or websites to trick people into revealing confidential information?

      Correct Answer: phishing

      Q6.
      What is the technique called where users are redirected to fake websites to steal their information?

      Correct Answer: pharming

      6 Questions

      Q1.
      What is the term for software designed to harm, exploit or secretly control a system or device?

      Correct Answer: malware

      Q2.
      What is the main goal of ransomware?

      to steal passwords
      Correct answer: to demand payment after locking files or systems
      to track a user’s location
      to delete all files on a system

      Q3.
      How does spyware affect a user?

      Correct answer: it tracks user activity and steals sensitive information
      it locks the user out of their device
      it deletes files from the system
      it spreads to other devices on a network

      Q4.
      What does a trojan malware disguise itself as?

      a firewall
      a network router
      Correct answer: a harmless or useful program
      a horse

      Q5.
      What is the difference between a virus and a worm?

      a virus spreads on its own, while a worm needs user action
      a virus only affects networks, while a worm affects devices
      a worm only affects computers, while a virus affects phones
      Correct answer: a worm spreads on its own, while a virus needs user action

      Q6.
      Which of the following statements about malware is True?

      malware only affects computers, not phones or tablets
      malware cannot infect devices connected to the internet
      Correct answer: malware can infect any internet-connected device, including phones and tablets
      malware only targets large organisations, not individuals

      To help you plan your 11 computer science lesson on: Malware: malicious software, download all teaching resources for free and adapt to suit your pupils' needs...