Intermediate level · Module 4: Malware Removal and Security Hygiene · Lesson 1 of 3
Recognising Malware
Spot the signs of infection.
In this lesson you will
- Describe common malware types
- Recognise symptoms
Key concepts
viruses and trojansadware and browser hijackersransomwaresymptoms
The lesson
Malware includes trojans disguised as useful software, adware and browser hijackers that change search pages, spyware and ransomware that encrypts files.
Symptoms: pop-ups, changed home pages, unknown programs, disabled security tools, slow performance and unexpected network activity.
Ask how it started — often a cracked program, a fake update or an email attachment.
Step by step
- Review symptoms on the lab image.
- List suspicious programs and extensions.
- Ask how the infection may have started.
- Record findings.
Practice activity
Document the symptoms on the lab image.
Expected result: A complete list of symptoms and likely cause.
Check your understanding
-
What does a browser hijacker do?
Show answer
Changes browser settings such as the home or search page.
-
What is a common source of malware?
Show answer
Cracked software, fake updates or email attachments.
Taught live by an instructor — online or in person. Free course lessons are for self-study and do not lead to a certificate — see registration options.