What is Malware?

Malware (malicious software) is any software intentionally designed to cause damage to a computer, server, client, or computer network. Malware can take many forms and has various delivery methods and purposes.

📈 Impact

Malware attacks cost organizations an estimated $2.4 million per incident on average, with recovery taking an average of 50 days.

Types of Malware

Viruses

Self-replicating malware that attaches itself to clean files and spreads throughout a computer system, infecting other files and programs.

Worms

Standalone malware that replicates itself to spread to other computers, often exploiting security vulnerabilities.

Trojans

Malicious software disguised as legitimate software. Users are tricked into loading and executing Trojans on their systems.

Ransomware

Malware that encrypts a victim's files and demands a ransom payment to restore access.

Spyware

Software that secretly monitors and collects information about users' activities.

Adware

Software that automatically delivers advertisements, often bundled with free software.

Rootkits

Software that enables unauthorized access to a computer while hiding its existence.

Common Infection Vectors

Phishing Emails

Malicious attachments or links in deceptive emails

Drive-by Downloads

Automatic downloads when visiting compromised websites

Software Vulnerabilities

Exploiting unpatched security holes in software

Removable Media

Infected USB drives and other removable devices

Social Engineering

Tricking users into installing malware themselves

Prevention Strategies

Technical Controls

Essential Protection

  • Use reputable antivirus and anti-malware software
  • Keep all software and systems updated
  • Enable firewalls and network security
  • Use email filtering and web protection
  • Implement application whitelisting

User Education

Safe Browsing

Avoid suspicious websites and downloads

Email Safety

Don't open attachments or click links from unknown senders

Software Sources

Only download software from official sources

Detection and Indicators

Common Signs of Infection

  • Slow computer performance
  • Frequent crashes or error messages
  • Unexpected pop-up windows
  • New toolbars or browser extensions
  • Changes to homepage or search engine
  • Unusual network activity
  • Missing or corrupted files

Incident Response

Immediate Actions

Disconnect from network, isolate infected systems, preserve evidence

Containment

Identify infection scope, prevent further spread

Removal

Use anti-malware tools, manual removal if necessary

Recovery

Restore from backups, verify system integrity