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Malware Explained: Types, Risks, Prevention and Incident Response

· Original article ↗

Summary

A comprehensive guide explains malware types, how infections spread and cause harm, and practical steps for prevention and response, including isolating suspected devices, protecting evidence, restoring from trusted backups and reviewing exposed accounts.

Key points

  • Malware labels describe different things—including how code spreads, its disguise, capabilities or intended outcome—and one incident may involve several types.
  • Common entry paths include phishing, unpatched vulnerabilities, stolen credentials, unsafe software, exposed remote services and compromised supply chains.
  • Reduce risk with timely updates, unique passwords, phishing-resistant MFA, least privilege, network segmentation and protected, tested backups.
  • For a suspected infection, stop sensitive activity, isolate affected devices when safe and contact IT or a qualified responder; avoid uploading sensitive evidence to public services.
  • Organizations should assess identity access and incident scope, preserve relevant evidence, rebuild from trusted sources when integrity is uncertain, and restore in a controlled order.
  • A clean scan or absence of alerts does not prove an infection is absent; conclusions should distinguish observed evidence, inference and unavailable coverage.

Article Details

Topic
Malware types, history, impacts, prevention, and incident response

People

Bob ThomasCreated the Creeper program, described in the article as an experimental precursor to modern malware.

Malware

BrainTimeline from the Creeper experiment through Brain, Morris, ILOVEYOU, Stuxnet, CryptoLocker, Mirai, WannaCry, NotPetya, Colonial Pipeline, and Change HealthcareCryptoLockerTimeline from the Creeper experiment through Brain, Morris, ILOVEYOU, Stuxnet, CryptoLocker, Mirai, WannaCry, NotPetya, Colonial Pipeline, and Change HealthcareILOVEYOUTimeline from the Creeper experiment through Brain, Morris, ILOVEYOU, Stuxnet, CryptoLocker, Mirai, WannaCry, NotPetya, Colonial Pipeline, and Change HealthcareMiraiTimeline from the Creeper experiment through Brain, Morris, ILOVEYOU, Stuxnet, CryptoLocker, Mirai, WannaCry, NotPetya, Colonial Pipeline, and Change HealthcareMorris WormIn 1988, the Morris Worm became the first major attack on the early internet.NotPetyaTimeline from the Creeper experiment through Brain, Morris, ILOVEYOU, Stuxnet, CryptoLocker, Mirai, WannaCry, NotPetya, Colonial Pipeline, and Change HealthcareStuxnetTimeline from the Creeper experiment through Brain, Morris, ILOVEYOU, Stuxnet, CryptoLocker, Mirai, WannaCry, NotPetya, Colonial Pipeline, and Change HealthcareWannaCryTimeline from the Creeper experiment through Brain, Morris, ILOVEYOU, Stuxnet, CryptoLocker, Mirai, WannaCry, NotPetya, Colonial Pipeline, and Change Healthcare

Countries

United StatesIn February 2024, the Change Healthcare ransomware incident disrupted healthcare and billing systems across the United States.

Industries

HealthcareTimeline from the Creeper experiment through Brain, Morris, ILOVEYOU, Stuxnet, CryptoLocker, Mirai, WannaCry, NotPetya, Colonial Pipeline, and Change Healthcare

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