Ransomware is a type of malicious software that an attacker installs on your device to encrypt your files, making them inaccessible until you pay a ransom. Once infected, you see a message demanding money in exchange for a decryption key.
The infection typically spreads through phishing emails with malicious attachments, downloads from compromised websites, or unpatched security vulnerabilities. Once activated, ransomware scans your hard drive and encrypts documents, photos, videos, and backups using strong encryption that you cannot break without the attacker's key.
Ransomware causes real disruption. A small business infected might lose access to customer databases, invoices, and operations for days or weeks. Hospitals have faced life-threatening delays when patient records became locked. Even if you pay, attackers may not provide the decryption key, or your device might already be damaged.
Modern variants also steal your data before encrypting it, then threaten to publish sensitive information if you refuse to pay. This double extortion tactic increases pressure on victims.
Protecting yourself involves several layers: keep your operating system and software patched with the latest security updates, use reputable antivirus software, maintain offline backups of important files, be cautious with email attachments from unknown senders, and avoid clicking suspicious links. When buying antivirus or security software, look for products that offer ransomware-specific protection and real-time file monitoring rather than just signature-based detection.