What Is Ransomware
Ransomware is a type of malware that encrypts files on an infected computer and demands a ransom in exchange for the decryption key. Every environment — from personal computers to enterprise core systems — is a potential target.
Modern ransomware goes beyond simple file encryption. The dominant tactic is now double extortion, where attackers first exfiltrate data and then threaten to publish it unless the ransom is paid.
Primary Infection Vectors
Phishing Emails
This is the most common infection vector. Users become infected by opening attachments or clicking links in emails that impersonate legitimate organizations. Mastering the basics of email security is the first step in ransomware defense.
Exploiting Vulnerabilities
Attackers exploit known vulnerabilities in operating systems and software to gain access. Remote Desktop Protocol (RDP) vulnerabilities and unpatched VPN appliance flaws are particularly frequent targets.
Malicious Websites
Compromised websites or malicious advertisements (malvertising) can exploit browser vulnerabilities to download malware onto your system.
Supply Chain Attacks
In this approach, malware is injected into legitimate software updates. Because the infection arrives through a trusted software update channel, detection is extremely difficult.
Ransomware Prevention Strategies
Maintain Regular Backups
The most critical defense is a solid backup strategy. Follow the "3-2-1 rule":
- Keep at least 3 copies of your data
- Store them on 2 or more different types of media
- Keep 1 copy offline (disconnected from the network)
Online-only backups are insufficient — ransomware can encrypt backup destinations as well.
Keep Your OS and Software Up to Date
Apply security updates as soon as they are released. Enabling automatic updates is strongly recommended.
Be Cautious with Suspicious Emails and Links
Never open unexpected attachments or links. Even if the sender appears to be someone you know, their account may have been compromised. Understanding social engineering tactics is key to your defense.
Install Security Software
Deploy security software with real-time protection and keep its definitions up to date at all times.
What to Do If You're Infected
- Immediately disconnect the infected device from the network
- Do not pay the ransom — there is no guarantee your files will be decrypted, and payment funds criminal organizations
- Report the incident to law enforcement (your local cybercrime unit)
- Check the No More Ransom project (nomoreransom.org) for available decryption tools
- Restore your data from backups
- Identify the infection vector and implement measures to prevent recurrence