Ransomware: How It Works and Why It Is Growing

What began as relatively simple file encryption has developed into a larger criminal business. Modern ransomware incidents can interrupt operations, expose confidential information and create substantial recovery costs. 

How a Ransomware Incident Begins 

Ransomware frequently enters an organization through a fraudulent email, stolen password, unprotected remote-access service, outdated application or compromised supplier. 

After gaining access, criminals may search for valuable information and attempt to reach additional systems. Some groups steal data before disrupting access to it. This allows them to apply two forms of pressure: the organization may lose access to its files while also facing the threat that sensitive information will be published. 

This is sometimes called double extortion. 

The exact methods vary, but many incidents succeed because common security weaknesses have not been addressed. Weak passwords, missing software updates, excessive account privileges and unprotected backups can turn one compromised account into a serious business interruption. 

Why Ransomware Continues to Expand 

Ransomware has developed into an organized criminal economy. Some groups create malicious software and infrastructure, while other participants use those services to conduct attacks. This service-based structure enables more criminals to participate without developing every technical component themselves. 

Organizations also depend heavily on digital systems. A business that cannot access its customer records, payment systems or operational files may feel intense pressure to restore services quickly. 

The FBI’s 2025 Internet Crime Report recorded more than 3,600 ransomware complaints and reported losses exceeding $32 million. These figures do not capture every incident or the full cost of business interruption, recovery and reputational damage. 

Paying a ransom does not guarantee that information will be restored or deleted. Criminals may provide incomplete recovery tools, retain stolen data or target the same organization again. 

How Organizations Can Reduce the Risk 

The most effective ransomware strategy combines prevention with recovery preparation. 

Organizations should: 

• Enable multifactor authentication, especially for email, remote access and administrator accounts; 

• Install security updates promptly; 

• Limit each account to the access it genuinely needs; 

• Disable accounts that are no longer used; 

• Monitor networks for unusual activity; 

• Train employees to recognize phishing attempts; 

• Maintain an inventory of important systems and information; 

• Prepare and test an incident-response plan. 

Backups are particularly important. Copies of critical information should be protected so that ransomware cannot modify or delete them. Backup restoration should also be tested regularly. An untested backup may fail when it is needed most. 

The official CISA StopRansomware Guide recommends maintaining offline, encrypted backups and regularly testing recovery procedures. 

What to Do During an Incident 

If ransomware is suspected, affected systems should be separated from the network to limit further disruption. The organization should activate its incident-response plan and contact qualified cybersecurity professionals. 

Evidence should be preserved, and the incident should be reported to the relevant authorities. Customers, employees or partners may also need to be informed when their information is affected. 

Decisions about communication, recovery and possible legal obligations should involve management, technical experts and legal advisers. They should not be made under pressure by one person acting alone. 

Resilience Is the Best Defense 

No organization can guarantee that it will never face a cyber incident. The goal is to make an attack more difficult and prevent one compromised device from becoming a complete operational crisis. 

Ransomware grows when criminals believe organizations are unprepared and likely to pay. Strong authentication, rapid updates, limited access and recoverable backups reduce that advantage. 

The best defense is not simply the ability to block an attack. It is the ability to detect it quickly, contain the damage and restore operations safely.