What is Ransomware? Prevention and Recovery
Ransomware attacks hit a new record in 2025, with over 4,600 organizations paying a combined $1.1 billion in ransom. The average ransom demand for individuals reached $4,500, while business demands averaged $812,000. Major hospitals, school districts, and city governments were forced to operate on paper for weeks while attackers held their data hostage.
Ransomware isn't just a corporate problem. Individual users are targeted through phishing emails, malicious downloads, and compromised websites. If your personal photos, documents, and financial records matter to you, understanding ransomware is essential.
Got a suspicious download or email attachment? Paste the link into our free scanner →
How Ransomware Works
Ransomware is malware that encrypts your files — documents, photos, videos, databases — making them inaccessible. The attacker then demands payment (usually in cryptocurrency) in exchange for the decryption key. Without the key, your files are effectively destroyed.
The infection chain typically follows these steps:
- You click a malicious email attachment, download an infected file, or visit a compromised website
- The ransomware installs silently and begins encrypting files in the background
- Once encryption is complete, a ransom note appears on your screen with payment instructions and a deadline
- If you don't pay within the deadline (usually 48-72 hours), the attacker threatens to double the ransom or delete the decryption key permanently
A typical ransom note looks like this:
"Your files have been encrypted! To recover your data, you must pay 0.5 BTC to the following wallet address within 48 hours. After 48 hours, the price doubles. After 96 hours, your files will be permanently destroyed. Do not attempt to decrypt files yourself — this will damage them beyond recovery."
Common Infection Methods
Phishing emails: The #1 delivery method. An email with a malicious attachment (.doc, .xls, .pdf, .zip) or a link to a compromised download site. Often disguised as invoices, shipping notifications, or job applications.
Think it might be a scam?
Paste it here for a free, instant verdict.
Free · No signup required · Cmd+Enter to scan
Malicious downloads: "Cracked" software, pirated games, or fake updates for popular programs. Torrent sites are particularly high-risk sources.
Exploit kits: Compromised websites that automatically scan your browser for vulnerabilities and deliver malware without requiring you to click anything (known as "drive-by downloads").
Remote Desktop Protocol (RDP): If you have remote access enabled on your computer with weak credentials, attackers can brute-force their way in and deploy ransomware directly.
Prevention: Backup, Backup, Backup
The single most important ransomware defense is maintaining regular, offline backups. If your files are backed up, ransomware loses its leverage — you can wipe your system, reinstall, and restore from backup without paying a cent.
The 3-2-1 backup rule:
- 3 copies of your important data
- 2 different storage types (e.g., external hard drive + cloud storage)
- 1 copy stored offsite or disconnected from your network
The "disconnected" part is critical. Ransomware encrypts everything it can reach, including connected external drives and cloud sync folders. Your backup drive should be connected only during backup operations, then disconnected and stored separately.
IsThisAScam's 6-layer detection can analyze suspicious email attachments and download links that may deliver ransomware, helping you avoid infection before it happens.
Additional Prevention Steps
- Keep your OS and software updated — most ransomware exploits known vulnerabilities that patches have already fixed
- Use reputable antivirus/anti-malware software — Windows Defender (built into Windows) provides solid baseline protection
- Don't open unexpected email attachments — even from people you know (their account may be compromised)
- Disable macros in Office documents by default — macros in Word and Excel documents are a primary ransomware delivery vehicle
- Enable "Show file extensions" in Windows — a file named "invoice.pdf.exe" is malware, not a PDF, but you can't tell without seeing the extension
- Use an ad blocker to prevent malvertising-based infections
- Disable Remote Desktop Protocol if you don't need it, or protect it with a VPN and strong authentication
If You're Infected: What to Do
- Disconnect immediately. Unplug ethernet, turn off WiFi. This prevents the ransomware from spreading to other devices on your network or encrypting cloud-synced files
- Don't pay the ransom. Payment doesn't guarantee you'll receive a working decryption key. It funds criminal operations and marks you as someone willing to pay (leading to future targeting). The FBI advises against paying
- Identify the ransomware variant. Upload a ransom note or encrypted file sample to nomoreransom.org — a collaborative project by law enforcement and security companies. If a free decryption tool exists for your variant, it'll be there
- Report to law enforcement. File a report at ic3.gov (FBI) and with local law enforcement
- Restore from backup. If you have clean backups, wipe the infected system and restore. Make sure the backup itself isn't infected before restoring
- If you have no backup, preserve the encrypted files. Free decryption tools for new ransomware variants are occasionally released months later by security researchers
For more on protecting your systems, see our guides on securing your phone and browser security extensions.
Received something suspicious? Check it now for free →