Djvu (STOP) Ransomware: What it is, how it spreads, and how to recover safely

Djvu (STOP) Ransomware

What it is

Djvu - also called STOP - is ransomware that breaks into Windows PCs, encrypts your files, and adds new extensions (often .djvu, .stop, or a variant). A note then demands payment in crypto to unlock them. For details and removal tips, see our 
Djvu ransomware explainer

How it spreads

  • Bundled with cracked “free” software and fake installers

  • Malvertising and deceptive download sites

  • Phishing attachments (archives, scripts) and shady browser extensions

What you may notice

  • Documents/photos won’t open; filenames show a new extension

  • Ransom note files across folders

  • CPU/disk spikes; security tools crash or get disabled

If it hits 

  1. Isolate the PC (turn off Wi-Fi/unplug; disconnect external/network drives).

  2. Keep ransom notes and logs—useful for recovery and investigation.

  3. Check offline backups; rebuild on a clean image and restore data.

  4. From a clean device, change passwords and enable MFA.

  5. Identify the entry point (installer, phish, extension) and block it.

Prevent it

  • Avoid cracks and unofficial download sites; install from trusted sources only.

  • Keep Windows, browsers, and plugins updated.

  • Use reputable EDR/anti-malware and email/web filtering.

  • Maintain offline, tested backups and practice a restore.

  • Train users to spot phishing and fake update prompts.

    Glossary (A–Z)

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