Published Jul 31, 2014 | Updated Sep 15, 2017

Ransom:Win32/Critroni.A

Severe |Detected with Windows Defender Antivirus

Aliases: W32/Kryptik.CGJQ!tr (ESET) Trojan.Win32.Yakes.fkrd (Kaspersky)

Summary

Windows Defender Antivirus detects and removes this threat.
 
This threat locks your files and stops you from using them. It then shows you a message that tells you to pay money to get access to your files again.
 
It can be installed on your PC by Spammer:Win32/Tedroo or by exploit kits. 

There is no one-size-fits-all response if you have been victimized by ransomware. There is no guarantee that paying the ransom will give you access to your files.

If you've already paid, see our ransomware page for help on what to do now.

Run antivirus or antimalware software

The following free Microsoft software detects and removes this threat:

Even if we've already detected and removed this particular threat, running a full scan might find other malware that is hiding on your PC.

Advanced troubleshooting

To restore your PC, you might need to download and run Windows Defender Offline. See our advanced troubleshooting page for more help.

Get more help

You can also visit our advanced troubleshooting page or search the Microsoft virus and malware community for more help.

If you’re using Windows XP, see our Windows XP end of support page.