I just found and deleted two "HELP_DECRYPT.PNG" files on my business file server. Both were on shared drive root.
I have no anti-virus on my file server. What I did is I search for crypto*.* on this file server, and found nothing.
I also install Malwarebytes and did a "Threat Scan", nothing were found.
Our ~250 business desktop computers all have ESET Endpoint Antivirus installed.
No files seems to be encrypted so far. How is it possible? What should I do?
Thanks!