So my pal sent me a notice about a virus which will encrypt all of your personal files (pictures, office docs, videos, etc). You will not get them back without paying $100-700 USD within 72 hours. It might be nice to warn your customers about opening unknown attachments. Offer them a scanning service for extra $$; and offer them data backup so they can access files after they get the virus.
Norton has a page about it here.
So does MalwareBytes.
How To Avoid CryptoLocker Ransomware. "This thing hit like pretty much all the file extensions that are usable, from Mp3s to [Microsoft] Word docs,” Kessel said. “About the only thing it didn’t touch were system files and .exe’s, encrypting most everything else with 2048-bit RSA keys that would take like a quadrillion years to decrypt. Once the infection happens, it can even [spread] from someone on a home PC [using a VPN] to access their work network, and for me that’s the most scary part."
Another reminder: Win XP updates expire soon so all those computers will be subject to a huge amount of exploits, malware, etc. Jump on that too.