Fake Free Windows 10 Update Notification Spam Comes With Cryptoransomware

Windows 10 has just been released and with all highly-anticipated product releases, cybercriminals are already taking advantage of the hype. Recently our engineers here at Trendlabs spotted a spam mail making the rounds, one pretending to be an email notification for a free update of Microsoft's latest OS. And as with all malicious socially-engineered spam, it comes with a dangerous attachment, namely a zipped archive full of cryptoransomware. Specifically, CTB-Locker. We detect this particular strain as TROJ_CRYPCTB.RUI.

We consider this particular attack highly dangerous due to its payload, which will encrypt all files found in the system it infects and render them unusuable. Users should always take care never to open malicious attachments and/or links from email messages, especially if the sender is an unfamiliar one. 

Trend Micro customers are protected from this threat.

 SPAM BLOCKING DATE / TIME: August 05, 2015 GMT-8
  • ENGINE:8.0
  • PATTERN:1726