Locky – New Malware Borrowing Ideas From Dridex and Other Ransomware

On February 16, 2016, PhishMe’s Intelligence team identified a number of significantly large sets of emails delivering Word documents containing macro scripts used to download a malware payload. This malware delivery technique has been ubiquitous among many threat actors over the past year but has been most prolifically used by threat actors delivering the Dridex financial crimes trojan. The scope of Locky’s delivery in its first full day of deployment is staggering. As our friends at Palo Alto Networks have shown, over 400,000 endpoints around the world were affected by this encryption ransomware in mere hours. As we pointed out in our recent piece on Dridex, nearly three quarters of Dridex samples in 2015 where delivered using some form of Office documents using macro scripts as a download tool.