Cyber Risks · Cisco Talos

Threat Spotlight: Mighty Morphin Malware Purveyors: Locky Returns Via Necurs

Summary: Cisco Talos observed the first large-scale Locky ransomware campaign in months on April 21, distributed through the Necurs botnet, with more than 35,000 emails seen in a matter of hours. The campaign used PDF attachments with embedded Word documents whose XOR'd macros downloaded the Locky sample from a likely compromised website, a delivery technique recently used to distribute Dridex.

Why it matters: The PDF-with-embedded-Word-document chain requires the user to click through a pop-up before the macro runs, which defeats sandboxing technologies that do not allow user interaction and raises the odds the payload reaches an end user's mailbox.

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Topics
Malware
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