New mimecast report reveals analysis of 67 billion rejected emails

The Threat Intelligence Report covers the period between April and June 2019 and leverages the processing of nearly 160 billion emails, 67 billion of which were rejected for displaying highly malicious attack techniques.

A significant increase in impersonation attacks was observed, leveraging well-known basic social engineering techniques to target individuals for fast and easy financial gain. Interestingly, the report cites that threat actors are adapting how they engage their targeted victims, initiating through email first, then shifting to SMS, a less secure communications channel. On the other hand, an increasing amount of more complex targeted attacks using obfuscation, layering and bundling of malware were often used. Researchers found that threat actors using these types of attacks are familiarizing themselves with their target’s security environment, then implementing multiple evasion techniques in efforts to avoid detection.