Skip to main content
Phishing 3 min read

What we Know from the Latest Email Threat Research

Brad Slavin
Brad Slavin General Manager
Updated April 10, 2025

Quick Answer

Mimecast's 2020 Threat Intelligence Report analyzed 195 billion emails between January and June 2020 and found 47% were flagged as malicious or spam. Key trends: attackers focused on monetary gain rather than IP theft; COVID-19-themed campaigns dominated, with vertical-specific lures (healthcare, government, essential services) tailored for industry-specific terminology; ransomware activity rose; file-compression attachments were the dominant delivery format even after Emotet's pause; the majority of attacks were hybridized, mixing techniques; and impersonation detections increased 30% from January to April 2020 as remote work expanded the BEC attack surface. The takeaway: attackers reuse research and templates across verticals, so defenders need email authentication, gateway filtering, and post-delivery scanning, not signature-only tools.

email threat

The latest Threat Intelligence Report is out. Its findings are based on an analysis of 195 billion emails analyzed from January through June 2020. Of that large number, an astonishing 47% were flagged as malicious or spam.

It won’t come as a shock to learn that there were two main themes in the threatening emails this spring. According to HelpNetSecurity, “Two main trends ran throughout the analysis: the desire for attacker’s monetary gain and continued reliance on COVID-19-related campaigns, especially within certain vertical industries.” From the report, “One of the most significant observations of this research is that threat actors are launching opportunistic and malware-based campaigns across multiple verticals at volumes never seen before.”

It’s interesting to note the attackers’ emphasis on verticals, but it does make sense. So much of what threat actors do is to craft targeted emails with industry-specific terminology. After all, they are impersonating an insider. After they do all that research and craft the emails, it only makes sense for them to want to use that information and those emails more than once. And information from the report confirms this.

“Alongside this malicious software, threat actors have increased their sender impersonation efforts, seeking to take advantage of the circumstances of the ongoing pandemic with business email compromise containing multiple forms of social engineering. In fact, researchers found impersonation detections had increased by 30% from January to April 2020. The ongoing pandemic has increased the attractiveness of BEC attacks, so that criminals can take advantage of the circumstances prevailing during the periods of stay-at-home orders across many U.S. states.”

Here are the main findings from the report:

  • Significant attacks came from organized criminal groups for primarily monetary gain, instead of focusing on intellectual property theft.
  • Verticals with “essential” status during the pandemic were repeatedly targeted.
  • Ransomware is on the rise, placing businesses at greater risk of ransomware attack.
  • Attackers choose file compression as their main attack delivery format despite Emotet’s halt in activity.
  • The majority of attacks were hybridized.
  • Impersonation attacks continue to accelerate as threat actors sought to sow confusion during stay-at-home orders.

phishing protection

That’s the bad news. Now for the good news. There’s an easy and inexpensive way to protect yourself and your organization from all these busy threat actors: Phishing Protection from DuoCircle.

Phishing Protection is cloud-based. That means there’s no hardware to buy, no software to buy, no maintenance and it sets up in about 10 minutes. Easy. And it cost just pennies per user per month. Inexpensive.

As the report clearly demonstrates, the attacks are not going to stop. The question becomes, what are you going to do about it? You could do nothing and wait for disaster to strike. Or, you could do just a little bit more than nothing and protect your entire organizations. What are you waiting for?

Brad Slavin
Brad Slavin

General Manager

General Manager at DuoCircle. Product strategy and commercial lead across the email security portfolio.

Secure your email infrastructure

Protect, authenticate, and deliver. Contact our team to find the right solution.