Malicious Emails

'Urgent Invoice' - How to Spot Malicious Emails

One of the skills required in 21st century work-life is the ability of distinguishing legitimate emails from malicious ones. Ignoring hundreds of spam mails every month is one thing but dealing with malware and ransomware attacks that could cost your company millions in damages is an entirely different ballgame.

According to Symantec’s latest Internet Security Threat Report, 55 percent of emails received by employees in 2018 were categorized as spam and 1 in 412 emails was considered malicious, i.e. potentially harmful.

The following chart, based on Symantec’s findings, shows which subjects, attachments and keywords are most often used in malicious mails and should be considered red flags to vigilant employees.

Description

This chart shows the top subjects, attachment types and keywords used in malicious emails in 2018.

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Industries with the highest number of detected malware attachments received via email worldwide in 2021
Distribution of malicious e-mails reported by employees worldwide in first quarter 2023, by type
Most frequently detected malicious file type worldwide in 2024
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Distribution of untrustworthy e-mails reported by employees worldwide in 1st quarter 2023, by type
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Most common malicious file types received globally via web and e-mail in 2025
Accuracy rate of malicious e-mail reporting in worldwide organizations in 2023, by industry

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