The Incident Response Report published by F-Secure, an international cybersecurity organization, found that 34 percent of all cyberattacks occur through email.
Of the cyberattacks carried out via email, slightly under half were phishing or spear-phishing attacks, and slightly over half were emails with attachments containing malware.
The report also found that 55 percent of cyberattacks resulted from targeted attacks, and 45 percent were opportunistic attacks. Of all cyberattacks studied, 20 percent were malware infections; 52 percent were social engineering attacks; and 48 percent were external exploits. Ray Schultz "Email-The Leading Factor In Malware Attacks: Report," www.mediapost.com (Feb. 23, 2018).