The vast majority (82 percent) of users open email attachments if they appear to be from a known contact, despite the prevalence of well-known sophisticated social engineering attacks, according to Glasswall.

Of these respondents, 44 percent open these email attachments consistently every time they receive one, leaving organizations vulnerable to data breaches sourced to malicious attachments.

Altogether, the survey examined 1,000 office workers in medium and large-scale businesses across the U.S. to determine their email security awareness, particularly regarding known and unknown attachments, and related behaviors around best practices.