[AccessD] .ace file malware found in Office 365

[John Bartow]

"For several weeks, we detected (and blocked) an attack targeting one of the largest municipalities in the U.S. that bypassed Office 365 default security, using a simple yet extremely devastating form of malware contained in an .ace file."

ACE Archives: Microsoft finally closes hole that allowed trojans to bypass Office 365 default security https://www.avanan.com/resources/ace-attack