Microsoft (NASDAQ:MSFT) Security Intelligence alerted users to a type of ransomware, called Avaddon, that uses Excel 4.0 macros to distribute malicious emails. These emails contain attachments which deploy an attack when opened in any version of Excel.
Avaddon ransomware emerged in early June through a massive spam campaign that randomly targeted its victims. Some patterns seem to indicate that the ransomware mostly targets Italian users.