Researchers from Intel Security noted four times as many instances of macro malware in 2015 compared to last year. Macros are instructions used by some applications, notably Microsoft Word, to get a certain result. The threat was dormant for years, but macro use has recently regained popularity as an infection vector. After executing the macro malware, the malware drops one or more. files onto the victims system, depending upon whether the malware family is Bartallex, Dridex, Donoff or some other downloader. Attackers usually try to obfuscate macro code via functions ranging from character conversion to complex customized encryption.”]
Source: https://securityintelligence.com/news/report-macro-malware-making-a-comeback/