Code in huge ransomware attack written to avoid Russian computers

The computer code behind the massive ransomware attack by the Russian-speaking hacking ring REvil was written so that the malware avoids systems that primarily use Russian or related languages, according to a new report by a cybersecurity firm.

It's long been known that some malicious software includes this feature, but the report by Trustwave SpiderLabs, obtained exclusively by NBC News, appears to be the first to publicly identify it as an element of the latest attack, which is believed to be the largest ransomware campaign ever.