McAfee has added detection for the WannaCry ransomware malware infections (outbreak pertaining to May 12, 2017) in the new version of McAfee Ransomware Interceptor (MRI v0.5.0.338).
Ransomware malware has evolved to be a tremendous threat over the last few years. Such malware will install on your system, encrypt or damage data on your system in a way that in many cases is irrecoverable unless you have a decryption key. Consumers may have to pay the malware authors hefty amounts of money (varies from a few 100 to a 1000 USD) to obtain the recovery key. Failure to do so typically results in permanent loss of data.
Interceptor is an Anti-Ransomware tool. Interceptor is an early detection tool that prevents file encryption attempts by ransomware malware. This tool leverages heuristics and machine learning to identify such malware.