Malware researchers from Bitdefender Labs reported that Help files are the latest way cybercriminals are locking up PCs with CryptoWall. The Help file format is a highly effective trick to automatically execute malware on a victims machine and encrypt its contents Users werent even attempting to access Help files. Instead, the CHM files appeared as if they were an incoming fax report email from a machine in the user’s domain. Once the infected Help file CHM is opened, the malware downloader goes after the final payload.”]