Facebook users are receiving malicious email delivering malware masquerading as audio message, a similar campaign also targeted WhatsApp users. Both campaigns used the same subjects of the emails, according to the experts the set of random characters is appended to bypass antispam filters. The malware modifies the Windows Hosts in an attempt to prevent victims from accessing websites of AV vendors, it also attempts to disable Firewall notifications from the Windows Security Center by modifying a Registry entry. Researchers at the Threat Research Lab have identified a very similar phishing campaign.”]
Source: http://securityaffairs.co/wordpress/43859/cyber-crime/facebook-malware-campaign.html