ZDNET – “Microsoft has issued an alert over a remote access tool (RAT) dubbed RevengeRAT that it says has been used to target aerospace and travel sectors with spear-phishing emails.  RevengeRAT, also known as AsyncRAT, is being distributed via carefully crafted email messages that prompt employees to open a file masquerading as an Adobe PDF file attachment that in fact downloads a malicious visual basic (VB) file.  Security firm Morphisec recently flagged the two RATs as part of a sophisticated Crypter-as-a-Service that delivers multiple RAT families…”