A group of hackers is known for past cyberespionage attacks on U.S. Defense Industrial Base. The XSLCmd program is capable of opening a reverse shell, listing and transferring files. The OS X variant can also log keystrokes and capture screen shots. The group, dubbed GREF, is known to have used zero-day exploits for vulnerabilities in browsers and browser plug-ins like Flash Player, Adobe Reader and Java, in the past. GREF has targeted electronics and engineering companies worldwide, researchers say.”]