The difference in GameOver variant is that it opens a random UDP port and sends encrypted packets before sending DNS queries to randomized domain names.”
Configuration files are, as usual, subject to change depending on which information the attackers want to steal, and the malware still tries to prevent browsers from being able to visit security sites. What was previously put in one folder in Windows’%System% folder is now in to random-named folders in the%Applications Data% folder.
“What we can learn from ZeuS / Zbot’s spike in recent months is simple: old threats like Zbot can always make a comeback because cybercriminals profit from these,” the researchers warn and advise: “It is important to be careful in opening email messages or clicking links.