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Posts Tagged ‘botnet’
April 15th, 2013

WordPress sites hacked

wordpress-logoThere is a nasty botnet trolling WordPress sites trying to log in with the default admin user name and using “brute-force” methods to crack the passwords. Our advice to save your wordpress blog from being hacked is to change admin as the login name to something else and use strong passwords.

Matt Mullenweg, the founder of WordPress, advises the same thing on his blog. He also said to turn on the two-step authentication, which prompts you to enter a secret number you get from the Google Authenticator App on your smartphone. To make as secure an environment as you can, ensure that the latest version of WordPress is installed as well.

“Do this and you’ll be ahead of 99% of sites out there and probably never have a problem,” Mullenweg writes to assure 64 million WordPress users.

April 24th, 2012

avast! Free Antivirus for Mac and the Flashback botnet

Mac computers running the beta version of avast! Free Antivirus for Mac were not infected by the Flashback Trojan.

“We’ve confirmed our app’s detection abilities for Flashback within the test lab and with reports from our beta testers,” says Jiri Sejtko, director of AVAST Virus Lab operations.

The Flashback Trojan linked to the Mac botnet is a derivative of last year’s DevilRobber Mac OS X Trojan. The AVAST Virus Lab now has 18 variants of this malware in its antivirus database.

“With an estimated 600,000 infected Macs, this botnet is just a large example that the Apple operating system is not immune from malware,” said Jiri. “Add a growing market share that makes Mac an attractive target for the bad guys together with a user base that insists they do not need a security app – you have all the conditions in place for an epidemic to rip through.”

The latest Flashback variants can infect vulnerable Macs without requiring the victim to enter a password. “Mac malware has historically been dependent on social engineering – convincing the user to enter the required password. Now these days are over and Mac users can pick up malware just by visiting an infected website,” adds Jiri. “Welcome to the real world.”

Flashback is a logical step in Mac malware’s steady evolution, he points out. Initial malware samples were rather simple, just compiler-generated code, with no encryption whatsoever, but it has since evolved to be more “custom”, with encrypted strings and code, and structured to avoid security apps like LittleSnitch(firewall software for Mac OS) or Apple’s XProtect. During 2011, there were some large-scale attempts to spread Mac malware via Google Image poisoning.

“It takes 1-2 years for malware guys to adapt to a new technology – it took a similar time when they switched from DOS to Windows. This latest botnet did not fall out of the clear blue sky. The conditions have been building for some time and I’m glad that our security app will soon be available for Mac users,” says Jiri.

avast! Free Antivirus for Mac is currently in the late  BETA stage. It includes the latest avast! antivirus engine, three shields (Web, File, and Mail) and the WebRep reputation and anti-phishing plugin for Safari browser. avast! Free Antivirus for Mac builds on the AVAST Software tradition of providing a full-fledged security app which is completely free. More details coming very soon.

Categories: Mac, Uncategorized, Virus Lab Tags: ,
April 10th, 2012

Risky gaming with ZeuS and WordPress

Assassinscreedfrance.fr, a French fan site for the wildly popular computer game, is still infected.

For over 8 weeks, the site has been infected with a Trojan java script redirector that sends visitors to a Russian malware site and connects them to a ZeuS powered botnet. The infection was last confirmed by the AVAST Virus Lab at 12.00 CET, April 10, 2012. And, just to make it clear, this Assassinscreedfrance.fr site is not affiliated with Ubisoft, the developers of the Assassin’s Creed franchise.

So far, avast! has blocked over 179,800 visits by its users to this site. And, Assassinscreedfrance.fr is just one of 1,841 sites around the globe that has been infected with this specific Trojan during the month of March.

Powered by variants of the ZeuS Trojan, this collection of botnets has stolen over $100 million from small and medium-sized businesses.

The infection, a Trojan redirector, sends users to Russian malware distribution server with an IP registered in Saint Petersburg, Russia. And yes, this sever is still working, even after Microsofts’ recent takedown of a few dozen botnet servers. Read more…