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Dublin: 23.10.2014 04.48PM
The once relatively virus-free Apple Mac ecosystem has been tainted forever by a nasty malware scam and you sense an age of innocence has ended. It’s a deadly shock to that ecosystem because now a second variant bug has arrived that requires no password.
The malware first manifested itself when Mac users noticed ads for a product called Mac Defender that promised to protect them against malware and viruses. However, it turned out Mac Defender was actually a piece of malware that becomes active on a desktop after a user is suckered into entering a password, and floods the screen with pop-up pornography sites.
Since then a number of variants – MacGuard, MacSecurity and MacProtector - have arrived.
According to security firm Intego, the goal of this fake antivirus software is to trick users into providing their credit card numbers to supposedly clean out infected files on their Macs.
Intego has discovered a new variant of this malware that functions slightly differently. It comes in two parts.
The first part is a downloader, a tool that, after installation, downloads a payload from a web server. As with the Mac Defender malware variants, this installation package, called avSetup.pkg, is downloaded automatically when a user visits a specially crafted website.
If Safari's "Open ‘safe’ files after downloading" option is checked, the package will open Apple's Installer, and the user will see a standard installation screen.
If not, users may see the downloaded ZIP archive and double-click it out of curiosity, not remembering what they downloaded, then double-click the installation package. In either case, the Mac OS X Installer will launch.
“Unlike the previous variants of this fake antivirus, no administrator's password is required to install this programme. Since any user can install software in the Applications folder, a password is not needed,” Intego said in a warning note.
“This package installs an application - the downloader - named avRunner, which then launches automatically. At the same time, the installation package deletes itself from the user's Mac, so no traces of the original installer are left behind.”
The second part of the malware is a new version of the MacDefender application called MacGuard. This is downloaded by the avRunner application from an IP address that is hidden in an image file in the avRunner application's Resources folder. (The IP address is hidden using a simple form of steganography.) Intego VirusBarrier X6’s Anti-Spyware feature detects this operation:
“Intego considers that the risk for this new variant to be medium, in part because the SEO poisoning has been very efficient in leading Mac users to booby-trapped pages, but also because no password is required to install this variant.”