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In an attempt to prevent malicious code from infecting OS X computers, by default you are only allowed to run programs that have been downloaded from the official App Store or that have come from "identified developers."īy using a valid Apple developer certificate, the attackers are tricking OS X into believing that their code can be trusted and allowed to execute - with potentially dangerous consequences.

In both this and the previous instance, online criminals signed their malicious code with an Apple developer certificate, allowing the malware to bypass a key part of OS X's built-in defence. Two months ago we described how an earlier version of OSX/InstallCore had been spread after Mac users began to see bogus pop-up warnings about Adobe Flash requiring an update, which resulted in scareware being installed onto their computers. Intego researchers report that third-party apps they have seen being installed by the fake Adobe Flash update include MegaBackup, ZipCloud, and MacKeeper.Įmbedded within the installer's code is a copyright message, referencing an Israeli company that develops the InstallCore software installation platform, and has been criticised in the past for "turning a blind eye to malware": However, if the Package installer is located in the DMG volume, then you will be prompted to continue the installation.Īs a result, victims may find that their OS X computers have had a number of potentially unwanted programs (PUPs) installed on their systems.

pkg file, also known a flat package, and has been signed with a legitimate Developer ID certificate - effectively tricking OS X's built-in Gatekeeper security to believe that the files can be trusted and are not malicious.Ĭuriously, if the Mac Package installer, called Product.pkg, is located outside the DMG volume and the DMG volume Installer is unmounted, then you will receive a "Missing parameters" error.

The in-the-wild attack has been spread in the form of a Mac Package installer.

Intego security experts have identified the rogue package installer as a variant of OSX/InstallCore, and have updated Intego VirusBarrier definitions to provide protection. Mac users are once again being urged to exercise caution when installing updates to Adobe Flash Player, after a fake update was discovered infecting computers.