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The best advice for many users may be to ensure that you have configured Adobe Flash Player to automatically update itself - while retaining the option to trigger manual updates if you canвЂ™t wait for Adobe to get around to updating your system.

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Ultimately the only safe place to get your Adobe Flash Player update is from Adobe itself, and if you are uncertain - read our guide on how to tell if an Adobe Flash update is valid. Is it possible that the security of all OS X users is being put at risk because some developers are blind to the threat of their own Macs being attacked, and are carelessly allowing themselves to be hacked and confidential certificates to be stolen? There is a certain irony that security professionals have devoted a lot of time in warning the general public about the importance of installing patches and keeping their Flash installations updated, only to see online criminals exploiting the situation by launching their own attacks as warnings that Flash needs to be updated.

The seemingly never-ending advisories from Adobe about newly-discovered security holes in Flash Player have made critical updates a regular occurrence.

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There are a variety of ways to exploit security holes in OS X Gatekeeper to allow malicious code to sneak onto computers, but presently it seems the simplest method of all is to sign your code with a developerвЂ™s certificate.ДЄll of which raises the question - from where are the attackers getting their valid Apple developer certificates?ДЄ definite possibility is that some OS X developers are being too careless with their own security, and not recognising the need to properly protect their certificates from hackers.ДЄt the time of writing, the compromised Apple developer ID certificate (MDK7FNV856, in the name of one Nikolay Nikolay Lastovka) has not been revoked. 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 вЂњidentified developers.вЂќД«y 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 XвЂ™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.

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Intego researchers report that third-party apps they have seen being installed by the fake Adobe Flash update include MegaBackup, ZipCloud, and MacKeeper.Д®mbedded within the installerвЂ™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 вЂњturning a blind eye to malwareвЂќ:Д¬opyright В© 2016 ironSource. However, if the Package installer is located in the DMG volume, then you will be prompted toВ continueВ the installation.ДЄs 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 XвЂ™s built-in Gatekeeper security to believe that the files can be trusted and are not malicious.Д¬uriously, if theВ Mac Package installer, called Product.pkg, is located outside the DMG volume and the DMG volume Installer is unmounted, then youВ will receive a вЂњMissing parametersвЂќ 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. Malware + Recommended + Security News Mac Users Attacked Again by Fake Adobe Flash Update