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Adobe flash player upgrade mac update#
Adobe flash player upgrade mac code#
Adobe flash player upgrade mac mac#

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.

Adobe flash player upgrade mac mac#

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.

Adobe flash player upgrade mac update#

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”:Ĭopyright © 2016 ironSource. 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. But what they have done is make the disguise even more convincing by somehow duping Apple into approving their code as legitimate.Īccording to Wardle, once he notified Apple about the problem it was quick to revoke the certificates of the offending app – and thus remove the notarization status.Malware + Recommended + Security News Mac Users Attacked Again by Fake Adobe Flash Update When I first wrote about Shlayer in January 2019, it was posing successfully as a Flash Player update and it seems that the criminals behind the attacks haven’t felt any need to change that.

Again, due to their notarization status, users will (quite likely), fully trust these malicious samples.Īnd you know what’s worse? The malicious content contained within this fake Adobe Flash Player update is not some brand new breed of malware, but instead a version of Shlayer – a worryingly-common infection which has dominated the Mac malware charts since 2019.

Now notarized, these malicious payloads are allowed to run …even on macOS Big Sur.

Apple scanned and apparently detecting no malice, (inadvertently) notarized them.

These malicious payloads were submitted to Apple, prior to distribution.

However, in this case, the malicious code had actually received Apple’s stamp of approval. Normally, a lack of notarization should mean that the app cannot be run on users’ Mac computers and laptops. Security researchers Patrick Wardle and Peter Datini have uncovered an adware campaign hosted on a website that tricked users into downloading a bogus update to Adobe Flash Player. Unfortunately, that seems to be exactly what has happened. Might users have a false sense of security – believing that if Apple’s vetting has given an app the all-clear and no message is displayed on running, that it must be safe to run? That’s all great in theory, but what if Apple accidentally approves a malicious app. If an app isn’t notarized, you’re prevented from running it on macOS. It’s different from a regular “app review” of the software, and since February 2020 it has become a requirement for even Mac software distributed outside the Mac App Store to be notarized by Apple to allow it to run on macOS Catalina, the latest shipping version of the Mac operating system. A really cool feature of Apple macOS, from the security point of view at least, is that all software distributed via the Mac App Store has to be checked by Apple for malicious content – a process known as “notarizing.”