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Adware.Mac.MacInst.1

Added to the Dr.Web virus database: 2015-06-18

Virus description added:

An installer of unwanted and dangerous programs for OS X. It is created using resources of an affiliate program called “macdownloadpro.com”. So far, more than 900 websites are known to take part in distribution of the installer.

The image of Adware.Mac.MacInst.1 has a rather remarkable structure; that is, it contains two hidden folders that cannot be viewed on the computer running with standard operating system settings if the user decides to browse the contents of the DMG file using Finder.

.app
.background
application.app

The directory with the application (in our case, application.app) contains a binary file that launches the installer from “.app\Downloader.app\Contents\MacOS”.

The “.app” folder contains two following subfolders:

.resources
Downloader.app

The “.resources” folder hosts the logo of the application and the encrypted configuration file. Decryption is performed by strings with the seed being reset to its initial value after every string.

The second subfolder contains the installer itself.

Once the installer is run, it demonstrates a dialogue window with the information on the file the user wanted to download.

screen

After the “Next” button is clicked, the malware displays a partnership agreement informing the user that in addition to the file itself some other components will be installed. If the user clicks the hardly visible “Decline” link at the bottom of the window, only the initially chosen file will be downloaded. However, if the “Next” button is clicked, together with the file, the program detected by Dr.Web as Trojan.VIndinstaller.3 will be downloaded and run.

This application, in turn, installs malicious plugins for Safari, Firefox, and Chrome. These extensions are detected as Trojans belonging to the Trojan.Crossrider family. Adware.Mac.MacInst.1 copies all downloaded components into the “~/Library/Application Support/osxDownloader” folder.

Curing recommendations

  1. If the operating system (OS) can be loaded (either normally or in safe mode), download Dr.Web Security Space and run a full scan of your computer and removable media you use. More about Dr.Web Security Space.
  2. If you cannot boot the OS, change the BIOS settings to boot your system from a CD or USB drive. Download the image of the emergency system repair disk Dr.Web® LiveDisk , mount it on a USB drive or burn it to a CD/DVD. After booting up with this media, run a full scan and cure all the detected threats.
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Use Dr.Web Anti-virus for macOS to run a full scan of your Mac.

After booting up, run a full scan of all disk partitions with Dr.Web Anti-virus for Linux.

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  1. If the mobile device is operating normally, download and install Dr.Web for Android. Run a full system scan and follow recommendations to neutralize the detected threats.
  2. If the mobile device has been locked by Android.Locker ransomware (the message on the screen tells you that you have broken some law or demands a set ransom amount; or you will see some other announcement that prevents you from using the handheld normally), do the following:
    • Load your smartphone or tablet in the safe mode (depending on the operating system version and specifications of the particular mobile device involved, this procedure can be performed in various ways; seek clarification from the user guide that was shipped with the device, or contact its manufacturer);
    • Once you have activated safe mode, install the Dr.Web for Android onto the infected handheld and run a full scan of the system; follow the steps recommended for neutralizing the threats that have been detected;
    • Switch off your device and turn it on as normal.

Find out more about Dr.Web for Android