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Adware.Mac.InstallCore.1

Added to the Dr.Web virus database: 2015-05-13

Virus description added:

An installer of unwanted applications that targets OS X. It contains three main folders

bin
MacOS
Resources

The bin folder encompasses an application detected by Dr.Web anti-virus as Tool.Mac.ExtInstaller. It serves the purpose of installing add-ins for browsers, changing the home page or the search engine used by default. The MacOS folder contains the binary file of the installer; the Resources folder includes the main part of SDK in the form of JavaScripts. These scripts can be either encrypted with the AES algorithm or not.

The main configuration file config.js resides in the Resources\skin\script\ folder and looks as follows:

var appInfo = {
	scheme : 'MacMPlayerX',
	channel : '',
	account : 'MPlayerX',
	product_id : 'MPlayerX',
	report : 'http://rp.yameyepe.com',
	ad_url : 'http://os.yameyepe.com/MacMPlayerX/?v=5.0',
	img_base_url : 'http://img.yameyepe.com/img/',
	isdlm : true,
	terms_url : '',
	privacy_url : '',
	eula_url : '', // will only be used if this is a DLM
	ad_timeout : 4000,
	requires_root: false,
	root_if_installed : [ '' ],
	name : '',
	title : '',
	ad_timeout : 4000,
	style : 'pkg',
	language : 'EN',
	useOSLang : true,
	disableConfirm : false,
	window: {
		width : 764,
		height : 500
	},
	//used by pkg types
	logo : {
		x : 1,
		y : 47,
		width : 186,
		height : 140
	}
};
var prodInfo = {
	title : 'MPlayerX',
	package_id : 'MPlayerX',
	package : 'http://cznic.dl.sourceforge.net/project/mplayerx-osx/MPlayerX-1.0.22.1.zip',
	mountOnly : '',
	root_if_installed : 'org.niltsh.MPlayerX',
	type : 'install',
	preinstall: '',
	app_name : 'MPlayerX'
};
var offersInfo = {
	max_offers : 0,
	vmcs : {},
	cancels : [],
	offers : []
};

The offersInfo section contains the following parameters:

  • max_offers—maximum number of applications to be installed
  • vmcs—the list of virtual machines, whose presence prevents from the installation of additional programs
  • cancels—applications, whose presence prevents from the installation of additional programs
  • offers—the list of applications to be installed

This configuration file is not the only one the program uses for its operation. Another file is received from the remote server, whose address is specified in the “ad_url” field of the local configuration file. A POST request is forwarded to this address. In return, the malware receives the encrypted package that looks as follows:

struct st_encrypted_packet
{
  _BYTE data[];
  _BYTE signature; // 0xFE
  _DWORD datalen; // sizeof(data)
  _DWORD xorkey;
}

Data downloaded from the network is encrypted with the XOR algorithm and compressed using GZIP. The decrypted file contains various data and language parameters necessary for the correct display of the interface elements.

The file Resources\skin\script\scripts.js is used to detect the presence of virtual machines

...
var disableVM = false;
...
function runningFromVM() {
        var result = false;
        var macAdress = mciapiEnvironment.macAddressString();
        var vmMacAdressPrefixes = ['001c42', '080027', '000c29', '000569', '001c14', '005056'];
        for (var i = 0; i < vmMacAdressPrefixes.length; i++) {
                var vmMacAdressPrefix = vmMacAdressPrefixes[i];
                if (macAdress.indexOf(vmMacAdressPrefix) == 0) {
                        result = true;
                        break;
                }
        }
        return result;
}

The malware will not urge the user to install additional programs if it runs on VirtualBox, VMWare Fusion, or Parallels or if either a development environment package XCode or the Charles application used for debugging is detected. There have been some cases, when the unwanted application did not prompt the user to install additional programs if one of the following anti-viruses was detected: AVG, Avast, BitDefender, Comodo, ESET, Kaspersky, Sophos, Symantec, Intego, ClamAV, or F-Secure.

The installer file can have one of the following digital signatures:

Developer ID Application: Ben Werthaouf
Developer ID Application: Adlogica, Inc.
Developer ID Application: Sylvester Andrews
Developer ID Application: Javier Griffin
Developer ID Application: Zongyao Qu
Developer ID Application: Darrel Cannon
Developer ID Application: RealNetworks, Inc

The following list presents some programs and utilities, which Adware.Mac.InstallCore.1 can install on the system:

  • Yahoo Search
  • MacKeeper (Program.Unwanted.MacKeeper)
  • ZipCloud
  • WalletBee (Adware.Mac.DealPly.1)
  • MacBooster 2 (Program.Unwanted.MacBooster)
  • PremierOpinion (Mac.BackDoor.OpinionSpy)
  • RealCloud
  • MaxSecure
  • iBoostUp
  • ElmediaPlayer

News about this program

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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  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

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