OSX.Wirelurker

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Discovered: November 06, 2014
Updated: November 06, 2014 9:52:31 PM
Type: Trojan
Systems Affected: Mac

OSX.Wirelurker is a Trojan horse that may steal information from compromised devices. It may spread to connected iOS devices through compromised computers.

Antivirus Protection Dates

  • Initial Rapid Release version November 06, 2014 revision 017
  • Latest Rapid Release version May 31, 2016 revision 036
  • Initial Daily Certified version November 06, 2014 revision 020
  • Latest Daily Certified version June 01, 2016 revision 005
  • Initial Weekly Certified release date November 12, 2014

Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.


Technical Description

The Trojan may be downloaded through pirated applications from third-party app stores or by connecting an iOS device to a compromised OS X computer.

When the Trojan is created, it creates the following file:

  • /tmp/machook.log
  • /tmp/sms.db
  • /tmp/AddressBook.sqlitedb

The Trojan may inject the following file into other iOS applications:
  • /usr/bin/stty5.11.pl

The Trojan may contact the following malicious domain and send reports back to it:
  • [http://]www.comeinbaby.com

The Trojan may perform the following actions:
  • Download updates of itself
  • Check if the attached iOS device is jailbroken
  • Spread to other iOS applications
  • Detect if a USB device has been added or removed

The Trojan may back up the following iOS applications if they are found on the compromised device:
  • com.taobao.taobao4iphone
  • com.alipay.iphoneclient
  • com.meitu.mtxx

The Trojan may steal the following information from the compromised device:
  • Serial number
  • Phone number
  • Model number
  • Product version
  • AppleID
  • Product type
  • Hardware serial number
  • Installed applications
  • First name
  • Last name
  • Contact information of received text messages

Recommendations

Symantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":

  • Use a firewall to block all incoming connections from the Internet to services that should not be publicly available. By default, you should deny all incoming connections and only allow services you explicitly want to offer to the outside world.
  • Enforce a password policy. Complex passwords make it difficult to crack password files on compromised computers. This helps to prevent or limit damage when a computer is compromised.
  • Ensure that programs and users of the computer use the lowest level of privileges necessary to complete a task. When prompted for a root or UAC password, ensure that the program asking for administration-level access is a legitimate application.
  • Disable AutoPlay to prevent the automatic launching of executable files on network and removable drives, and disconnect the drives when not required. If write access is not required, enable read-only mode if the option is available.
  • Turn off file sharing if not needed. If file sharing is required, use ACLs and password protection to limit access. Disable anonymous access to shared folders. Grant access only to user accounts with strong passwords to folders that must be shared.
  • Turn off and remove unnecessary services. By default, many operating systems install auxiliary services that are not critical. These services are avenues of attack. If they are removed, threats have less avenues of attack.
  • If a threat exploits one or more network services, disable, or block access to, those services until a patch is applied.
  • Always keep your patch levels up-to-date, especially on computers that host public services and are accessible through the firewall, such as HTTP, FTP, mail, and DNS services.
  • Configure your email server to block or remove email that contains file attachments that are commonly used to spread threats, such as .vbs, .bat, .exe, .pif and .scr files.
  • Isolate compromised computers quickly to prevent threats from spreading further. Perform a forensic analysis and restore the computers using trusted media.
  • Train employees not to open attachments unless they are expecting them. Also, do not execute software that is downloaded from the Internet unless it has been scanned for viruses. Simply visiting a compromised Web site can cause infection if certain browser vulnerabilities are not patched.
  • If Bluetooth is not required for mobile devices, it should be turned off. If you require its use, ensure that the device's visibility is set to "Hidden" so that it cannot be scanned by other Bluetooth devices. If device pairing must be used, ensure that all devices are set to "Unauthorized", requiring authorization for each connection request. Do not accept applications that are unsigned or sent from unknown sources.
  • For further information on the terms used in this document, please refer to the Security Response glossary.


Removal

The following instructions pertain to all current and recent Symantec antivirus products for Macintosh.

  1. Update the virus definitions.
  2. Run a full system scan and repair or delete all the files detected.
For specific details on each of these steps, read the following instructions.

1. To update the virus definitions
Symantec Security Response fully tests all the virus definitions for quality assurance before they are posted to our servers. There are two ways to obtain the most recent virus definitions:
  • Running LiveUpdate, which is the easiest way to obtain virus definitions: These virus definitions are posted to the LiveUpdate servers once each week (usually on Wednesdays), unless there is a major virus outbreak. To determine whether definitions for this threat are available by LiveUpdate, refer to the Virus Definitions (LiveUpdate).
  • Downloading the definitions using the Intelligent Updater: The Intelligent Updater virus definitions are posted on U.S. business days (Monday through Friday). You should download the definitions from the Symantec Security Response website and manually install them. To determine whether definitions for this threat are available by the Intelligent Updater, refer to the Virus Definitions (Intelligent Updater).
The Intelligent Updater virus definitions are available: Read "How to update virus definition files using the Intelligent Updater " for detailed instructions.

2. To scan for and delete the infected files
  • Start your Norton AntiVirus or Symantec Endpoint Protection for Macintosh program and make sure that it is configured to scan all files.
  • Run a full system scan.
  • If any files are detected, click Repair (if available) or Delete.

Writeup By: Roberto Sponchioni