Threat Explorer

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OSX.Dockster

OSX.Dockster

Discovered:
December 09, 2012
Updated:
December 10, 2012
Also Known As:
OSX.Flashback [Symantec]
Infection Length:
241,621 bytes
Systems Affected:
Mac
OSX.Dockster is a Trojan horse that opens a back door on the compromised computer.

Note: Virus definitions dated December 9, 2012 or earlier detect this threat as OSX.Flashback .

Antivirus Protection Dates

  • Initial Rapid Release version December 10, 2012 revision 001
  • Latest Rapid Release version February 19, 2013 revision 016
  • Initial Daily Certified version December 10, 2012 revision 003
  • Latest Daily Certified version February 02, 2013 revision 007
  • Initial Weekly Certified release date December 12, 2012
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.
When the Trojan is executed, it copies itself to the following location:
$HOME/.Docset

It then registers itself in LaunchAgent using the following file so that it runs when the computer starts:
$HOME/Library/LaunchAgents/mac.Dockset.deman.plist

The Trojan then opens a back door on the compromised computer by connecting to the following location on TCP port 8088 and awaits commands from the remote attacker:
itsec.eicp.net

The Trojan may receive commands to perform the following actions:
  • Log keystrokes
  • Download a remote file
  • Open shell commands
  • Delete itself

      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.
      MANUAL REMOVAL
      The following additional 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: Takashi Katsuki