Threat Explorer

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22 April 2013
Infection Length:
Risk Impact:
Systems Affected:


OSX.Okaz is an adware program that may modify browser homepage and search settings.

Antivirus Protection Dates

  • Initial Rapid Release version 02 October 2014 revision 022
  • Latest Rapid Release version 26 March 2019 revision 003
  • Initial Daily Certified version 18 April 2013 revision 018
  • Latest Daily Certified version 26 March 2019 revision 006
  • Initial Weekly Certified release date 24 April 2013
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.
When the Trojan is executed, it creates the following files:
  • /Library/ScriptingAdditions/SIMBL.osax
  • /Library/LaunchAgents/net.culater.SIMBL.Agent.plist
  • /Library/Application Support/SIMBL/Plugins/SafariOmnibar.bundle
  • /Library/Internet Plug-Ins/zako.plugin
  • /Library/Internet Plug-Ins/uid.plist
  • /Users/[USER NAME]/Library/Safari/Extensions/ChatZumBar.safariextz
  • /Users/[USER NAME]/Library/Application Support/Google/Chrome/Chrome.crx

It then performs the following actions to the Safari, Firefox, and Chrome browsers:
  • Installs a toolbar regardless of user's choice on installation
  • Changes the default search engine and homepage to the following URL:

Next, the Trojan connects to the following URL:
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.