Kaspersky Announces Free Website to Check Your Mac for Widespread Virus

10 Apr 2012

Kaspersky Lab’s experts recently analyzed the Flashfake botnet and found a total of 670,000 infected computers worldwide, with more than 98% of the computers most likely running Mac OS X, and most located in the United States. This is the largest Mac-based infection ever.  Kaspersky Lab has today announced a free website and disinfection tools where users can check their machines, and remove the virus if necessary.

How to determine if your computer is infected:

  • Visit Kaspersky Lab’s site at www.flashbackcheck.com to determine if you’re infected.
  • This dedicated site is safe for users to visit and enter their computer’s UUID, which will be checked in Kaspersky Lab’s Flashfake database of infected computers. Instructions for entering user UUIDs are included as well.

How to disinfect your computer:

If your UUID is found in our database, you need to disinfect your Mac. Here are two recommendations to do this:

  1. Use a free special utility, the Kaspersky Flashfake Removal Tool. It will automatically scan your system and remove      Flashback if it is detected. This is a free-to-download and free-to-use program.
  2. Download a trial version of Kaspersky Anti-Virus 2011 for Mac. This program offers comprehensive protection against all known malicious programs for Mac OS X, including Flashback.

For general tips about enhancing your Mac’ security settings, please read our latest article: “10 Simple Tips for Boosting the Security Of Your Mac

Background Summary on Flashfake

Throughout the previous weekend, Kaspersky Lab experts have seen a decline in the number of infected computers (known as “bots”) for Flashfake: on April 6 the total number was 650,748. At the conclusion of April 8 the number of active bots was 237,103; however, the decrease in infected bots does not mean the botnet is rapidly shrinking. The statistics represent the number of active bots connected to Flashfake during the past few days – it is not the equivalent of the exact number of infected machines. Infected computers that were inactive during the weekend would not be communicating with Flashfake, thus making them not appear as an infected bot.

The United States had the most infected computers (300,917) followed by Canada (94,625), the United Kingdom (47,109) and Australia (41,600). Other infected countries included France (7891), Italy (6585), Mexico (5747), Spain (4304), Germany (4021) and Japan (3864). 

On April 6 Kaspersky Lab’s researchers reverse-engineered the Flashfake malware and registered several domain names which could be used by criminals as a C&C server for managing the botnet. This method enabled them to analyze the communications between infected computers and the C&Cs.  By connecting to Flashfake, Kaspersky Lab’s experts are able to continuously monitor the botnets communication with active bots and have published their findings (post by Alexander Gostev, Chief Security Expert, Kaspersky Lab).