Java virus
How do I know if my mac has the java virus?
iMac (27-inch Late 2009), Mac OS X (10.7.3)
Disable Java in your Browser settings, not JavaScript.
http://support.apple.com/kb/HT5241?viewlocale=en_US
http://support.google.com/chrome/bin/answer.py?hl=en-GB&answer=142064
http://support.mozilla.org/en-US/kb/How%20to%20turn%20off%20Java%20applets
Flashback - Detect and remove the uprising Mac OS X Trojan...
http://www.mac-and-i.net/2012/04/flashback-detect-and-remove-uprising.html
In order to avoid detection, the installer will first look for the presence of some antivirus tools and other utilities that might be present on a power user's system, which according to F-Secure include the following:
/Library/Little Snitch
/Developer/Applications/Xcode.app/Contents/MacOS/Xcode
/Applications/VirusBarrier X6.app
/Applications/iAntiVirus/iAntiVirus.app
/Applications/avast!.app
/Applications/ClamXav.app
/Applications/HTTPScoop.app
/Applications/Packet Peeper.app
If these tools are found, then the malware deletes itself in an attempt to prevent detection by those who have the means and capability to do so. Many malware programs use this behavior, as was seen in others such as the Tsunami malware bot.
http://reviews.cnet.com/8301-13727_7-57410096-263/how-to-remove-the-flashback-ma lware-from-os-x/
http://x704.net/bbs/viewtopic.php?f=8&t=5844&p=70660#p70660
The most current flashback removal instructions are F-Secure's Trojan-Downloader:OSX/Flashback.K.
https://www.securelist.com/en/blog/208193454/Flashfake_Removal_Tool_and_online_c hecking_site
More bad news...