Trojan-Downloader:OSX/Flashback.I is a variant of the Trojan-Downloader:OSX/Flashback malware that connects to a remote site to download its payload; on successful infection, the malware modifies targeted webpages displayed in the web browser.
11 April 2012: F-Secure now provides a free removal tool that automates the detection and removal of Flashback variants from an infected machine.
Further information and download of the tool is available in the following Labs Weblog post:
CAUTION Manual removal is a risky process; it is recommended only for advanced users. Otherwise, please seek professional technical assistance.