"An identity-stealing keylogger that disguises itself as a
Firefox extension and installs silently in the background was
discovered Tuesday by security vendor McAfee.
"According to the Santa Clara, Calif.-based company, the
'FormSpy' Trojan horse monitors mouse movements and key presses to
steal online banking or credit card usernames and passwords, other
login information, and URLs typed into Firefox, the popular
open-source browser. Another component of the Trojan sniffs out
passwords from ICQ and FTP sessions, and IMAP and POP3 traffic,
said McAfee. All collected information is sent to an IP address
hard-coded into the Trojan..."