The Sexer.b worm spreads via the Internet as an infected email attachment file named, KAVUtil.exe.
Sender address: firstname.lastname@example.org
File attachment: KAVUtil.exe
Sexer then creates the file KAV.bmp in the Program Files\Common Files\system directory. The system then installs this file as the desktop background image.
Sexer then sends itself out to all the email addresses found in the email client's address book.
To physically mail itself, Sexer makes a direct connection with the SMTP server.
Please, go to the key in the system registry: HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
and delete the value: KAVUtil = kavutil.exe