Troj/Daonol-Fam is a family of Trojans for the Windows platform.

Members of Troj/Daonol-Fam typically copy themselves to the Root folder and create some of the following files:

(Root)\(random filename).bat (clean batch file)
(System)\sysaudio.sys

The file sysaudio.sys is also a member of Troj/Daonol-Fam.

A registry entry is usually set similar to the following:

HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Drivers32 aux
sysaudio.sys

Troj/Daonol-Fam attempts to redirect internet traffic from a number of websites.

More information can be found at this Sophos page.