Ryknos.A is a backdoor that connects to the port 8080 of several IP addresses in order to receive remote control commands to carry out on the affected computer. It can delete, download and run files, for example.
In order to attempt to hide its file, Ryknos.A calls it with a name that begins with the characters $SYS$. It does this in order to take advantage of the fact that, in computers in which the Digital Rights Management software from Sony is installed, the rootkit included in that software hides every file whose name begins with those characters from the Windows Explorer, etc.
Ryknos.A does not spread automatically using its own means. It needs an attacking user's intervention in order to reach the affected computer. The means of transmission used include, among others, floppy disks, CD-ROMs, email messages with attached files, Internet downloads, FTP, IRC channels, peer-to-peer (P2P) file sharing networks, etc.>