This is a virus detection. Viruses are programs that self-replicate recursively, meaning that infected systems spread the virus to other systems, which then propagate the virus further. While many viruses contain a destructive payload, it's quite common for viruses to do nothing more than spread from one system to another.
This mass-mailing worm masquerades as a Microsoft Security Update patch (named Q216309.EXE) in order to dupe users into executing it.
The worm is intended to be able to mail itself using both Microsoft Outlook and the default SMTP server for the victim machine. However, in testing the worm was buggy, and did not successfully use Outlook to spread.
Once executed, the worm retrieves the default Internet Account details from the Registry, and creates the following keys, writing this data there:
The WINNETW.EXE component of the worm queries two Internet-based email address directories. It parses email addresses from the returned data, writing them to 02_N803.DAT (repeatedly).
The following two Registry keys are set in order to run the worm components:
Upon restarting the machine, BCTOOL.EXE runs, mailing the worm to all the email addresses listed in 02_N803.DAT, using the default SMTP server.
The final component of this worm, GFXACC.EXE, is a backdoor Trojan, opening port 12378 on the infected machine. This component is detected as BackDoor-ABJ by the indicated DATs.
1. Presence of the following files:
2. Port 12378 open.
3. Existence of the following Registry key:
This virus spreads via email masquerading as a Microsoft security update file Q216309.EXE. Executing this file infects the local machine:
The following files are dropped:
Modifications to the Registry are made in order to execute the virus components (BCTOOL.EXE and GFXACC.EXE) at system startup.
Use current engine and DAT files for detection and removal.
Modifications made to the system Registry and/or INI files for the purposes of hooking system startup, will be successfully removed if cleaning with the recommended engine and DAT combination (or higher).
But in some particular cases, the following steps need to be taken.
Please go to the Microsoft Recovery Console and restore a clean MBR.
On Windows XP:
On Windows Vista and 7: