Trojan Horse Generic18.AZBB

Hi guys, I am new to this fourm. I have a licensed copy of Norton Anti-Virus with everything being up to date. I also have an old copy of AVG that , from time to detects the virus: Trojan Horse Generic18.AZBB.  Norton Antivirus does not appear to have this in it's definitions and seems to be oblivious to it..  Should I be concerned?  Why does Norton Antivirus not have this in it's Threat List.

 

Thanks

 

John / Sydney / Australia