Are you suggesting that it shouldn't be added to the signature list? Forget the news - that will be the tip off more than anything for the virus makers.
When they 'release a new version', that behaviour can be spotted by the AV companies, and that new version can then be added to the signature list as well.
When they 'release a new version', that behaviour can be spotted by the AV companies, and that new version can then be added to the signature list as well.