Trend micro lists 3 variants of the blaster & a trojan
http://www.trendmicro.com/vinfo/virusencyclo/default5.asp?VName=WORM_MSBLAST.A
http://www.trendmicro.com/vinfo/virusencyclo/default5.asp?VName=WORM_MSBLAST.B
http://www.trendmicro.com/vinfo/virusencyclo/default5.asp?VName=WORM_MSBLAST.C
http://www.trendmicro.com/vinfo/virusencyclo/default5.asp?VName=TROJ_MSBLAST.DRP
http://www.trendmicro.com/vinfo/virusencyclo/default5.asp?VName=WORM_MSBLAST.GEN
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