Heuristic enables antivirus software to detect new virus/worm because although the virus/worm has made changes in certain virus’s bytes, most of the virus/worm pattern will not change and this thing will simplify antivirus to detect polymorph virus/worm. Visual Basic 6.0 and modified waterfall method was used in this antivirus design. From the design result, this antivirus software can detect new virus/worm that not included yet in viruses signature database that can be observed from the test result. Detection accuracy result without using heuristic was around 61,53% and with heuristic was around 78,85%.
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