A cikin yanayin da polymorphic ƙwayoyin cuta, duk da haka, wannan decryption module ne ma modified a kan kowane kamuwa da cuta. A da kyau rubuta polymorphic cutar sabili da haka ba shi da sassa da suka kasance daidai tsakanin kamuwa da cuta, sa shi sosai wuya a gano kai tsaye ta amfani da "alamar". Antivirus software iya gano shi ta hanyar decrypting da ƙwayoyin cuta ta amfani da wani emulator, ko ta hanyar ilimin kididdiga tsari na encrypted cutar jiki. Don ba da damar polymorphic cutar yana da a mutalphic engine (da ake kira "mutating virus engine" ko "mutation engine") inda za a iya yin amfani da wani m hanya domin gane da cewa shi zai iya aiki a hankali a lokacin da scraping da ƙwayoyin cuta ko yin amfani da wani m hanya da za a iya yin amfani da wani polymorphic ƙwayoyin cuta ko ƙwayoyin cuta. "Wannan tambaya tana da muhimmanci ga masu sana'a na bincike na ƙwayoyin cuta, saboda yana da wuya a gane cewa akwai irin wannan nau'in ƙ
polymorphic