 The purpose of this study was to investigate the effectiveness of antivirus software against various evasion techniques used by cyber criminals. The results showed that the latest versions of antivirus software were able to detect and block most of the evasion techniques tested. However, some of the more advanced techniques were still able to evade detection. Additionally, the authors demonstrated how easy it is to modify existing evasion techniques to make them even more effective at bypassing antivirus software. This paper serves as a warning to internet users to be aware of the potential dangers posed by cyber criminals who employ evasion techniques to avoid detection. This article was authored by Dominik Samosiak.