Cybercriminals’ attack methods are becoming more and more innovative. Currently, a sharp increase in fileless attacks has noticed, which are expertly installed in the victim machine of malicious code, and do not require saving any files to disk first. Malwarebytes data show that the primary tool for criminals infecting computer malware is still the kits exploit. These sets are able to easily use specific, most commonly known errors in software development. However, this method has recently lost its effectiveness – because detection of a file saved on the disk is relatively simple, it is usually a matter of time to identify it and block it by security applications. Fileless attacks are a more complicated process to acquire and provide analysis of a sample of malware. Malwarebytes experts warn that fighting new threats is more complicated. Fileless attacks are not used on a large scale; hackers still rely on traditional methods of providing malicious content. Unfortunately, the growing range of using these tools is worrying, because it was even sporadic a year ago.