A new technique called Zip Concatenation has been developed by hackers to take advantage of the Windows systems.Zip is frequently used to compress and bundle several files into one, which is crucial for file size reduction and simplifying transfers.The technique is simple to set up and invisible to the naked eye. The hack uses the structural flexibility of zip files which makes it an ideal delivery method for evasive viruses.This technique uses a lot of compression and zip-making tools.There are three parts in a zip file structure- File Entries, Central Directory, and End of Central Directory.Open-source 7zip, Winrar, and Windows File Explorer are some of the widely used zip archive readers.Zip concatenation is done by using Linux commands to produce multiple Zip files and combining them into a new zip file.However, 7zip only displays one file and hides the others, which can be extracted during the extraction process.Threat actors are using this technique to deliver their payload unnoticed that can harm the target users.