Type your comment> @TazWake said:
Alternate Data Streams have been around for ages, they are a component of the NTFS file system.
If you want to create an ADS, you just push your content to filename.exe:data.
For example
type evilfile.exe > goodtextfile.txt:data
.ADS are most commonly used for the “mark of the web” you see on downloaded files.
thank you