From 2-spyware.com
Iios file virus spreads around silently and quickly, so the infection isn’t noticed once it’s infiltrating your machine. The threat focuses on file-locking because it is the process that provides a reason for the money demands. File encryption is the process that allows threats to quickly make files useless by altering the original code of the document, image, video file. Markers on encoded files indicate the infection and the name of the ransomware.
You may encounter speed issues or performance problems as a result of this malware’s existence, but there are no other symptoms otherwise. When common files get locked those get marked with a .iios extension. This is when the file-locking is done and the ransom demands get delivered via a text file on the machine.