Vred.A is a proof-of-concept virus that is written in script language, that is used by the powerful computer forensics, data recovery, and IT security tool called WinHex.
Here's a screenshot of the WinHex utility:
The virus contains less than 20 commands that allows it to look for all available .WHS (WinHex script) files and to prepend itself to them. As a result all infected scripts stop working until the virus' code is removed from them.
It should be noted that WinHex shows a warning before running any script, so the virus can not replicate without user's interaction:
