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- VALID
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-
- Valid is a non-resident virus, written in BASIC which works by
- renaming the !Run file of the application to "Valid", then
- saving itself as a file called "Source" and creating a new !Run
- file which points to the virus code. Both have correct filetypes.
- I found it in my !System dir on my Hard Disc. This was the only
- place it had infected. But on a floppy based system this virus
- causes a noticeable slowdown when it infects an application, as
- it uses OSCLI command EnumDir to create a list of applications
- to infect. This list is saved as a file, and then loaded into
- some reserved memory. When the processing of this data is finished,
- the file is deleted. Valid does little besides replicate, but
- does create a 0 byte file called "Infected!" in the application
- directory after any 22nd in any month.
-