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The small bit of serialized code that my plugin originally put in that file does have an expiration date built into it but all that malicious code that was added to the top of that file has it’s own rules to live by and it needs to be removed before it has a chance to replicate itself into other files. As with all malicious injections, it is important to remove the malicious code as quickly as possible before it can spread to more of the files on your server. Quick containment and isolations is the key to getting clean and staying safe from further infection and future re-infection.
Since all the files in that _SESSION folder are temporary and not critical to the core functionality of your site you can delete the whole folder just to be safe. And session files that are needed to validate future login attampts will be recreated by my plugin anyway, and those will all be clean (at least until you get hit by another wave of infections).
