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Arch Linux Now Believes Malware Incident Under Control: More Than 1,500 Affected Packages
(www.phoronix.com)
This is a most excellent place for technology news and articles.
Have a check if you updated it recently (PKGBUILD history, about June 10-12). If not you're fine.
If:
(reference)
Personally I would reset everything if I got anything, to kill both any infection and my paranoia. Then reset credentials.