I found this announce.

QUOTE
W32.Feebs
JeremyRuston, 1 March 2007 (created 28 February 2007)

A recent update to Norton's anti-virus software causes it to falsely identify TiddlyWiki files as containing the "W32.Feebs" virus. This is an incorrect report and should be ignored; we're working with Symantec to fix the problem. Check the TiddlyWiki group for more details.


Link:
Tiddly Wiki announce : "W32.Feebs"
Norton Antivirus thinks TiddlyWiki is W32.Feebs | Google groups