Where did you get it from?
You might want to know that most of these programs that are 'very similar to Shareaza', are only copies of Shareazas code and contain backdoor programs, virusses, trojan horses etc. Therefore, it is not advisary to run any Shareaza mod (except for Shareazaplus, which is an official and 100% clean mod) if you are not able to verify it being clean of such rubbish inside.

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I don't remeber where I got it from, but a possible source is:Sharetastic - GoForSharing

It's most probably based on the shareaza code.

As to malware, its documentation states explicitly: "NOTE: Sharetastic does NOT include spyware and adware!".

So, the puzzle stays unsolved. I have very good experience with shareaza and keep using it, but, still, am puzzled about this newly made kin.