Well I didn't mean to sound like a tosser, but I see your point. As soon as I posted that I went and found some other tools and stuff that lurky had done, alas I had no idea.
I don't mean to insist, but it's not about luksy being famous. IMO what you did is a very anti-open source behaviour. If Aali didn't want his project and his code to be used freely (as in used by the commoners like me, but also modified and/or improved) he wouldn't give all the technical information (the source code). This has been later proved by Aali himself stating "This is exactly the kind of re-use I intended for my code.".
Your reaction would have been legimitate if luksy took all the credits for himself, but he didn't. Far from that, his very first words explicitly give (some/major, your call) credits to Aali. Indeed, the first two words of the original post are : "I rewrote" as in it's based on someone else's work and the third ("aalis") gives you the original author's name.
I didn't have a chance to get to know Aali or luksy, but they seem both highly respectable gentlemen to my eyes : the former for creating an awesome tool plus giving the code, the latter for improving the code plus giving the credit where it is due and both of them for doing all of this for free on their free time (am I overusing the word "free" ?). This is exactly what the open source philosophy is to me.
As for the virus scan, it just isn't your job. Generally speaking, on boards it isn't the duty of the users to do so but of the administrators/moderators. But I won't blame you for being cautious and trying to be helpful.
It seems like you were well-intended and you just overdid things. I hope my post doesn't sound like pure lecturing, I just wanted to give my opinion on that (which can be a valid definition of lecturing, but you know what I mean).