hello! sorry for the confusion, i actually made a mistake at the time of writing the post from a few days ago 😖 -- i have kaspersky free. as for safe torrent scanner, i have reasons to believe it was, in fact, distributing pop-up ads which has lead to attempts of malicious file downloads (although all of them were detected and blocked by kaspersky, luckily). and i felt iffy about installing any more programs to my computer at that point, which is why i settled for manually messing with the registry considering i knew exactly what to do. in any case, it is removed now, and i got the answer to my question (why kaspersky didn't detect it) so thank you!