Disclaimer: I would never in a k'zillion years dream of illegally using software. This post is hypothetical and is about safety of computer systems. It's up to the individual user to make sure his software is legal. Picture this: You have an external hard drive full of the install files of programs you've downloaded from various sources. However, you run a Malwarebytes scan and it labels a bunch of stuff as malware. However, you're pretty sure much of it is not. For example, KM Service is a tool for activating MS Office '07, '10, or '13 on your own if for some reason you're not able to do so via Microsoft for the software you bought. It's a tool that does not harm systems. However, MBam brands it as "RiskWare." So maybe you've stored a bunch of keygen.exe files so that you can always activate the software you've bought even if there's an apocalypse that destroys all companies, rendering it impossible for you to reinstall and activate the software you've bought. However, Mbam has labeled many of those keygens as "Riskware" or "Trogen.Agents." Regular AV software like Kaspersky doesn't brand them as dangerous. Who's right? Is MBam right that this stuff is malware and Kaspersky's dropping the ball? Or is Kaspersky right and Mbam is overreaching, labeling stuff that's not dangerous as malware?
VirusTotal.com is a site that has 40 virus scanners on line. It's fun to use with a questionable file to learn how many of those engines say "yes", "no" or "maybe".
MS OS's "see" those apps which are not digitally signed by MS as "suspicious" and/or classify them even as Virus, Trojan and so on if those apps in any means altering and/or adding "something" to the system of the OS.Most (nearly all) of them are so called False Positives which could be just ignored. Using VirusTotal for to check the reported files is a way to go if you didn't know already they're harmless. On the other hand, those False Positives are producing a major income for AV Developer Companies.