Can browser extensions for chrome and firefox that remove ads contain malware?

Question

Google Chrome

I noticed that recently, when clicking on some links, instead of a direct transition, something like was slipping.

By googling, I found what it was. I started to install the programs recommended in the articles and scan. AdwCleaner did not find anything interesting, but Spyhunter 4 found several trojans, including RuJack and two others, and most interestingly, they were (according to the report) inside Ublock Origin, Adguard and Ghostery, respectively.

I took them down and the problem with r.srvtrck.com disappeared, but with what was left (Adblock Plus + Stylus + Tamprmonkey RuAdlist JS), the ability to block some ads disappeared, Yandex.direct again climbed from everywhere, in particular (Ublock, together with Adguard, cut off 99 .99%).
The question is, is this malware - if it is, of course, really malware and not SpyHunter paranoia - a component of the extensions downloaded from the store or were they infected with something after installation?
UPD: this is AdGuard Beta

This is Ublock Origin

Answer 1

1. Why do you need two ad blocks? Leave only uBlock Origin
2. Suspicious icon with a green shield
2. Clean the system with Malwarebytes

Answer 2

Could it be a fake adblock ?

Answer 3

Any extension can have malware

Answer 4

Perhaps this article will be interesting / useful to you
PS: Maybe, but rarely among popular extensions.