Sorry for asking all this questions but does AVEST delete Hacktool.Rotkit?
avast doesn’t have an anti-rootkit function as such and when established rootkits are hard to detect. If however avast is able to detect a number of rootkits before they get established and hidden. I don’t know specifically if hacktool is one of those it can detect as there is no convention/standardisation on malware names.
I suggest you visit this page http://www.antirootkit.com/software/index.htm for antirootkit detection, removal & protection.
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