exactly, there is no perfect software
however, during the ccleaner hack, I did install the infected version on my system and used it for quite a long period. I noticed comodo firewall blocking some random inbound connections, which looked very suspicious
comodo firewall with proper settings might prevent the attack from my side although ccleaner itself might have done something bad, but there might be something else CF can miss
comodo cloud AV, I have seen and bypassed it by myself because of wrong file classification of valkyrie
