Because rootkits hide deep within the operating system, standard antivirus programs might miss them if they aren't looking for kernel-level hooks.
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The Netfilter rootkit (sometimes dubbed "Retliften" by Microsoft) is a sophisticated piece of malware that primarily targets Windows systems through a malicious driver. Because rootkits hide deep within the operating system,
Fast Insights for a Microsoft-Signed Netfilter Rootkit - Intezer malware-cnc netfilter rootkit download attempt