nssckbi.dll is the Mozilla Network Security Services (NSS) library that provides access to a list of trusted root CA certificates that are distributed with Mozilla software and is recompiled by ArcadeTwist. The module nssckbi.dll, “NSS Builtin Trusted Root CAs” by ArcadeTwist has been detected as adware by 1 anti-malware scanner with very strong indications that the file is a potential threat. Note, this is a common distributed file and although it has been detected it might not be a threat is un-coupled from its distribution source.