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Deleted member 65228
You can sometimes by looking at other characteristics. Title names, descriptions, versions, update information, user usage count, reviews/ratings, privacy policy/terms of usage present?, profile upload name, etc.I reported all 3 extensions for faking the developer, which seems extremely easy to do on Chrome Web Store, and you can't easy tell if it's fake just by looking at the developer info, because they point straight to the official websites...
Genuine companies like Avast, Avira, ESET, etc. Always have a proper Privacy Policy for legal reasons. You can also find problems with wordings. They will also have multi-lingual support. If it doesn't look professional exactly like they would normally appear, there is a good indicator it isn't genuine.
Many fake extensions of security software I've found over the past day duration have similar characteristics which scream it is fake. For example, they were put into the Productivity tab which isn't as relevant to what it was being marketed as. It was showing the UI as the screenshots to the actual AV/IS product (Win32 software which cannot be in extension form), discussing detecting and cleaning rootkits (from extension level under a sandbox container since browsers like Chrome do have these? really?), bad upload profile names, etc. No privacy policies. Duplicate/suspicious review comments or negativity from others there.