White knights exist on the internet in every form. This includes white knight hackers (for lack of a better term). In particular: a group known as White-Hat Ltd. The group’s objective is infiltrating the dark web for leaked information on upcoming cyber-attacks. Due to this, White-Hat Ltd is extremely secretive.
The only members even photographed in the organization are the managers/administrators. Even then, those that are photographed are quick to hide their identities in fear of exposure.