Reach out to dedicated cybersecurity and law enforcement agencies in the Philippines:

Witnesses describe the "Boso Ninja" as wearing all black—a bonnet , a face mask (for health protocols, presumably), and tsinelas na itim. He does not speak. He does not steal. He simply... observes. And reportedly, he carries a small notepad, jotting down times.

It does not appear to be an existing, well-known title. The phrase combines common words and concepts but is not linked to a specific piece of mainstream media.