PublicKey in Stratum JSON Packet

[OneElevenS]

I've been reading this article (http://www.secureworks.com/resources/blog/hacker-hijacks-synology-nas-boxes-for-dogecoin-mining-operation-reaping-half-million-dollars-in-two-months/).

The author claims that the public key of the 'bot-master' is visible in the JSON Packet. I can't find it anywhere in that packet. Am I missing something here? Any help would be greatly appreciated.