The coin-mining botnet known as DDG has seen a flurry of activity since the beginning of the year, releasing 16 different updates over the course of the past three months. Most notably, its operators have adopted a proprietary peer-to-peer (P2P) mechanism that has turned the DDG into a highly sophisticated, seemingly unstoppable threat. The operators have essentially built a redundant network where each node (a.k.a. peer ) communicates with 200 other nodes. The unique architecture also sports a proxy feature that can be used between peers.
Source: https://threatpost.com/p2p-ddg-botnet-unstoppable/154650/