The second sentence is "However, public attribution of these activities to RIS is supported by technical indicators from the U.S. Intelligence Community, DHS, FBI, the private sector, and other entities." You want details in an unclassified report? Do you have any idea how this stuff works? The CIA, the FBI, the "U.S. Intelligence Community," and the Department of Homeland security is all in agreement on something, and you consider that "weak ass"? What is wrong with you?
Maybe you should spend some time on SIPR before you post here again.