Crims backdoored the backdoors they supplied to other miscreants. Then the domains lapsed

Source

Here's what $20 gets you these days More than 4,000 unique backdoors are using expired domains and/or abandoned infrastructure, and many of these expose government and academia-owned hosts – thus setting these hosts up for hijacking by criminals who likely have less altruistic intentions than the security researchers who uncovered the very same backdoors.... [...]