One year after the release of the technical analysis of the Mumblehard Linux botnet, we are pleased to report that it is no longer active. ESET, in cooperation with the Cyber Police of Ukraine and CyS Centrum LLC, have taken down the Mumblehard botnet, stopping all its spamming activities since February 29th, 2016. ESET is operating a sinkhole server for all known Mumblehard components. We are sharing the sinkhole data with CERT-Bund, which is taking care of notifying the affected parties around the world through their national CERTs. Collaboration with law enforcement and external entities was crucial in making this operation a success. ESET would like to thank the Cyber Police of Ukraine, CyS Centrum LLC and CERT-Bund. We are proud of our efforts to make the internet a safer place. Mumblehard might not be the most prevalent, the most dangerous or the most sophisticated botnet out there, but shutting it down is still a step in the right direction and shows that security researchers working with other entities can help reduce the impact of criminal activity on the internet. ESET has not seen any new variants of Mumblehard, or any activities from this malware group, since the takedown. For more details on the Mumblhard virus, the botnet and its takedown – please read the article on ESET’s blog or this article on theEnquirer.net.