Microsoft has now issued a statement denying previous media reports that the Kelihos botnet is back in operation, although it did say a new malware variant seems to be on the rise.
Giveaway: Win the Logitech G910 Orion Spark mechanical keyboard!
Six Windows 10 features not available to Insiders... yet
All the latest on Windows 10 build 10041
windows 10 technical preview
Microsoft wants to turn Android phones into Windows 10 phones
LG Windows Phone mock-up
How to get Cortana working outside of the US in preview build 10041
The Kelibos botnet, an infected network of PCs that Microsoft said it helped to shut down in September 2011, may be making a comeback due to its unknown creators taking control again.
The newly revealed suspect in the Kelihos botnet case, Andrey Sabelnikov, has denied any involvement in the creation of the botnet despite statements by Microsoft to the contrary.
Microsoft has announced that it has helped to not only shut down the Kelihos botnet but has also named a person, Dominique Alexander Piatti, as an defendant in the case.