Kelihos malware targets and infects Windows computers, harvesting login data, installing ransomware and distributing spam. With the information, alleged creator Levashov is accused of gaining access to people's bank accounts and manipulate stocks for his own gain.
Yesterday, an AFP report claimed that Levashov was arrested at Barcelona airport in connection with an investigation into Russia hacking the US elections. The Department of Justice has not confirmed or denied that matter, although it's been reported that his wife spoke to Russia Today to confirm a connection. Computerworld, however, has a source saying that the arrest was not related to the election.
As well as launching civil and criminal cases against Levashov, the FBI has also taken steps to dismantle Kelihos. The bureau has already begun to block domains associated with the botnet, and have now set up dummy servers to neutralize instances of the software out in the wild.
Officials have shared details of the malware with antivirus vendors to ensure that they can wipe the software from your system. If you're worried that you may have been compromised, the DoJ advises you to use Microsoft's free Safety Scanner.