Malware
Kovter
Kovter is a Police Ransomware Feb 2012 - Police Ransomware Aug 2013 - Became AD Fraud Mar 2014 - Ransomware to AD Fraud malware June 2014 - Distributed from sweet orange exploit kit Dec 2014 - Run aff
Kovter is a Windows malware family.
Background
Kovter began life as police ransomware and evolved considerably over the years:
Feb 2012 - Police Ransomware Aug 2013 - Became AD Fraud Mar 2014 - Ransomware to AD Fraud malware June 2014 - Distributed from sweet orange exploit kit Dec 2014 - Run affiliated node Apr 2015 - Spread via fiesta and nuclear pack May 2015 - Kovter become fileless 2016 - Malvertising campaign on Chrome and Firefox June 2016 - Change in persistence July 2017 - Nemucod and Kovter was packed together Jan 2018 - Cyclance report on Persistence
Source: Malpedia (Fraunhofer FKIE).