This report has been prepared using depersonalized data processed by Kaspersky Security Network (KSN). The metrics are based on the number of distinct users of Kaspersky Lab products with the KSN feature enabled who encountered ransomware at least once in a given period. The term ransomware covers mainly two types of malware: so-called Windows blockers (they block the OS or browser with a pop-up window) and encryption ransomware. The term also includes select groups of Trojan-Downloaders, namely those that tend to download encryption ransomware upon infection of a PC. Nowadays, encryption ransomware is widely regarded as synonymous with ransomware, although, according to Kaspersky Lab statistics the number of users that regularly encounters blockers remains high.