SamSam Ransomware has become a multimillion-dollar black market business for cybercriminals. The cyber gang behind the SamSam ransomware has extorted nearly $6 million from its victims since December 2015. Researchers at Sophos have tracked Bitcoin addresses owned by the attackers mentioned on ransom notes of each SamSam version and found the attackers have received more than $5.9 million from just 233 victims. SamSam does not include any worm-like or virus capabilities to spread by itself; instead, the ransomware relies on the human attacker to spread it.
Source: https://thehackernews.com/2018/07/samsam-ransomware-attacks.html