From zdnet.com
A new form of ransomware is being distributed through drive-by attacks, but victims can retrieve their locked files for free due to mistakes in the attack’s code.
Shrug ransomware first appeared in the wild on July 6, and comes embedded in fake software and gaming apps. Those who get tricked into downloading and running the file-encrypting malware are met with an extensive and mocking ransom note penned by an attacker calling themselves Martha.
More information here