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Evolution of JSWorm ransomware

SecureList

Several versions were released as part of each “rebranded” variant that altered different aspects of the code, renamed file extensions, cryptographic schemes and encryption keys. The files are encrypted using a custom modification of a Blowfish cipher with a 256-bit key. The encrypted data is written over the original.

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Ransomware by the numbers: Reassessing the threat’s global impact

SecureList

In addition, attackers appear to be more focused on exfiltrating data as well as encrypting it, i.e., siphoning off confidential information and threatening to make it public if the victims refuse to pay. These include crypto-ransomware (malware that encrypts your files), screen lockers, browser lockers, and boot lockers.