JSWorm as the name might have suggest that perhaps it is a Worm written in JavaScript, is not true. It is a ransomware which encrypts its victims file and ask for BTC to decrypt them back.
JSWorm 4 Ransomware Signatures
Family: Ransom:Win32/JSWorm.A!MTB
MD5: c669320b97f2c124307c3e8ae2e9206d
SHA256: 46761b8b727f3002d1c73fa6c8568ebcf2ec0066666251f66dcda9d4268e03e8
JSWorm 4 Ransomware Download