polonus
3
It is a javascript downloader trojan 7zip ransomeware launcher, the likes of Kovter and Locky, and often spam related.
Here a story from someone fighting that nasty (do not do this yourself at home): https://community.spiceworks.com/topic/1575845-how-to-run-7zip-in-bat-file-to-recover-files-encrypted-by-cryptolocker
polonus