ZLoader, last seen in early 2018, has been spotted in more than 100 email campaigns since the beginning of the year. It is variant of the infamous Zeus used by a major theft ring to steal tens of millions of dollars before they were caught in 2010. Zloader is under active development with 25 versions seen in the wild since its comeback in December 2019, the latest one observed this month. It uses web injects to steal credentials and private banking information from victims along with sensitive data stored in browsers.
Source: https://www.bleepingcomputer.com/news/security/zloader-banking-malware-is-back-deployed-in-over-100-campaigns/