Worok is using multi-stage malware designed to steal data and compromise high-profile victims, using steganography techniques to hide pieces of the final payload in a plain PNG image file.

The graphic file had hidden code, using steganography, that required other non-malicious code to examine the image file for extraneous data, which was then used as a payload.

The operators of a cryptocurrency-mining botnet are currently using an image of pop singer Taylor Swift to hide malware payloads they send to infected computers -- as part of their normal ...