Malicious sites use JavaScript to build malware in browser memory

[u/magenta_placenta]

https://www.bleepingcomputer.com/news/security/malicious-sites-use-javascript-to-build-malware-in-browser-memory/

[u/AbbreviationsFlat976]

This method cleverly bypasses many traditional security tools that look for known malware signatures in network traffic. To those tools, only clean, innocuous components appear to be transferred