Frebniis abuses Microsoft IIS to smuggle malicious commands in web traffic.
By Dan Goodin
Researchers have discovered a clever piece of malware that stealthily exfiltrates data and executes malicious code from Windows systems by
abusing a feature in Microsoft Internet Information Services (IIS).
IIS is a general-purpose web server that runs on Windows devices. As a
web server, it accepts requests from remote clients and returns the
appropriate response. In July 2021, network intelligence company
Netcraft said there were 51.6 million instances of IIS spread across
13.5 million unique domains.
https://arstechnica.com/?p=1918304
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