Tuesday, May 17, 2022

IISpy: A complex server‑side backdoor with anti‑forensic features

The second in our series on IIS threats dissects a malicious IIS extension that employs nifty tricks in an attempt to secure long-term espionage on the compromised servers

ESET researchers have discovered and analyzed a previously undocumented backdoor, implemented as an extension for Internet Information Services (IIS), Microsoft’s web server software. The backdoor, which we named IISpy, uses a variety of tricks to interfere with the server’s logging and to evade detection, in order to perform…

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