‘Frebniis’ Malware Hijacks Microsoft IIS Function to Deploy Backdoor
A recently identified malware family is abusing Microsoft Internet Information Services (IIS) to deploy a backdoor and monitor all HTTP traffic to the infected system, Symantec reports. Dubbed Frebniis, the malware injects code into a DLL that an IIS feature called Failed Request Event Buffering (FREB) uses when troubleshooting failed requests. FREB collects data about the tracked requests, including HTTP headers with cookies, originating IP address and port, and more. As part of the observed…
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