Some of them targeted Exchange Servers with Outlook on the web (OWA) enabled, because OWA is served using IIS. The attacks containing IIS-native malware continued, with antivirus firm ESET tracking 14 groups that used IIS backdoors and information stealers, many of them deployed as IIS extensions or modules. ![]() This malware, dubbed NodeIISWeb, was built to hijack IIS functionality and was injected into the w3wp.exe process. In July that same year, another APT group dubbed Praying Mantis exploited serialization flaws in ASP.NET applications to deploy fileless malware on IIS servers. The group deployed webshells - remotely accessible backdoor scripts - on the servers, prompting the FBI to obtain a rare warrant that allowed the agency to actually connect to the private servers and remove clean malware. In early 2021, hundreds of Microsoft Exchange Servers were hacked through zero-day vulnerabilities by a Chinese cyberespionage group dubbed Hafnium. Why remove these particular exclusions?Įxchange and Microsoft IIS web servers have been a constant target for attackers in recent years as they exploit vulnerabilities in unpatched deployments to install webshells or malicious extensions/modules They also believe it should be safe to remove them from Exchange Server 2016 and Exchange Server 2013 - whose support ends in April - but they advise admins to keep an eye on the servers and if any issues appear to simply add the exclusions back. The Exchange Server team has validated that removing these exclusions has no performance impact when using Microsoft Defender on Exchange Server 2019 running the latest Exchange Server updates.
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