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At a later point in time, the attackers then install an IIS backdoor to provide highly covert and persistent access to the server. Typically, attackers first exploit a critical vulnerability in the hosted application for initial access before dropping a script web shell as the first stage payload. In most cases, the actual backdoor logic is minimal and cannot be considered malicious without a broader understanding of how legitimate IIS extensions work, which also makes it difficult to determine the source of infection. IIS backdoors are also harder to detect since they mostly reside in the same directories as legitimate modules used by target applications, and they follow the same code structure as clean modules. This leads to a relatively lower detection rate for malicious IIS extensions compared to script web shells.
Malicious IIS extensions are less frequently encountered in attacks against servers, with attackers often only using script web shells as the first stage payload. While prior research has been published on specific incidents and variants, little is generally known about how attackers leverage the IIS platform as a backdoor. Microsoft Purview Data Lifecycle ManagementĪttackers are increasingly leveraging Internet Information Services (IIS) extensions as covert backdoors into servers, which hide deep in target environments and provide a durable persistence mechanism for attackers.Microsoft Purview Information Protection.Information protection Information protection.Microsoft Priva Subject Rights Requests.Microsoft Purview Communication Compliance.Microsoft Purview Insider Risk Management.Risk management & privacy Risk management & privacy.Microsoft Defender External Attack Surface Management.
Microsoft Defender Vulnerability Management.Azure Active Directory part of Microsoft Entra.
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