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Similarly, other protected process levels have different code policies enforced by Windows.
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After the anti-malware services have opted into the protected service mode, only Windows signed code or code signed with the anti-malware vendor’s certificates are allowed to load in that process. Each system protected process has an associated level or attribute, which indicates the signature policy of the signed code allowed to load within the process. The new security model uses a slightly different variant of the protection process infrastructure called system protected process, which is more suitable for this feature as this keeps the DRM content separate. See Protected Processes in Windows Vista for more information on protected processes. The following scripting DLLs are forbidden by CodeIntegrity inside a protected process (whether loaded directly or indirectly) such as via WinVerifyTrust or WinVerifyTrustEx for checking script signatures via AuthentiCode: scrobj.dll, scrrun.dll, jscript.dll, jscript9.dll, and vbscript.dll. The protected process infrastructure only allows trusted, signed code to load and has built-in defense against code injection attacks. This new security model extends the protected process infrastructure previous versions of Windows used for specific scenarios, such as playing DRM content, into a general-purpose model that can be used by 3rd party anti-malware vendors. Starting with Windows 8.1, a new security model has been put in place in the kernel to better defend against malicious attacks on system-critical components.
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This document describes how an anti-malware vendor with an Early Launch Anti-Malware (ELAM) driver can opt-in to this feature and launch their anti-malware service as a protected service. Windows also protects these processes from code injection and other attacks from admin processes. After the service is launched as protected, Windows uses code integrity to only allow trusted code to load into the protected service. In Windows 8.1, a new concept of protected service has been introduced to allow anti-malware user-mode services to be launched as a protected service.
However, such techniques are not completely foolproof and tend to be error prone because they have to identify functionality that Windows performs on their service and selectively enable that functionality. To defend against attacks on the user-mode service, anti-malware vendors have to add a lot of functionality and heuristics to their software. This user-mode service becomes a frequent target of malware because it’s the single point of failure to disable protection on a system. This user-mode service is also frequently responsible for downloading the latest virus definitions and signatures. Most anti-malware solutions include a user-mode service that performs specialized operations to detect and remove malware from the system. References and resources discussed here are listed at the end of this topic.
This information applies to the following operating systems and their successors: Learn about protecting anti-malware (AM) user mode services and how you can opt to include this feature in your anti-malware service. Windows 8.1 introduced a new concept of protected services to protect anti-malware services, which are a frequent target of attack by malware.
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