Hkey Local Machine Software Policies Microsoft Windows Safer Codeidentifiers Authenticodeenabled

Each of these components determines whether the restriction policies are enabled by reading the registry value HKEYLOCALMACHINE Software Microsoft Policies Windows Safer CodeIdentifiers TransparentEnabled, which if set to 1 indicates that policies are in effect. Dec 21, 2017 registry settings to enable authenticode on win10. GitHub Gist: instantly share code, notes, and snippets.
Symptoms or Error
On 2012 R2 Servers when published application is launched the application instance shows up on the VDA’s task manager but the application UI is not seen on the client side. The issue was not seen on 2016 servers.All 2012 R2 VDA’s were manually created so the issue is not related to a specific image.
Using Process explorer it was identified that Citrix Hooks were not loading.
Looking at working Procmon traces from 2016 VDA and non-working Procmon traces from 2012 R2 VDA we found that in non-working traces there were lot of access denied’s for SystemCertificates for userinit.exe and other citrix binaries like cmstart.exe, wfshell.exe which are crucial for app launch. We did not see this behaviour in working procmon.
On further Procmon analysis, it was found that AuthenticodeEnabled policy was set to 1 (Enabled) on Non-working VDA but was disabled on working VDA.
Non-Working Procmon
2:19:29.7291260 PM winlogon.exe 588 RegQueryValue HKLMSOFTWAREPoliciesMicrosoftWindowssafercodeidentifiersAuthenticodeEnabled SUCCESS Type: REG_DWORD, Length: 4, Data: 1
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Working Procmon
3:04:53.0353112 PM wfshell.exe 4504 RegQueryValue HKLMSOFTWAREPoliciesMicrosoftWindowssafercodeidentifiersAuthenticodeEnabled SUCCESS Type: REG_DWORD, Length: 4, Data: 0
This Authenticode policy translates to System settings: Use certificate rules on Windows executables for Software Restriction GPO.
With this GPO enabled, every executable has to be trusted before it executes. Searching in Salesforce and online, found similar issues with this policy enabled, where Certs failed the CRL check as it happens over OCSP which causes issues with app launch.
The issue is not seen in RDP as it is a Microsoft product and the related executables may be using the set of certificates which could be part of machine certificates. However, ICA needs different set of certificates, for which it required to contact OCSP (Online Certificate Status Protocol) server.
Solution
Disable the GPO under Computer Settings: Use certificate rules on Windows executables for Software RestrictionOther Recommendations
As documented in the below Microsoft article if you enable certificate rules, software restriction policies check a certificate revocation list (CRL) to verify that the software's certificate and signature are valid. This checking process may negatively affect performance when signed programs start. To disable this feature, you can edit the software restriction policies in the appropriate GPO. In the Trusted Publishers Properties dialog box, clear the Publisher and Timestamp check boxes.
https://docs.microsoft.com/en-us/windows/security/threat-protection/security-policy-settings/system-settings-use-certificate-rules-on-windows-executables-for-software-restriction-policies
1. If internet access is enabled on the VDA’s and still the issue is happening then you can edit the software restriction policies in the appropriate GPO. In the Trusted Publishers Properties dialog box, clear the Publisher and Timestamp check boxes.
OR
2. 2. Try following the below steps on the VDA.
Problem Cause
Citrix executables were not being trusted by the OS with System settings: Use certificate rules on Windows executables for Software Restriction enabled. Hence, the Citrix modules were not loaded resulting into Application UI not being visible.
Additional Resources
https://support.citrix.com/article/CTX134804
Disclaimer
Applies To: Windows Server 2016, Windows Server 2012 R2, Windows Server 2012
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This topic for the IT professional gives guidance how to create an allow and deny list for applications to be managed by Software Restriction Policies (SRP) beginning with Windows Server 2008 and Windows Vista.
Introduction
Software Restriction Policies (SRP) is Group Policy-based feature that identifies software programs running on computers in a domain, and controls the ability of those programs to run. You use software restriction policies to create a highly restricted configuration for computers, in which you allow only specifically identified applications to run. These are integrated with Microsoft Active Directory Domain Services and Group Policy but can also be configured on stand-alone computers. For a starting point for SRP, see the Software Restriction Policies.
Beginning with Windows Server 2008 R2 and Windows 7 , Windows AppLocker can be used instead of or in concert with SRP for a portion of your application control strategy.
For information about how to accomplish specific tasks using SRP, see the following:
What default rule to choose: Allow or Deny
Software restriction policies can be deployed in one of two modes that are the basis of your default rule: Allow List or Deny List. You can create a policy that identifies every application that is allowed to run in your environment; the default rule within your policy is Restricted and will block all applications that you do not explicitly allow to run. Or you can create a policy that identifies every application that cannot run; the default rule is Unrestricted and restricts only the applications that you have explicitly listed.
Important
The Deny List mode might be a high-maintenance strategy for your organization regarding application control. Creating and maintaining an evolving list that prohibits all malware and other problematic applications would be time consuming and susceptible to mistakes.
Create an inventory of your applications for the Allow list
To effectively use the Allow default rule, you need to determine exactly which applications are required in your organization. There are tools designed to produce an application inventory, such as the Inventory Collector in the Microsoft Application Compatibility Toolkit. But SRP has an advanced logging feature to help you understand exactly what applications are running in your environment.
To discover which applications to allow
In a test environment, deploy Software Restriction Policy with the default rule set to Unrestricted and remove any additional rules. If you enable SRP without forcing it to restrict any applications, SPR will be able to monitor what applications are being run.
Create the following registry value in order to enable the advanced logging feature and set the path to where the log file should be written.
'HKEY_LOCAL_MACHINESOFTWAREPoliciesMicrosoftWindowsSaferCodeIdentifiers'
String Value: LogFileName path to LogFileName
Because SRP is evaluating all applications when they run, an entry is written to the log file NameLogFile each time that application is run.
Evaluate the log file
Each log entry states:
the caller of the software restriction policy and the process ID (PID) of the calling process
the target being evaluated
the SRP rule that was encountered when that application ran
an identifier for the SRP rule.
An example of the output written to a log file:
explorer.exe (PID = 4728) identifiedC:Windowssystem32onenote.exe as Unrestricted usingpath rule, Guid ={320bd852-aa7c-4674-82c5-9a80321670a3} All applications and associated code that SRP checks and set to block will be noted in the log file, which you then can use to determine which executables should be considered for your Allowed list.
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