SigmaHQ Detections
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Adversaries may leverage the COR_PROFILER environment variable to hijack the execution flow of programs that load the .NET CLR.
The COR_PROFILER is a .NET Framework feature which allows developers to specify an unmanaged (or external of .NET) profiling DLL to be loaded into each .NET process that loads the Common Language Runtime (CLR).
These profiliers are designed to monitor, troubleshoot, and debug managed code executed by the .NET CLR.
(Citation: Microsoft Profiling Mar 2017)
(Citation: Microsoft COR_PROFILER Feb 2013)
The COR_PROFILER is a .NET Framework feature which allows developers to specify an unmanaged (or external of .NET) profiling DLL to be loaded into each .NET process that loads the Common Language Runtime (CLR).
These profiliers are designed to monitor, troubleshoot, and debug managed code executed by the .NET CLR.
(Citation: Microsoft Profiling Mar 2017)
(Citation: Microsoft COR_PROFILER Feb 2013)
Detects the creation of a dMSA service account using the New-ADServiceAccount cmdlet in certain OUs.
The fact that the cmdlet is used to create a dMSASvc account in a specific OU is highly suspicious.
It is a pattern trying to exploit the BadSuccessor privilege escalation vulnerability in Windows Server 2025.
On top of that, if the user that is creating the dMSASvc account is not a legitimate administrator or does not have the necessary permissions,
it is a strong signal of an attempted or successful abuse of the BaDSuccessor vulnerability for privilege escalation within the Windows Server 2025 Active Directory environment.
The fact that the cmdlet is used to create a dMSASvc account in a specific OU is highly suspicious.
It is a pattern trying to exploit the BadSuccessor privilege escalation vulnerability in Windows Server 2025.
On top of that, if the user that is creating the dMSASvc account is not a legitimate administrator or does not have the necessary permissions,
it is a strong signal of an attempted or successful abuse of the BaDSuccessor vulnerability for privilege escalation within the Windows Server 2025 Active Directory environment.
Detects Obfuscated Powershell via RUNDLL LAUNCHER
Detects usage of the "Set-Service" powershell cmdlet to configure a new SecurityDescriptor that allows a service to be hidden from other utilities such as "sc.exe", "Get-Service"...etc. (Works only in powershell 7)
Detects SyncAppvPublishingServer process execution which usually utilized by adversaries to bypass PowerShell execution restrictions.
Detects modifications to the Windows Defender configuration settings using PowerShell to add exclusions
Detects various indicators of Microsoft Connection Manager Profile Installer execution
Detects usage of bitsadmin downloading a file
Detects usage of bitsadmin downloading a file with a suspicious extension
Detects usage of bitsadmin downloading a file to a suspicious target folder
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