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Uac report file 9reizdur5/31/2023 User Account Control: Behavior of the elevation prompt for administrators in Admin Approval Modeġ = Prompt for credentials on the secure desktopĢ = Prompt for consent on the secure desktopĥ = Prompt for consent for non-Windows binaries (Default) User Account Control: Admin Approval Mode for the built-in Administrator account User Account Control: Virtualize file and registry write failures to per-user locations User Account Control: Run all administrators in Admin Approval Mode Microsoft\Windows\CurrentVersion\policies\system (Software) Get Select User Account Control (UAC) Values Below is the output from the uac plug-in when UAC is turned on with the default settings (when UAC is off the EnableLUA and ConsentPromptBehaviorAdmin values are both set to zero): The Microsoft article UAC Group Policy Settings and Registry Key Settings outlines the UAC registry settings and the uac RegRipper plugin can extract this information. When faced with an infected system it’s important to check the UAC settings due to the potential impact UAC has on malware. The malware will no longer have the ability to make system wide changes unless it can elevate its privileges. In most cases, these areas are the user’s profile and any mapped drives. The impact on malware is pretty significant it is restricted to the locations on the system where the user account has permissions. What UAC does is to restrict the elevated privileges from applying to every application launched by the user. If malware executed on a system with elevated privileges then it could make changes system wide. The issue with doing everyday tasks with administrative privileges is that any application executed by the user also runs with elevated privileges. It even reached a point to where certain applications don’t function properly without these elevated rights. Over the years people have grown accustomed to using user accounts with local administrator privileges on their Windows systems. This is a pretty significant feature as it relates to malware. “ The primary goal of User Account Control is to reduce the exposure and attack surface of the Windows 7 operating system by requiring that all users run in standard user mode, and by limiting administrator-level access to authorized processes.” By default, UAC is turned on in both operating systems. The following are the sections for this post:Īs I mentioned previously, UAC was first introduced with Windows Vista and the feature carried over to Windows 7. In this post I’m having a little fun by demonstrating the impact UAC has on malware and how effective the DLL search order exploit is for bypassing UAC. How ZeroAccess will leverage the DLL search order vulnerability to bypass the restrictions enforced by UAC. It reminded me about something I read about the ZeroAcess Rootkit. Recently, I’ve been doing work involving client-side exploits when I was reading a recipe about using Metasploit to take advantage of the way some applications loads external libraries on the Windows operating system. UAC not only has an impact on the tools we use as I discussed before but it has the same impact on tools used by others such as malware. Then you simply bake that into whatever process you like.The User Account Control (UAC) is a feature in Windows where every application ran under an administrator user account only runs in the context of a standard user. Once that's done, you can audit those events in a PowerShell script by looking for the Windows Event of the appropriate ID like this: $UACEvents = Get-WinEvent -LogName System | where Id -in (4648, 4624) Using all these events, you can get a clear picture of the timeline for every process that requested an elevated rights with UAC dialog. Event Id created by this: 4688.Īlso, look at event id 4696 to see when a new token (user-logon handle) was assigned to process. The Event IDs created by this: 46.Īudit Process Tracking will give you information about processes and their creation/termination. The policy in interest is found at: Computer Configuration\Policies\Windows Settings\Security Settings\Local Policies\Audit PolicyĪudit Privilege Use will give you information about elevated usage using the UAC consent.exe dialog box in the System Event log. Uac Auditing is done by changing windows policy (Local\Group). To see when UAC Prompts are displayed, you can enable UAC Auditing on devices with a regkey or a Group Policy setting, as covered here:
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