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You could actually take the time to look up or work out how several of the different HKLM:\SYSTEM keys are related, and figure out a lot more information about each of the removable drives (or any piece of hardware, for that matter)-for example, the first time it was connected, or a better name or description than the previous simple command shows.
Robotstudio license key generator serial#
Here’s what the command looks like on my computer (I removed the serial numbers): While testing different USB devices, it seems that hard drive keys get updated each time they’re plugged in, but non-hard drive devices don’t all seem to have their keys updated. Knowing that it’s not perfect, here’s an example of how getting all of that information:įorEach-Object You can’t tell if it’s when the application was installed or patched, or if the key was manually modified, but knowing the time stamp can still be useful. Looking at the last modified time of each key gives you a pretty reasonable guess as to the last time the application’s installation was modified. Some of these keys contain an InstallDate value, but not all of them. HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall
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It just so happens that you can get a pretty accurate list of installed software by querying the child keys under: Knowing the name and version of an application, and also the last time the installation was modified could be very helpful. Take a list of installed software, for example. The registry obviously contains a ton of information that is useful for auditing. If you don’t want to use the proxy, you need to add a call to the Add-RegKeyMember function (from Reusing PowerShell Registry Time Stamp Code) in the pipeline. Note You have to use the Get-ChildItem proxy function that was discussed yesterday to use the LastWriteTime property. Where-Object LastWriteTime -gt (Get-Date).AddDays(-1) |Īnd, you would get output that looks like this: You could run a command like this:ĭir HKCU:\SOFTWARE\Microsoft\Office -Recurse | You’ve narrowed it down to something under HKCU:\SOFTWARE\Microsoft\Office. Let’s say, for example, that something weird started going on with Office a few hours ago. Again, you can’t pinpoint values that were changed, so searching the registry can be even more of a long shot than the file system, but it can still be useful. That same scenario can play out with registry keys. It’s usually a long shot, but I occasionally get lucky and find a specific configuration file that I could further research, and ultimately fix the issue. Knowing the last time it worked, I’ll sometimes look for any files inside the program’s installation and application data folders that have been modified since that time. I’ve often found myself troubleshooting an issue with an application that has unexpectedly stopped working. Today I’m going to cover a few simple examples of using the last modified property for troubleshooting, auditing, and forensics. If you understand the limitations, you can still gather some pretty useful information. The registry doesn’t keep track of when a key was created either. You can’t use any of the registry key’s properties to tell what was changed-you only know that there was some sort of a change (you can audit changes to the registry by using object access auditing, but that’s not today’s topic). It could be that a value was changed (or multiple values were changed), that a subkey key was created (or deleted), or that the security descriptor was changed. Like the name suggests, the last modified time is the last time that something about the key was changed.
Today I want to explore a few things that you can do with that information.įirst, let’s go over some of the limitations of looking at the last modified property of a registry key.
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If you’ve been following along, you now have the ability to see the last time that a registry key was modified from within Windows PowerShell. Note To follow today’s examples, you’ll need the Add-RegKeyMember and Get-ChildItem functions from the previous two posts.
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Today we wrap-up a four-part series from Rohn Edwards, co-founder of the Mississippi PowerShell User Group. Microsoft Scripting Guy, Ed Wilson, is here. Summary: Guest blogger, Rohn Edwards, talks about leveraging registry key time stamps via Windows PowerShell.