If we now would run the following command: reg query "HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths" ![]() We have to look at the following registry key: HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths in the properties field. However, we may also receive other 5007, so in order to find the right event ID that indicates an exclusion has been set. This indicates that a Windows Defender AV configuration has been changed. In order to do this, we have to run the following command: Add-MpPreference -ExclusionPath "C:\Windows\Temp"Īt the sample results, we can see an event ID 5007. This allows an adversary to drop all their malicious stuff in a folder without worrying that Windows Defender AV would remove it. The first example will be creating an exclusion to a folder. This includes steps, such as disabling real-time protection and adding exclusions, etc. During this section, we will demonstrate different examples that includes creating exclusions and disabling AV.īesides of that, we will also look at the traces that are left behind on a machine, which can be useful when doing forensics.įirst, we will be simulating the steps that an adversary usually performs, when it comes down to killing Windows Defender AV. This only works, once admin rights have been obtained. Local Admin privileges on a box is required, so to keep it short. In order for an adversary to disable Windows Defender or create any exclusions. We are going to demonstrate a few examples in practice. This happens in most ransomware cases, so in order to have a better understanding. Where the ransomware encryptor started to disable additional protection in Windows Defender. ![]() Source: Īnother example was during the Kaseya ransomware attack. This can be done by simply disabling AV or create exclusions, and so on.ĭuring the Sodinokibi ransomware attack, the threat actors created a GPO and rolled it out across all the systems to disable Windows Defender AV. We have seen in many ransomware attacks that adversaries tend to work their way around Windows Defender AV. This can be done with other solutions as well, so don’t feel the need to only use Azure Sentinel, when you can use other solutions as well. Once we have done that, we will show some examples with Azure Sentinel, which we will be used to create the custom alerts. We will start with showing real cases of adversaries working their way around Windows Defender. In this blog post, we are going to explain why it is relevant to keep an eye on your Windows Defender AV logs, and how to use the data telemetry to create custom alerts. Windows Defender is the traditional out of the box antivirus for a Windows machine. Not to confuse with the EDR solution that’s called ”Defender for Endpoint”. ![]() Today we are going to talk about our good old friend or better known as Windows Defender AV.
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