![]() The following is an example of JS_POWMET. This is difficult to analyze using a sandbox, and 90% of these attacks originate in the Asia-Pacific region. A recent example is called JS_POWMET and shows up via an AutoStart registry procedure by way of infected USB drives. One type of registry change that has seen a resurgence of late are attacks classified as file-less malware. Keep in mind that you will have to perform this process on every registry key that you want to audit. Once you are in advanced permissions enable the following: Set Value, Create Subkey, Create Link, Write DAC and Write Owner. Within the Auditing tab, add the Everyone group as the principle group to audit and select Show Advanced Permissions. The second step is you must run Regedit.exe, manually right-click on each registry key that you want to audit, select permissions, click on the Advanced button, and then select the Auditing tab. Then, enable the Success and Failure options. You can accomplish this by first going into Active Directory or local group policy to enable the Audit Registry option in the Object Access subcategory under Advanced Auditing Policy Configuration at the following location: Computer Configuration > Windows Settings > Security Settings. You will have to first enable registry auditing via Windows Event Logger. This is a built-in service from Microsoft, so this will obviously only apply to Windows users.Įnabling registry auditing is a two-step process. If you haven’t found what you were looking for, try enabling registry auditing. This portion of the investigation should be approached with realistic expectations because you may only find cursory evidence that is of not much help. With that said, the best places to start will be systems containing high-value data, data controllers and other strategic assets such as infrastructure servers. This will have to be performed without much use of your current endpoint antivirus software, as most antivirus solutions do not scan for persistence mechanisms. ![]() Within the registry, you will want to begin with analyzing the registry run keys and scheduled tasks. It is well known that a registry can be large and quite daunting to those who do not work with registries and the entire registry is not the universe that you will be working with, so do not worry. This data will include commands, files referenced, and code. To accomplish this, you will have to recognize common persistence locations and analyze any data that this produces. How do we begin to threat hunt when an embedded piece of malware is not performing any activity? ![]() The best place to start in threat hunting, in this case, is by searching in the registry itself. Threat-Hunting Suspicious Registry Changes Malware sometimes needs to be triggered with a persistence mechanism before it can start leaving a trail of evidence for information security professionals to begin investigating. Commonly used examples of persistence mechanisms include AutoStart locations in the registry, scheduled tasks/cronjobs and boot process redirection. This mechanism is called a persistence mechanism. If the malware on a host is not active, it needs to be triggered to run at a future point in time. ![]() One of the reasons they qualify as IoCs is that cybercriminals need to establish persistence within an infected host on a network via registry changes and system file changes. Suspicious registry and system file changes are used as part of the standard 10 to 15 IoCs that information security professionals use when threat hunting. Suspicious Registry and System File Changes are Indicators of Compromise ![]()
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