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The following analytic detects the behavior of dumping credentials from memory, a tactic commonly used by adversaries to exploit the Local Security Authority Subsystem Service (LSASS) in Windows, which manages system-level authentication. The detection is made by monitoring logs with process information from endpoints and identifying instances where the rundll32 process is used in conjunction with the comsvcs.dll and MiniDump. This indicates potential LSASS dumping attempts used by threat actors to obtain valuable credentials. The detection is important because credential theft can lead to broader system compromise, persistence, lateral movement, and escalated privileges. No legitimate use of this technique has been identified yet. This behavior is often part of more extensive attack campaigns and is associated with numerous threat groups that use the stolen credentials to access sensitive information or systems, leading to data theft, ransomware attacks, or other damaging outcomes. False positives can occur since legitimate uses of the LSASS process can cause benign activities to be flagged. Next steps include reviewing the processes involved in the LSASS dumping attempt after triage and inspecting any relevant on-disk artifacts and concurrent processes to identify the attack source.

The following table contains possible examples of comsvcs.dll being misused. While comsvcs.dll is not inherently malicious, its legitimate functionality can be abused for malicious purposes.

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As we discussed in the analysis section above and in our analysis of Rundll32, adversaries can create a MiniDump file containing credentials by using rundll32.exe to execute the MiniDumpW function in comsvcs.dll and feeding it the LSASS process ID. To detect this behavior, you can monitor for the execution of a process that seems to be rundll32.exe along with a command line containing the term MiniDump.

Errors related to comsvcs.dll can arise for a few different different reasons. For instance, a faulty application, comsvcs.dll has been deleted or misplaced, corrupted by malicious software present on your PC or a damaged Windows registry.

In the vast majority of cases, the solution is to properly reinstall comsvcs.dll on your PC, to the Windows system folder. Alternatively, some programs, notably PC games, require that the DLL file is placed in the game/application installation folder.

Reconstructing the session, we can see the remote scheduled task that was created and analyse what it is doing. From the below screenshot, we can see the task created will use CMD to launch a command to locate LSASS, and subsequently dump it to \Windows\Temp\tmp.dmp using the MiniDump function within the comsvcs.dll:

After seeing this command, it would be a good idea to look at all activity targeted toward LSASS for this endpoint. To do that, I can use the query filename.dst = 'lsass.exe' and start to investigate by opening up meta keys like the ones below. Something that stands out as interesting is the usage of rundll32.exe to load a function called minidump from the comsvcs.dll:

Pivoting into the Events view, we can see the full command a lot easier. Here we can see that rundll32.exe is loading the MiniDump function from comsvcs.dll and passing some parameters, such as the process ID for dumping (which was found by the initial process enumeration), location and name for the dump, and the keyword full:

comsvcs.dll is a DLL file used by COM+ Services created by Microsoft Corporation This process is still being reviewed.

Non-system processes like comsvcs.dll originate from software you installed on your system. Since most applications store data on your hard disk and in your system's registry, it is likely that your computer has suffered fragmentation and accumulated invalid entries which can affect your PC's performance.

In Windows Task Manager, you can see what CPU, memory, disk and network utilization is causing the COM+ Services process. To access the Task Manager, hold down the Ctrl + Shift + Esc keys at the same time. These three buttons are located on the far left of your keyboard.

The comsvcs.dll is an executable file on your computer's hard drive. This file contains machine code. If you start the software COM+ Services on your PC, the commands contained in comsvcs.dll will be executed on your PC. For this purpose, the file is loaded into the main memory (RAM) and runs there as a COM+ Services process (also called a task).

Many non-system processes that are running can be stopped because they are not involved in running your operating system.comsvcs.dll is used by 'COM+ Services'. This is an application created by 'Microsoft Corporation'.

If you no longer use COM+ Services, you can permanently remove this software and thus comsvcs.dll from your PC. To do this, press the Windows key + R at the same time and then type 'appwiz.cpl'. Then find COM+ Services in the list of installed programs and uninstall this application.

Most comsvcs issues are caused by the application executing the process. The surest way to fix these errors is to update or uninstall this application. Therefore, please search the Microsoft Corporation website for the latest COM+ Services update.

Erros relacionados ao comsvcs.dll podem surgir por diferentes razes diferentes. Por exemplo, um aplicativo defeituoso, o comsvcs.dll ter sido excludo ou perdido, corrompido por software malicioso presente no seu PC ou um registro danificado do Windows. ff782bc1db