The aggressor script can be found in dist-pipe/artifact.cna after the build is complete.Īttacks -> Packages -> Windows Executable (S) Listener: Choose Your listener In this case we will use the ‘pipe’ technique. Load the artifact kit aggressor script to tell Cobalt Strike to use the newly create template when building a payload. By default, this will compile all kit techniques. This is the same as what was done in the example.īuild the kit using the build.sh script. Modify the file src-main/f by adding hello=original.hello as an export option. Now that we know the primitives from our example, we can easily update kit with the changes needed to convert beacon.dll into a proxy. The kit can be loaded by Cobalt Strike as an aggressor script to update how. This kit provide a way to modify several aspects of the. Licensed users of Cobalt Strike have access to the artifact kit. Let’s extend this to the Cobalt Strike Artifact Kit Proxy attacks allow an attacker to hijack execution flow but keep the original functionality of the application. A proxy DLL is just a DLL that proxies legitimate calls and runs your own payload. There really isn’t much to this attack, but it can be very effective. It executed our payload function and the original function. We called the proxy DLL (hello.dll) using rundll32 as an example target for a DLL loading attack. You should create a thread or use some other non-blocking method. It will run the payload function and if a remote target calls a remote function, it will proxy based on the exports set in f. It does not always need to match, but can help if ordinals are used.) proxy.c (Ordinals are another way a function may be called. Calls made to this function are forwarded to the hello function in original.dll. Let’s break down the export hello=original.hello is creating the “hello” export for proxy.dll. If you are not using the _declspec(dllexport) keyword to export the DLL’s functions, the DLL requires a DEF file. f updated with the hello.dll functionsĪ module-definition or DEF file (*.def) is a text file containing one or more module statements that describe various attributes of a DLL. No matter what you do, you will be generating a DLL that forward functions. This shows the process, but could be very different depending on how you build your DLL. This will give us what we need to build our proxy. The point of this is to get a list of the legitimate exported functions from the target DLL.
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