This process works, and as a result, we see that termsrv.dll implements the Legacy Interface of the protocol. We can filter the results by looking for the Interface GUID we identified from the NdrClientCall3 parameters. A brute force strategy is to list all DLL files in system32 and pass them all via the PowerShell pipeline into Get-RpcServer. To find the server, we can use a function from James Forshaw’s NtObjectManager called Get-RpcServer, which parses binary files passed to it to determine if that binary has an RPC server implemented in its code. RPC calls just need a single network view present so you dont need to add. This means that there is likely a binary on the system that implements the RPC Interface and functions as the server, so we need to find it. Network is obsolete: The legacy networking system has been removed in Unity. RPC is a client/server interface where a client, in this case, Legacy_WinStationGetAllProcesses, makes a call to the server, which executes the code associated with the procedure. To continue following the execution path, we must investigate the code associated with the RpcWinStationGetAllProcesses_NT6 RPC Procedure, but because it isn’t an imported function like we saw previously, we have to use a different approach. when suddenly I find all the RPCalls I've written have been deprecated It's not at all sudden if you read release notes or blog, Unity's been vocal about UNet replacing the old system for a while. options and rpcmethods can mark themselves deprecated: true if you plan on. In fact, to this point, nothing has happened in the context of actions taking place to change or enumerate the system. 48 lightning-help Command to return all information about RPC commands. This is EXACTLY what we are concerned about! The first option is to call NtQuerySystemInformation, which we have already covered, but the second method offers a different approach that is worth investigating.Īs you might have guessed, the RPC Procedure call is not the end of the line of execution. is the new set of challenges and requirements posed by NFV (Network Function Virtualization). Some deprecated functions and defines have been removed from the ML. It also removes deprecated // elements from SDF 1.0. from MDSec wrote an excellent blog post exploring 14 alternative options for identifying the process identifier of the LSASS process. Modules in the network view now show small message indicators for warnings, errors. ![]() ![]() Generally speaking, we’ve observed that Native API functions are not the layer that most application developers are expected to interact with, so a reasonable question would be, “are there any higher level functions that might ultimately call NtQuerySystemInformation or similar functions?” One researcher did just this. We then analyzed the function call stack to identify the syscall and the alternative Native API function names. During our analysis of mimikatz, we saw that it called NtQuerySystemInformation to enumerate a list of processes and ultimately find the process identifier (pid) for the LSASS process.
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