Get all threads of a process using win32api (Python)

Question

Let's say I have the following code that gets a handle to a process:

pid = 1234
procHandle = win32api.OpenProcess(win32con.MAXIMUM_ALLOWED,pywintypes.FALSE,pid)

How would I list and get handles on it's threads?

Answer 1

as far i know not exist public api which enumerated threads in process. but exist NtQuerySystemInformation and SystemProcessInformation or SystemExtendedProcessInformation - it return list of all processes and threads in system. by using this you can found all threads in process by id, not need open process

NTSTATUS DumpProcessThreads(_Out_ ULONG_PTR dwProcessId)
{
    NTSTATUS status;
    ULONG cb = 0x10000;
    do 
    {
        status = STATUS_NO_MEMORY;

        if (PVOID buf = LocalAlloc(0, cb + 0x1000))
        {
            if (0 <= (status = NtQuerySystemInformation(SystemExtendedProcessInformation, buf, cb, &cb)))
            {
                status = STATUS_INVALID_CID;

                union {
                    PVOID pv;
                    PBYTE pb;
                    PSYSTEM_PROCESS_INFORMATION pspi;
                };

                pv = buf;
                ULONG NextEntryOffset = 0;

                do 
                {
                    pb += NextEntryOffset;

                    if (pspi->UniqueProcessId == (HANDLE)dwProcessId)
                    {
                        status = STATUS_SUCCESS;

                        if (ULONG NumberOfThreads = pspi->NumberOfThreads)
                        {
                            PSYSTEM_EXTENDED_THREAD_INFORMATION TH = pspi->TH;

                            do 
                            {
                                DbgPrint("%p: %p(%p) [%p]\n", 
                                    TH->ClientId.UniqueThread, 
                                    TH->StartAddress, 
                                    TH->Win32StartAddress, 
                                    TH->TebAddress);

                            } while (TH++, --NumberOfThreads);
                        }
                        break;
                    }

                } while (NextEntryOffset = pspi->NextEntryOffset);
            }

            LocalFree(buf);
        }

    } while (status == STATUS_INFO_LENGTH_MISMATCH);

    return status;
}