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Call to DllMain when unloading reflective DLL 

Prior to this fix, DllMain with the ProessDetach flag was not called
when unloading the reflectively loaded DLL. This was causing very weird
crashes in the Invoke-NinjaCopy script which is built on this script.
This should fix the crash.
This commit is contained in:
clymb3r 2013-09-03 20:10:18 -07:00
parent 6807da424f
commit 5e1f6ac29a
1 changed files with 9 additions and 0 deletions
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9
CodeExecution/Invoke-ReflectivePEInjection.ps1
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@ -2620,6 +2620,15 @@ Blog on modifying mimikatz for reflective loading: http://clymb3r.wordpress.com/
$ImportDescriptorPtr = Add-SignedIntAsUnsigned ($ImportDescriptorPtr) ([System.Runtime.InteropServices.Marshal]::SizeOf($Win32Types.IMAGE_IMPORT_DESCRIPTOR)) $ImportDescriptorPtr = Add-SignedIntAsUnsigned ($ImportDescriptorPtr) ([System.Runtime.InteropServices.Marshal]::SizeOf($Win32Types.IMAGE_IMPORT_DESCRIPTOR))
} }
} }
#Call DllMain with process detach
Write-Verbose "Calling dllmain so the DLL knows it is being unloaded"
$DllMainPtr = Add-SignedIntAsUnsigned ($PEInfo.PEHandle) ($PEInfo.IMAGE_NT_HEADERS.OptionalHeader.AddressOfEntryPoint)
$DllMainDelegate = Get-DelegateType @([IntPtr], [UInt32], [IntPtr]) ([Bool])
$DllMain = [System.Runtime.InteropServices.Marshal]::GetDelegateForFunctionPointer($DllMainPtr, $DllMainDelegate)
$DllMain.Invoke($PEInfo.PEHandle, 0, [IntPtr]::Zero) | Out-Null
$Success = $Win32Functions.VirtualFree.Invoke($PEHandle, [UInt64]0, $Win32Constants.MEM_RELEASE) $Success = $Win32Functions.VirtualFree.Invoke($PEHandle, [UInt64]0, $Win32Constants.MEM_RELEASE)
if ($Success -eq $false) if ($Success -eq $false)