Network Provider DLL

What the technique is

Adversaries may register malicious network provider dynamic link libraries (DLLs) to capture cleartext user credentials during the authentication process. Network provider DLLs allow Windows to interface with specific network protocols and can also support add-on credential management functions. During the logon process, Winlogon (the interactive logon module) sends credentials to the local mpnotify.exe process via RPC. The mpnotify.exe process then shares the credentials in cleartext with registered credential managers when notifying that a logon event is happening. Adversaries can configure a malicious network provider DLL to receive credentials from mpnotify.exe. Once installed as a credential manager (via the Registry), a malicious DLL can receive and save credentials each time a user logs onto a Windows workstation or domain via the NPLogonNotify() function. Adversaries may target planting malicious network provider DLLs on systems known to have increased logon activity and/or administrator logon activity, such as servers and domain controllers.

What MITRE says you would watch

• AN1598

  Detects registration of new or modified network provider DLLs via registry changes, anomalous file creation of DLLs in system directories, and suspicious process activity (mpnotify.exe interacting with non-standard DLLs). Multi-event correlation ties registry modification events to subsequent DLL loads during user logon activity.