Network Provider DLL

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.(Citation: Network Provider API) 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.(Citation: NPPSPY - Huntress)(Citation: NPPSPY Video)(Citation: NPLogonNotify) Adversaries can configure a malicious network provider DLL to receive credentials from `mpnotify.exe`.(Citation: NPPSPY) 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.(Citation: NPLogonNotify) 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.(Citation: NPPSPY - Huntress)

Linked Issues

Issuelinks
Linktype	Issue
is related to	Techniques
is blocked by	Restrict Registry Permissions
is blocked by	Audit
is blocked by	Operating System Configuration
is blocked by	Detect Network Provider DLL Registration and Credential Capture
is blocked by	Configuration Change Control
is blocked by	Access Restriction For Change
is blocked by	Secure Baseline Configurations
is blocked by	Least Functionality
is blocked by	Continuous Monitoring
is blocked by	Endpoint File Integrity Monitoring (FIM)
is blocked by	Access Enforcement
is blocked by	Least Privilege

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