This invite contains additional properties that cause Outlook to make an SMB [server message block] connection and trigger NTLM authentication to a server on the internet that is under the ...

However, if an attacker gets their hands on an IT staff member's username, they can continuously send local or Active Directory NTLM logon attempts to the SMB server through open-source tools.

Starting with this build (Build 25997), the new SMB NTLM blocking feature first announced in Windows 11 Insider Preview Build 25951 now supports specifying exception lists for NTLM usage.

With Windows 11 24H2 these include firewall rule changes, support for blocking NT Lan Manager (NTLM), running SMB over the QUIC transport protocol rather than TCP, and changes to SMB signing and ...

They added that hackers can use many tools to perform this listening, including the Responder.py tool, which they describe as “the go-to tool for every SMB and NTLM hash attack”. The bug ...