Defense for Microsoft Active Directory

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1. Turn off LLMNR

More info: https://www.blackhillsinfosec.com/how-to-disable-llmnr-why-you-want-to/

2. Disable NBT-NS

Disabling the use and support of NetBIOS can help to mitigate an attacker's ability to: poison and spoof responses, obtain a user's hashed credentials, inspect web traffic, etc.

3. Turn on SMB Signing on All Devices

Old article, but still works: https://www.itprotoday.com/security/how-do-i-enable-smb-signing

4. Multiple Steps for Ipv6

1. Disable IPv6 via Group Policy and Firewall. If you disable it completely, it can cause issues.

Recommended: Firewall DISABLE.

  1. (Inbound) Core Networking - Dynamic Host Configuraiton Protocol for IPv6 (DHCPV6-IN)
  2. (Inbound) Core Networking - Router Advertisement (ICMPv6-In)
  3. (Outbound) Core Networking - Dynamic Host Configuration Protocol for IPv6 (DHCPV6-Out)

2. If WPAD is not in use internally, disable it via Group Policy and by disabling the WinHttpAutoProxySvc service.

https://docs.microsoft.com/en-us/troubleshoot/windows-server/networking/disable-http-proxy-auth-features

3. Relaying to LDAP and LDAPS can only be mitigated by enabled both LDAP signing and LDAP channel binding.

More research on this needed.

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