Windows 2008 R2 Brute Force Login denemeleri

Merhaba 

Mail sunucumuz (windows w2k8 r2) üzeride bazen brute force yontemi ile login denemeleri yapılıyor. Bunları Event Viewer'dan gözlemleyebiliyorum. Bu login denemelerini engellemek icin asagidaki portları UDP ve TCP olarak firewall üzerinde blokladım. 

135, 137-138-139, ve 445

ayrıca RDP 3389 portu sadece benim lokal IP'ye acık olacak sekilde zaten bir kural firewall üzerinde tanımlı. Sharing ve network discovery windows firewall üzerinde kapalı. 

bunların haricinde bu login denemelerini engellemek icin ne yapabilirim ??? 

Event Log'da gozuken kayit asagidaki gibi .; 

 

 An account failed to log on.

Subject:

Security ID: NULL SID

Account Name: -

Account Domain: -

Logon ID: 0x0

Logon Type: 3

Account For Which Logon Failed:

Security ID: NULL SID

Account Name: administrator

Account Domain: COM4_C03

Failure Information:

Failure Reason: Unknown user name or bad password.

Status: 0xc000006d

Sub Status: 0xc0000064

Process Information:

Caller Process ID: 0x0

Caller Process Name: -

Network Information:

Workstation Name: COM4_C03

Source Network Address: 122.154.157.2

Source Port: 52504

Detailed Authentication Information:

Logon Process: NtLmSsp 

Authentication Package: NTLM

Transited Services: -

Package Name (NTLM only): -

Key Length: 0

This event is generated when a logon request fails. It is generated on the computer where access was attempted.

The Subject fields indicate the account on the local system which requested the logon. This is most commonly a service such as the Server service, or a local process such as Winlogon.exe or Services.exe.

The Logon Type field indicates the kind of logon that was requested. The most common types are 2 (interactive) and 3 (network).

The Process Information fields indicate which account and process on the system requested the logon.

The Network Information fields indicate where a remote logon request originated. Workstation name is not always available and may be left blank in some cases.

The authentication information fields provide detailed information about this specific logon request.

- Transited services indicate which intermediate services have participated in this logon request.

- Package name indicates which sub-protocol was used among the NTLM protocols.

- Key length indicates the length of the generated session key. This will be 0 if no session key was requested.