Recently on our network our Security Event Logs have been documenting unusual login attempts on our network. For example, the most recent logon attempt was last evening with the login credentials:
User Name: MAIL$
Logon Type: 3
Logon Process: NtLmSsp
Authentication Package: NTLM
Workstation Name: MAIL
There are several issues with this logon information. First, we do not have a domain entitled VIVALIGHTING, or a username of MAIL$. Secondly, we have no workstation titled MAIL.
In the past we've had bogus usernames such as SUPERPUMPER2000$ attempting to login as well!
This is all the information the event report is giving us. My initial thought was someone attempting to come inbound on a Wireless Network. But, we have no wireless network so this is not possible. Is there any type of software that could be tripping this? It seems to me that this is a malicious attempt. We are well secured so I'm wondering if a workstation downloaded & executed some type of software.