How is someone spoofing the netbios name of a computer on my network?
We had a user using netsend to send obscene messages to other users on our network; howerver, the message was tagged as coming from a computer that doesn't exist. We then used look@lan to scan the network for that netbios name. We found it attached to a computer that had a manchine name that did not match. After rebooting the computer it went back to the machine name and the netbios name matching. This is in a windows 2003 domain network with wins running on one of the domain controllers. Additionally the comptuer was frozen with faronics' deepfreeze. We found out which computer it came from but I really want to know how they did it.
ASKER
I already knew about programs to spoof the content of the netsend message, I'm actually interested in how it got changed so that look@lan and any netbios queries showed the fake name attached to that computer. It tried the Darron's Messenger and succuessfully sent a message with a spoofed name but it still didn't change my netbios name in look@lan.
You could easily use the windows API to do something similar, even from a Word macro (using VBA), for example (got this from a windows security site, so don't shoot the "messenger" - pun intended):
Private Declare Function NetMessageBufferSend Lib "netapi32" (ByVal servername As String, ByVal msgname As String, _
ByVal fromname As String, ByVal msgbuf As String, ByRef msgbuflen As Long) As Long
Private Sub send()
server = "your computer name" 'isnt actually displayed
victim = "person u send it to" 'could use * to send to all
msg = "hello"
fake = "the fake name u want displayed"
'sends the message
success = NetMessageBufferSend(StrCo
StrConv(msg, vbUnicode), ByVal Len(StrConv(msg, vbUnicode)))
End Sub
HTH
Private Declare Function NetMessageBufferSend Lib "netapi32" (ByVal servername As String, ByVal msgname As String, _
ByVal fromname As String, ByVal msgbuf As String, ByRef msgbuflen As Long) As Long
Private Sub send()
server = "your computer name" 'isnt actually displayed
victim = "person u send it to" 'could use * to send to all
msg = "hello"
fake = "the fake name u want displayed"
'sends the message
success = NetMessageBufferSend(StrCo
StrConv(msg, vbUnicode), ByVal Len(StrConv(msg, vbUnicode)))
End Sub
HTH
ASKER
Still doesn't answer the question of how the actual netbios name attached to the computer was changed, only expains how to spoof a message.
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http://www.computing.net/windowsxp/wwwboard/forum/119791.html