[Snort-sigs] netbios rule question

RKejariwal at ...2912... RKejariwal at ...2912...
Wed Dec 1 05:32:15 EST 2004

Hi All
I had a question regarding netbios rules. Lately I have been receiving a 
lot of the alerts as shown below where A.A.A.A and B.B.B.B are all 
internal hosts to my network. In addition B.B.B.B is the IP address of our 
domain controller.  Is this merely false positiive or something i should 
be concerned about. How do I go abt troubleshooting further to see what 
exactly is happenig. Any help will be appreciated


[**] [1:2466:4] NETBIOS SMB-DS IPC$ share unicode access [**]
[Classification: Generic Protocol Command Decode] [Priority: 3] 
11/30-14:05:00.173386 A.A.A.A:1105 -> B.B.B.B:139
TCP TTL:128 TOS:0x0 ID:22636 IpLen:20 DgmLen:128 DF
***AP*** Seq: 0xD1482D9A  Ack: 0x4A54B89D  Win: 0xFFFF  TcpLen: 20

[**] [1:2404:5] NETBIOS SMB-DS Session Setup AndX request unicode username 
overflow attempt [**]
[Classification: Attempted Administrator Privilege Gain] [Priority: 1] 
11/30-14:05:00.163386  A.A.A.A:1105 -> B.B.B.B:445
TCP TTL:128 TOS:0x0 ID:22635 IpLen:20 DgmLen:1440 DF
***AP*** Seq: 0xD1482822  Ack: 0x4A54B769  Win: 0xFAB7  TcpLen: 20
[Xref => 
http://www.eeye.com/html/research/advisories/ad20040226.html][Xref => 

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