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06/04-11:23:48297976 192168111:23 -> 192168110:2295 TCP TTL:255 TOS:0x0 ID:58934 DF **S***A* Seq: 0xD3B709A4 Ack: 0xBE09B2B7 Win: 0x2798 TCP Options => NOP NOP TS: 9688775 9682347 NOP WS: 0 MSS: 1460

C:\>net view /domain Domain ------------------------------------------------------------------------------CORLEONE BARZINI_DOMAIN TATAGGLIA_DOMAIN BRAZZI The command completed successfully

Looking at our three TCP/IP attributes, we can find the following: TTL = 255 Window size = 0x2798 Don t fragment bit (DF) = Yes Now, let s review the siphon fingerprint database file osprintsconf:

The next command will list computers in a particular domain:

C:\>net view /domain:corleone Server Name Remark ------------------------------------------------------------------------------\\VITO Make him an offer he can't refuse \\MICHAEL Nothing personal \\SONNY Badda bing badda boom \\FREDO I'm smart \\CONNIE Don't forget the cannoli

[shadow]# grep -i solaris osprintsconf # Window:TTL:DF:Operating System DF = 1 for ON, 0 for OFF 2328:255:1:Solaris 26 - 27 2238:255:1:Solaris 26 - 27 2400:255:1:Solaris 26 - 27 2798:255:1:Solaris 26 - 27 FE88:255:1:Solaris 26 - 27 87C0:255:1:Solaris 26 - 27 FAF0:255:0:Solaris 26 - 27 FFFF:255:1:Solaris 26 - 27

Remember that we can use information from ping sweeps (see 2) to substitute IP addresses for NetBIOS names of individual machines IP address and NetBIOS names are mostly interchangeable (for example, \\1921682025 is equivalent to \\SERVER_NAME) For convenience, attackers will often add the appropriate entries to their %systemroot%\system32\drivers\etc\LMHOSTS file, appended with the #PRE syntax, and then run nbtstat R at a command line to reload the name table cache They are then free to use the NetBIOS name in future attacks, and it will be mapped transparently to the IP address specified in LMHOSTS Dumping the NetBIOS Name Table with nbtstat and nbtscan Another great built-in tool is nbtstat, which calls up the NetBIOS Name Table from a remote system The Name Table contains great information, as seen in the following example:

2:

C:\>nbtstat -A 19216820233 NetBIOS Remote Machine Name Table Name Type Status --------------------------------------------SERVR9 <00> UNIQUE Registered SERVR9 <20> UNIQUE Registered 9DOMAN <00> GROUP Registered 9DOMAN <1E> GROUP Registered SERVR9 <03> UNIQUE Registered INet~Services <1C> GROUP Registered IS~SERVR9<00> UNIQUE Registered 9DOMAN <1D> UNIQUE Registered __MSBROWSE__<01> GROUP Registered ADMINISTRATOR <03> UNIQUE Registered MAC Address = 00-A0-CC-57-8C-8A

We can see the fourth entry has the exact attributes of our Snort trace: a window size of 2798, a TTL of 255, and the DF bit set (equal to 1) Therefore, we should be able to accurately guess the target OS using siphon:

NetBIOS Code <computer name>[00] <domain name>[00] <computer name>[03] <user name>[03] <computer name>[20] <domain name>[1D] <domain name>[1E] <domain name>[1B]

[crush]# siphon -v -i xl0 -o fingerprintout Running on: crush running FreeBSD 40-RELEASE on a(n) i386 Using Device: xl0 Host Port TTL DF Operating System 192168111 23 255 ON Solaris 26 - 27

Resource Workstation Service Domain Name Messenger Service (for messages sent to this computer) Messenger Service (for messages sent to this user) Server Service Master Browser Browser Service Elections Domain Master Browser

As you can see, we were able to guess the target OS, which happens to be Solaris 26, with relative ease It is important to remember that we were able to make an educated guess without sending a single packet to 192168111 all this analysis was done by simply capturing packets on the network Passive fingerprinting can be used by an attacker to map out a potential victim just by surfing to their website and analyzing a network trace or by using a tool such as siphon Although this is an effective technique, it does have some limitations First, applications that build their own packets (for example, nmap) do not use the same signature as the operating system Therefore, your results may not be accurate Second, you must be in a position to capture these packets (which can be difficult on a switch without enabling port mirroring) Third, it is simple for a remote host to change the connection attributes But this latter issue plagues even active detection techniques

Table 3-1

See the prevention countermeasure in Operating System Detection Countermeasures, earlier in the chapter