[Snort-sigs] db entry for sid 151

pbsarnac at ...427... pbsarnac at ...427...
Sun Mar 10 18:14:11 EST 2002

alert udp $EXTERNAL_NET 60000 -> $HOME_NET 2140 (msg:"BACKDOOR DeepThroat
3.1 Client Sending Data to Server on Network"; reference:arachnids,106;
sid:151; classtype:misc-activity; rev:3;)
This signature indicates that a DeepThroat client has ordered a DeepThroat
trojaned machine on $HOME_NET to do something. DeepThroat sends its control
commands to port 2140 on the trojaned machine.
A remote attacker with DeepThroat access has almost full control of the
trojaned machine, including file manipulation and download, keystoke
logging, password scavenging, and reboot. Additionally, the trojan includes
a port redirector, and IRC bot, and a tool to scan for other DeepThroat
infected machines. There are also prank-type annoyances.
Detailed Information:
DeepThroat is a full-featured remote access trojan.It contains many kiddie
tools, including window enumeration and manipulation; file searching
launching and deletion; remote graphics display sound playing and wallpaper
alteration; remote website launching and file download; shell
alteration(e.g. hiding systray or Start button), CD-ROM open/closing, mouse
button swapping; screen resolution change, display on/off; password
scavenging and screen
capturing. It also includes a remotely activated FTP server, a keystroke
logger, an IRC bot, a port redirector, and a tool to scan for other
DeepThroat servers. Using these tools, an attacker can not only take
of the infected machine, but can use it as a relay to attack others or scan
for more infected machines from within your network.
Attack Scenarios:
Users must be actively enticed into installing the trojan, using any of the
normal social-engineering means. Alternatively, an attacker with physical
access to the machine could simply install it himself.
Ease of Attack:
Very simple. This is a point-and-click tool. The toughest part is
convincing a user to install it, and it could certainly be bound to another
binary for easier social-engineering.
False Positives:

False Negatives:

Corrective Action:
Block UDP port 2140 (standard DeepThroat control port), TCP port 21
(standard DeepThroat FTP server), and TCP port 999 (DeepThroat keyboard
logger). DeepThroat may be set up to run on other ports than those listed
above... removal is the only sure mitigation.
Scan with an anti-virus tool and follow the removal instructions.

Additional References:
Packet dump:
0000  00 50 56 ff ae cb 00 50  56 fe 18 10 08 00 45 00   .PVÿ®Ë.P Vþ....E.
0010  00 1e 30 02 00 00 80 11  b4 71 c0 a8 ea 84 c0 a8   ..0..... ŽqÀšê.Àš
0020  ea 85 ea 60 08 5c 00 0a  85 8e 31 33 02 b0 c0 a8   ê.ê`.\.. ..13.°Àš
0030  ea 84 00 8a 00 bb 00 00  20 46 48 45               ê....»..  FHE

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