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Rule:
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Sid:
238
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Summary:
This event is generated when a Tribe Flood Network (TFN) Distributed Denial of Service (DDoS) daemon responds to a client request to spawn a shell.
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Impact:
Attempted DDoS. If the listed source IP is in your network, it may be a TFN daemon. If the listed destination IP is in your network, it may be a TFN client.
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Detailed Information:
The TFN DDoS uses a tiered structure of compromised hosts to coordinate and participate in a distributed denial of service attack. Clients communicate with daemons to inform them to launch attacks. A daemon will respond with a client request to spawn a shell with an ICMP echo reply with an ICMP identification number of 123, an ICMP sequence number of 0 and a string of "shell bound to port" in the payload.
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Affected Systems:
Any TFN compromised host.
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Attack Scenarios:
After a host becomes a TFN daemon, it will respond to client requests.
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Ease of Attack:
Simple. TFN code is freely available.
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False Positives:
None Known.
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False Negatives:
None Known.
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Corrective Action:
Perform proper forensic analysis on the suspected compromised host to discover the means of compromise.
Rebuild a confirmed compromised host.
Use a packet-filtering firewall to block inappropriate traffic to the network to prevent hosts from being compromised.
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Contributors:
Original rule written by Max Vision <vision@whitehats.com>
Sourcefire Research Team
Judy Novak <judy.novak@sourcefire.com>
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Additional References:
CVE:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2000-0138
Arachnids:
http://www.whitehats.com/info/IDS182
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