251.txt

snort入侵检测规则文件2.4 Snort是众所周知的网络入侵检测工具

Rule:
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Sid:
238

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Summary:
This event is generated when a command is sent to a Tribal Flood Network
(TFN) Distributed Denial of Service (DDoS) daemon.

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Impact:
Attempted DDoS.  If the listed source IP is in your network, it may be a
TFN client.  If the listed destination IP is in your network, it may be 
a TFN daemon.

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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.

This event is indicative of a client sending commands to a daemon.

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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 <[e-mail]>
Sourcefire Research Team
Nigel Houghton <[e-mail]>
Judy Novak <[e-mail]>

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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/IDS183

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