File: 222.txt

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Rule:

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Sid:
222

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Summary:
This event is generated when ICMP traffic is sent between Tribe Flood Network 2000 (TFN2K) hosts.

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Impact:
Attempted DDoS. It is possible there is a TFN2K host in your network. 

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Detailed Information:
When TFN2K hosts communicate using ICMP, they may use an ICMP echo reply with an ICMP identification number of 0 and with a sequence of A's in the payload.  The tell-tale sequence of A's is a problem with the Base 64 encoding that was employed.   

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Affected Systems:
Any TFN2K infected host. 

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Attack Scenarios:
TFN2K hosts communicate with each other for various reasons for the ultimate purpose of attacking a target.

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Ease of Attack:
Simple. TFN2K 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:

Arachnids:
http://www.whitehats.com/info/IDS425

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