Rule:

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Sid:
237

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Summary:
This event is generated when a trinoo DDoS master host communicates with a daemon host.

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

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Detailed Information:
The trinoo DDoS uses a tiered structure of compromised hosts to coordinate and participate in a distributed denial of service attack. Masters communicate with daemons to direct them to launch attacks.  A master may communicate with a daemon via UDP destination port 27444 with a string of "l44adsl" in the payload.  This string is the default password for the daemon.

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Affected Systems:
Any trinoo compromised host.

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Attack Scenarios:
A trinoo master will communicate with a daemon to direct it to launch attacks.

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Ease of Attack:
Simple. trinoo 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:

CERT:
http://www.cert.org/incident_notes/IN-99-07.html#trinoo

Arachnids:
http://www.whitehats.com/info/IDS197

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