Rule:

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Sid:
218

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Summary:
This event is generated when  an attacker attempts to connect to a 
Telnet server using the phrase "friday".

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Impact:
Possible theft of data and control of the targeted machine leading to a
compromise of all resources the machine is connected to.

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Detailed Information:
This Trojan affects Solaris 2.5 operating systems:

Due to the nature of this Trojan it is unlikely that the attacker's 
client IP address has been spoofed.

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Attack Scenarios:
This Trojan may be delivered to the target in a number of ways. This
event is indicative of an existing infection being activated. Initial
compromise may be due to the exploitation of another vulnerability and 
the attacker is leaving another way into the machine for further use.

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Ease of Attack:
This is Trojan activity, the target machine may already be compromised.

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False Positives:
None Known

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False Negatives:
None Known

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Corrective Action:
Disallow Telnet access from external sources.

Use SSH as opposed to Telnet for access from external locations

Delete the Trojan and kill any associated processes.

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Contributors:
Original rule writer unknown
Sourcefire Research Team
Nigel Houghton <nigel.houghton@sourcefire.com>

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Additional References:

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