File: 100000168.txt

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Rule: 

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Sid: 
100000168

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Summary: 
The password-cracking tool Hydra has been detected in HTTP traffic.

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Impact:
An attacker may be attempting to break into one or more web servers monitored 
by Snort via a brute-force password attack. If successful, the attacker may 
gain unauthorized access to internal networks.

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Detailed Information:
Hydra is a password-cracking tool released by a group of security experts 
called THC, "The Hacker's Choice." Requests sent by this tool to a web server 
contain the User-Agent string "Mozilla/4.0 (Hydra)". Since normal browsers' 
User-Agent strings do not contain the string "(Hydra)", the presence of this 
string indicates that the Hydra tool is likely being used.

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Affected Systems:
Any system running a web server.

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Attack Scenarios:
Attackers will use the Hydra password-cracking tool.

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Ease of Attack:
Simple, as the program is publicly available and is well-documented.

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False Positives:
None known.

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False Negatives:
None known.

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Corrective Action:
Check system logs and Snort alert logs for suspicious activity, particularly 
unusual logons. Ensure that secure passwords are being used throughout your 
network.

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Contributors:
rmkml
Sourcefire Research Team

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Additional References

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