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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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