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Rule:
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Sid:
1917
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Summary:
This event is generated when a scan is detected.
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Impact:
Information gathering.
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Detailed Information:
This event indicates that an attempt has been made to scan a host.
This may be the prelude to an attack. Scanners are used to ascertain which ports a host may be listening on, whether or not the ports are filtered by a firewall and if the host is vulnerable to a particular exploit.
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Affected Systems:
Any host.
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Attack Scenarios:
An attacker may determine if UPnP is enabled on a host and then attempt
to exploit a known vulnerability in the service.
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Ease of Attack:
Simple.
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False Positives:
A scanner may be used in a security audit.
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False Negatives:
None Known.
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Corrective Action:
Determine whether or not the scan was legitimate then look for other events concerning the attacking IP address.
Check the host for signs of compromise.
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Contributors:
Sourcefire Research Team
Brian Caswell <bmc@sourcefire.com>
Nigel Houghton <nigel.houghton@sourcefire.com>
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Additional References:
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