Rule:
alert icmp $EXTERNAL_NET any -> $HOME_NET any (msg:"ICMP PING Sniffer Pro/NetXRay network scan"; itype:8; content:"|43696e636f204e6574776f726b2c20496e632e|"; depth:32; sid:484; classtype:misc-activity; rev:2;)
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Sid:
484

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Summary:
This event is generated when an ICMP echo request is made from a host running Sniffer Pro/NetXRay software.

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Impact:
Information gathering.  An ICMP echo request can determine if a host is active.

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Detailed Information:
An ICMP echo request is used by the ping command to elicit an ICMP echo reply from a listening live host.  An echo request that originates from a Windows host running Sniffer Pro/NetXRay software contains a unique payload in the message request.

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Affected Systems:
All

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Attack Scenarios:
An attacker may attempt to determine live hosts in a network prior to launching an attack.

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Ease of Attack:
Simple

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False Positives:
An ICMP echo request may be used to legimately troubleshoot networking problems.

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False Negatives:
None known.

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Corrective Action:
Block inbound ICMP echo requests.

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Contributors:
Original rule writer unknown
Sourcefire Research Team
Judy Novak <judy.novak@sourcefire.com>

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Additional References:
