[Snort-sigs] SID: 366 (my contribution #2)
alexander.s at ...1565...
Mon Jun 9 09:38:09 EDT 2003
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alert icmp $EXTERNAL_NET any -> $HOME_NET any (msg:"ICMP PING *NIX";
ping is a standard networking utility that determines if a target host
is up. This rule indicates that the ping originated from a host running
Can be used as a reconnaissance tool.
ping sends an ICMP Echo Request packet to an IP address. If a host is
up at that address it will reply with an ICMP Echo Reply. The reply
includes the data portion of the echo packet. The data included in the
Echo Request varies across different implementations.
An attacker will often ping a machine to make sure it is up before
Ease of Attack:
This program is also used legitimately by users and/or network
administrators to troubleshoot problems. It is possible to emulate this
ping signature using another ping utility.
ICMP packets can be blocked with a firewall.
Documentation - Steven Alexander<alexander.s at ...1565...>
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