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Study the snort rule given below and interpret the rule. alert tcp any any --> 192.168.1.0/24111 (content:"|00 01 86 a5|"; msG. "mountd access";)A. An alert is generated when a TCP packet is generated from any IP on the 192.168.1.0 subnet anddestined to any IP on port 111B. An alert is generated when any packet other than a TCP packet is seen on the network anddestined for the 192.168.1.0 subnetC. An alert is generated when a TCP packet is originated from port 111 of any IP address to the192.168.1.0 subnetD. An alert is generated when a TCP packet originating from any IP address is seen on the networkand destined for any IP address on the 192.168.1.0 subnet on port 111

Question

Study the snort rule given below and interpret the rule. alert tcp any any --> 192.168.1.0/24111 (content:"|00 01 86 a5|"; msG. "mountd access";)A. An alert is generated when a TCP packet is generated from any IP on the 192.168.1.0 subnet anddestined to any IP on port 111B. An alert is generated when any packet other than a TCP packet is seen on the network anddestined for the 192.168.1.0 subnetC. An alert is generated when a TCP packet is originated from port 111 of any IP address to the192.168.1.0 subnetD. An alert is generated when a TCP packet originating from any IP address is seen on the networkand destined for any IP address on the 192.168.1.0 subnet on port 111

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Solution

The correct interpretation of the given Snort rule is D. An alert is generated when a TCP packet originating from any IP address is seen on the network and destined for any IP address on the 192.168.1.0 subnet on port 111.

Here's the step-by-step interpretation:

  1. "alert tcp any any --> 192.168.1.0/24 111": This part of the rule is specifying the conditions for when the alert should be triggered. It's saying that the alert should be triggered for TCP packets ("alert tcp") originating from any IP address ("any any") that are destined for any IP address on the 192.168.1.0 subnet ("192.168.1.0/24") on port 111 ("111").

  2. "(content:"|00 01 86 a5|";": This part of the rule is specifying that the content of the packet must contain the hexadecimal values 00 01 86 a5 for the alert to be triggered.

  3. "msG. "mountd access";)": This part of the rule is specifying the message that should be displayed when the alert is triggered. In this case, the message is "mountd access".

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