What is Packet Analysis ?

The acquisition and interpretation of network traffic is known as packet analysis.

This involves capturing and documenting traffic in real time. This also entails evaluating recorded data and deciphering its significance. For instance, in order to create a narrative about who was infected,

how they were infected, what they were infected with, and who attacked them, a corporation with a hacked system would conduct a packet analysis.

Packet Analysis can be crucial in identifying multiple stages of the Kill Chain. - By identifying these stages, it becomes easier to defend against an attacker at different stages of the Kill Chain.

Control information and user data, usually referred to as the payload, make up a packet. Data for delivering the payload, including as source and destination network addresses, error

detection codes, and sequencing information, are provided by control information. Consider it similar to a text or email. Sender, Receiver, and Contents are included.

DNS - Uses UDP instead of TCP to transport. - Translates more readily memorized domain names to the numerical IP. - For example: When you go to the website google.com, it navigates to the IP address 172.217.164.174.

TCP - Threeway Handshake: Used by TCP in order to establish a connection between the Host and Destination. Consists of 3 TCP

Flags: - SYN - ACK - SYN & ACK - Transport level of OSI

The Packet Analysis plugin architecture handles parsing of packet headers at layers below Zeek's existing Session analysis.

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