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This context provides data after the first 8 bytes and up to 7 packets of an unknown file we couldn’t otherwise identify.

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Context Capture

xxd is a cli-based hex editor; every byte after the 8th is provided up until 7 bytes is seen. In this example the first 8 bytes are numbered to easily show what wouldn’t be matched. Next are “A’s” followed by “shellcode” in hex. You could block this file by adding ‘\x7368656c6c636f6465\x’ in the “Pattern” field of the custom signature.

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