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A security analyst is reviewing the following DNS logs as part of security-monitoring activities: FROM 192.168.1.20 A www.google.com 67.43.45.22 FROM 192.168.1.20 AAAA www.google.com 2006:67:AD:1FAB::102 FROM 192.168.1.43 A www.mail.com 193.56.221.99 FROM 192.168.1.2 A www.company.com 241.23.22.11 FROM 192.168.1.211 A www.uewiryfajfchfaerwfj.co 32.56.32.122 FROM 192.168.1.106 A www.whatsmyip.com 102.45.33.53 FROM 192.168.1.93 ARAA www.nbc.com 2002:10:976::1 FROM 192.168.1.78 A www.comptia.org 122.10.31.87 Which of the following most likely occurred?
Correct Answer: A
This is a technique that is commonly used by malware to evade detection and blocking by security tools. The malware generates random domain names that are used to communicate with the command and control server, which can change its IP address frequently. The domain names are usually long and nonsensical, such as www.uewiryfajfchfaerwfj.co in the log. The malware uses a predefined algorithm or a seed value to generate the same domain names as the server, so that they can find each other on the internet12.