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CompTIA Security+ · CompTIA
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Telnet transmits credentials in clear text over the network. An attacker can use a packet capture tool (like Wireshark) to intercept Telnet traffic and extract the administrator’s username and password. This explains how malware was installed using legitimate credentials.
Telnet no encryption
B. A packet capture tool was used to steal the password. This is the most likely scenario given that the administrator regularly used Telnet, which transmits data in plain text. An attacker could easily capture the login credentials using a packet sniffing tool, then use those stolen credentials to install the malicious software on the server.