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Trojan malware can be generalized into one of several basic categories. What does an FTP trojan do?
They're used to put antivirus and firewall out of operation
They're used to gain remote access to a target system
They're used to create a file transfer server to copy files onto a target system
They're used to acquire data from a target system and to send it to the attacker
File Transfer Protocol trojans create FTP servers to copy files onto a target system. TCP/IP ports 20 and 21 are usually used for FTP. EDIT: Doesn't "They're used to acquire data from a target system and to send it to the attacker" fall under "They're used to create a file transfer server to copy files onto a target system"? Or is this one of those, choose-the-best-answer questions? FTP stands for File Transfer Protocol. "File transfer" in one of the listed answers should catch your attention. I strongly agree, the main reason for file transfer is to acquire data from a target system. EDIT: I took the liberty to change the answer to "used to acquire data from a target system and send it to the attacker" since the attacker uses the trojan to connect to port 21 on the *target machine but then uses the FTP capability to transfer files from the target to the attackers machine (or other destination). The idea here is the exfiltration of data away from the target using FTP
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