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Which of these is malicious code designed to conceal the presence of other malware?
Rootkit
Trojan
Backdoor
Worm
Rootkits conceal other processes by intercepting kernel calls, enabling them to hide from antivirus and other software. EDIT: Trojan also do conceal malware. As a matter of fact, Trojan is more known for concealment than Rootkit which known more for gaining root/admin access to a system. I believe the answer should be "Trojan."
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