Jared has discovered malware on the workstations of several users. This particular malware provides administrative privileges for the workstation to an external hacker. What best describes this malware?

Rootkits provide administrative access to systems, thus the "root" in rootkit. A Trojan horse combines malware with a legitimate program. A logic bomb performs its malicious activity when some condition is met. A multipartite virus infects the boot sector and a file.