What technique do attackers use with rootkits to maintain persistent control over a system?

The technique that attackers use with rootkits to maintain persistent control over a system is DLL Injection. This method involves inserting a dynamic link library (DLL) into the address space of another process, thus allowing the attacker to execute their code within the context of a legitimate application. By doing so, attackers can manipulate system functions, extract sensitive information, and remain hidden from detection tools, which may not monitor the actions occurring within trusted processes.

Rootkits often rely on this technique to remain stealthy while controlling various aspects of the infected system. Once a rootkit is installed, it often employs DLL Injection to maintain its presence, ensuring that it can execute its code and sustain control even after system reboots or security scans.

Other options, while related to security and attacks, do not directly pertain to the mechanism by which rootkits achieve persistence. Spoofing focuses on deceiving users or systems into believing one entity is another, such as impersonating someone else. Phishing is primarily about tricking individuals into providing sensitive information through social engineering techniques. Malware obfuscation is the practice of making malicious code difficult to detect or understand, but it is not intrinsically linked to the method of maintaining persistent control like DLL Injection is with rootkits.