Which virus actively alters and corrupts service call interruptions?

• A. Boot Sector Virus
• B. Tunneling virus
• C. Ransomware
• D. UAC

Answer: (B)

Interacting with the operating system through service calls and interrupts is a common target for stealthy malware. A tunneling virus attaches itself to these system calls by intercepting or rerouting the interrupts that the OS uses to perform services. By tunneling the request through its own code, the virus can run first, perform its malicious actions, and then pass control back to the legitimate OS routine, potentially corrupting the flow of service calls or hiding from detection. This active manipulation of how the OS handles interrupts and service requests is what tunneling describes, making it the best fit for “actively alters and corrupts service call interruptions.”

Boot sector viruses focus on the boot record to run before the OS starts, not specifically on service call handling. Ransomware aims to encrypt data and demand a ransom, rather than targeting how the OS processes service calls. UAC is a security feature rather than malware.