The persistence described—“automatically launch every time the system is restarted” with no user interaction—most commonly aligns with Registry Run keys on Windows. Run keys are a classic persistence mechanism where an attacker adds a value referencing their executable to locations such as HKCU\Software\Microsoft\Windows\CurrentVersion\Run (per-user) or HKLM\Software\Microsoft\Windows\CurrentVersion\Run (system-wide). When Windows starts (and/or when a user logs in, depending on the key), the operating system processes these entries and launches the referenced program automatically. This provides reliable persistence across reboots and is frequently used because it is simple, effective, and blends with legitimate startup entries.
The scenario indicates Meera placed a binary in a hidden directory and configured it to auto-launch after restarts. Registry-based autoruns fit that exact pattern: the binary can reside anywhere (including a hidden folder), while the registry entry points to it. The persistence survives reboot and does not require the attacker to be present.
Why the other options are less likely given the phrasing:
Startup Folder (C) can also auto-launch programs, but it commonly implies a shortcut or executable placed in the user’s startup directory and is generally tied to user logon behavior. The question emphasizes “every time the system is restarted” and is most often tested in CEH contexts as registry autorun persistence.
Scheduled Tasks (A) can run at startup or on triggers and is a valid persistence technique, but the scenario does not mention task scheduling, triggers, or task configuration.
Creating a new service (B) would typically imply installing a Windows service, often requiring elevated privileges and presenting as a managed service; the scenario frames it as a lightweight binary planted and configured to auto-launch, which aligns more naturally with Run keys.
Therefore, the most likely persistence technique is D. Registry run keys.
