Tag: science & technology

Cavity viruses infect executable files by inserting their code into unused spaces (cavities) within the file, which means they don't change the file's overall size. This stealth technique helps avoid detection based on file size changes. The other options are either made-up terms or unrelated attacks (XSS Worm is a web vulnerability, not a file virus type).

Bait files (also called goat files) are dummy files created by antivirus researchers to attract and analyze virus infections. These files help study virus behavior without risking important data. The other terms are not standard antivirus terminology - trap files might seem plausible but bait files is the correct industry term.

A virus signature is a unique byte pattern or sequence of code that antivirus software uses to identify specific viruses. It's like a fingerprint that allows detection of known malware.

A polymorphic virus changes its code (decryption module) on each infection to avoid detection by signature-based antivirus. Option B correctly identifies that the decryption module is modified, while A incorrectly states the encryption module changes.

CiaDoor is a notorious virus/malware that specifically disables critical system tools including System Restore, Task Manager, and Command Prompt to prevent users from removing it. W32/Similie and Chernobyl are different types of malware, and XORing is an encryption technique.

Metamorphic viruses completely rewrite their code with each infection while maintaining functionality, making them extremely difficult to detect via signature-based methods. Polymorphic viruses only change their decryption routine while keeping the same virus body. HIV is a biological virus, not computer malware.

Bliss is a documented Linux computer virus that emerged in 1997, demonstrating that while Linux is more virus-resistant than Windows due to its permission structure, it's not completely immune. CIH (Chernobyl) is a Windows-specific virus. XSS Worm is a web vulnerability exploit, not a traditional virus.

When optical media like CDs and DVDs are closed (finalized), they become read-only and cannot be modified or written to again. This makes them immune to virus infection after finalization, provided no infected files were already on them when burned. This is a key advantage of optical media for long-term backups.

Venus is the hottest planet in our solar system with surface temperatures around 465°C, despite Mercury being closer to the Sun. Venus's thick carbon dioxide atmosphere creates an extreme greenhouse effect that traps heat. This makes it significantly hotter than Mercury or any other planet.

Jupiter has an average density of about 1.33 g/cm³, which is less than Earth's 5.51 g/cm³. This is because Jupiter is primarily composed of hydrogen and helium gases rather than rocky materials. The statement is true despite Jupiter's much greater mass and size.