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Which type of malicious software replicates itself to spread to other computers, often using a network?
Worm
Logic Bomb
Adware
Backdoor
Worm
A computer worm is a standalone malware program that replicates itself to spread to other computers, typically utilizing a computer network to spread by exploiting security vulnerabilities. Unlike a virus, it does not require a host program or human intervention to propagate.
ISO/IEC 27001:2013
A computer worm is a standalone malware program that replicates itself to spread to other computers, typically utilizing a computer network to spread by exploiting security vulnerabilities. Unlike a virus, it does not require a host program or human intervention to propagate.
N(t)=N0тАЛe╬╗t тАФ represents the growth rate of infection over time t, where N0тАЛ is the initial count and ╬╗ is the spread constant.
Worms operate by scanning the network for vulnerable systems using protocols like TCP/IP. Once a vulnerable host is identified, the worm executes a payload and copies its binary code to the target system. This process is often recursive, leading to exponential growth in infected nodes, represented by the model N(t)=N0тАЛe╬╗t, where ╬╗ is the replication rate.
Worms consume network bandwidth, leading to performance degradation.
They do not attach themselves to existing executables like viruses.
Propagation is autonomous and does not require user action.
Worms often exploit vulnerabilities in services such as SMB, RPC, or email clients.
Useful for security researchers to study network resilience (simulated environments).
High potential for denial-of-service (DoS) conditions.
Unauthorized access and data exfiltration.
Difficult to eradicate once a network segment is fully compromised.
None in a positive sense; primarily a threat vector in cybersecurity.
Logic Bomb: A piece of code intentionally inserted into a software system that will set off a malicious function when specified conditions are met.
Adware: Software that automatically displays or downloads advertising material when a user is online.
Backdoor: A secret method of bypassing normal authentication or encryption in a computer system or cryptosystem.
A is correct тАФ A worm is specifically defined by its ability to replicate and propagate autonomously across network infrastructures.
In exams, always distinguish between a virus (requires a host file to execute) and a worm (standalone, network-aware) to avoid common pitfalls in malware classification questions.