Definition of Rootkit:
A rootkit is a type of malicious software designed to provide continued privileged access to a computer while actively hiding its presence. Rootkits can be installed at the hardware, firmware, or software level of a system.
[Reference: "Rootkits and Bootkits: Reversing Modern Malware and Next Generation Threats" by Alex Matrosov., Sophisticated Stealth Mechanisms:, Rootkits often employ sophisticated techniques to remain undetected by traditional security measures, such as antivirus software and intrusion detection systems., Reference: "The Rootkit Arsenal: Escape and Evasion in the Dark Corners of the System" by Bill Blunden., Manipulating System Processes:, Rootkits can deeply embed themselves in the system, allowing them to manipulate system processes, such as altering transaction values and transferring funds without detection., Reference: NIST SP 800-83, Guide to Malware Incident Prevention and Handling., Impact on Financial Systems:, In the context of the bank's transaction processing system, the rootkit's ability to alter transaction values intermittently and subtly makes it difficult to detect, thus causing financial losses over time., Reference: SANS Institute's "Understanding Rootkits and How to Defend Against Them.", Given the description of the malware's behavior, a rootkit best fits the type of malware used in this security breach., , ]
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