Network Attack Detection via Unique Identifier Caching
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Solution Overview
Problem
Current communication network management systems face challenges in detecting client-side attacks due to difficulties in processing complex file formats and extensive evasion capabilities, leading to unrealistic processing requirements and overhead, especially when trying to maintain full detection at wire-speed.
Innovation Solution
A system that generates unique identifiers for data blocks, determines their legitimacy, and selectively calls file-type specific detection nuggets for full file inspection, optimizing processing by skipping unnecessary inspections and issuing alerts for malicious files, while utilizing a dispatcher to manage detection and routing of files to appropriate detection components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If full file inspection is performed on all data blocks to detect client-side attacks, then detection effectiveness is improved, but processing time and system overhead become unrealistic
Solution Approach 1:
The system generates unique identifiers (hash values) for data blocks and stores them in a cache with their detection status before full inspection is needed. When the same data block is encountered again, the pre-stored identifier enables immediate recognition and skipping of full inspection, thus performing preliminary work to avoid redundant processing time while maintaining detection effectiveness.
Solution Approach 2:
Instead of performing full file inspection on every data block, the system creates and stores a simplified copy representation (unique identifier/hash value) of the data block content. This copy serves as a surrogate for the actual file inspection, allowing the system to verify data blocks through identifier matching rather than repeated full inspections, thereby reducing processing time while maintaining detection reliability.
2Reliability
If vendor-specific detection systems are implemented to detect attacks, then detection capability is improved, but system complexity and data exchange overhead increase
Solution Approach 1:
The system implements a universal cache mechanism that stores unique identifiers and detection status applicable across all detection systems. This universal approach allows different vendor-specific detection systems to share detection results through a common interface (the cache), reducing system complexity and data exchange overhead while maintaining enhanced detection capability through collaborative detection efforts.
Solution Approach 2:
The cache acts as an intermediary between multiple vendor-specific detection systems. Instead of having complex direct communication between detection systems, the cache mediates by storing and sharing unique identifiers and detection status, simplifying the overall system architecture while enabling coordinated detection across multiple vendors' systems.
3Speed
If data blocks are inspected in serial manner to maintain wire-speed processing, then processing speed is maintained, but detection completeness for complex file formats deteriorates
Solution Approach 1:
The system creates unique identifier copies of data blocks that can be rapidly compared without requiring serial inspection of the entire file content. This allows the system to maintain wire-speed processing through fast identifier matching while achieving complete detection by eventually performing full inspection on unidentified data blocks, thus resolving the contradiction between speed and detection completeness.
Solution Approach 2:
The system performs preliminary identifier generation and caching of data blocks before full inspection is required. This preliminary action enables the system to quickly identify and skip previously inspected data blocks, maintaining processing speed while ensuring that all unique data blocks receive complete inspection attention, thereby achieving both speed and detection completeness.
Data Source
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AI summary
A system includes a processor. The processor is configured to receive network traffic that includes a data block. The processor will generate a unique identifier (UID) for the file that includes a hash value corresponding to the file. The processor will determine whether the file is indicated as good or bad with the previously-stored UID. The processor will call a file -type specific detection nugget corresponding to the file's file -type to perform a full file inspection to detect whether the file is good or bad and store a result of the inspection together with the UID of the file, when the file is determined to be not listed in the previously-stored UIDs. The processor will not call the file-type specific detection nugget when the file's indicator is "good" or "bad" in the previously-stored UIDs. The processor will issue an alert about the bad file when the file's indicator is "bad".