For the realization of the automatic capture function of the file type virus, another method can also be adopted-the encryption extraction method. The implementation of various operations of computer viruses is dependent on the competition for the control of the system operation, and the acquisition of the operation control of the file virus system is dependent on the operation of the executable file. The file virus is mainly contagious after obtaining the control of the system operation Attack objects are executable files within the scope of system management. At this time, these executable files are generally static (that is, these files are not resident in memory and are in an execution state, but are stored on disk like other data files. This At the same time, these static executable files can be processed as data information by other program processes that are resident in memory and executed in the same way as general data files). In view of the fact that the file viruses known so far cannot determine whether the infected executable file is in the form of ciphertext (the information file encrypted by a certain key), imagine that if the executable file is stored statically A specific code conversion process is added to the process that the media is transferred into the memory and becomes the execution state, which means that the executable file is stored on the disk in ciphertext (the ciphertext form of the executable file here is through a certain encryption algorithm Encrypt the binary code in the executable file), before being transferred to the system memory, it must be generated by a specific decryption algorithm in a clear text form that can be directly executed. It must be pointed out that the encryption and decryption key for the executable file Must be flexible and unpredictable.
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