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Method and device for feature extraction

a feature extraction and feature technology, applied in the field of network security, can solve the problems of increasing the variety of malicious code attacks on the mobile phone, increasing the number of mobile phone viruses, and the deep suffering of smart mobile phone users, and achieve the effect of fast and accurate feature extraction

Inactive Publication Date: 2017-07-27
BEIJING QIHOO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a method for fast and accurate feature extraction by only using functions appearing in the black sample files and not the white sample files. This guarantees the efficient construction of a feature library and the implementation of defending technologies. The features are optimized to detect most files with the least features after acquiring a large amount of extractable black sample features. The technical effects of the invention are improved efficiency and accuracy in feature extraction for various applications.

Problems solved by technology

However, that also brings increasing varieties of malicious code attacks to the mobile phones and increasingly serious personal data security issues.
Smart mobile phone users suffer deeply from more and more mobile phone viruses.

Method used

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  • Method and device for feature extraction
  • Method and device for feature extraction
  • Method and device for feature extraction

Examples

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Embodiment Construction

[0015]Hereinafter, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. Although the drawings reveal the exemplary embodiments of the present disclosure, it should be understood that the present disclosure may be implemented in various forms and should not be limited by the embodiments illustrated here. On the contrary, these embodiments are provided for a more thorough understanding of the present disclosure and for a complete delivery of the scope of the present disclosure to those skilled in the art.

[0016]Android operating system, as an example, contains an application layer (app layer) and a system framework layer (framework layer); As for other layers that might be comprised in terms of functional partitioning, will not be discussed here. Wherein, the app layer may be generally understood as an upper layer, in charge of interfaces for interaction with a user, e.g., application maintenance, identifying diff...

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Abstract

The present invention discloses a method and device for feature extraction, wherein the method comprises acquiring a batch of black sample files and white sample files from an application layer of a smart terminal operating system; parsing each file to obtain information structure of all functions contained in each file, and computing a check code of each function; determining whether each file contains functions corresponding to respective check codes so as to count times that each function appears in the black sample files and white sample files; extracting black sample features based on functions only appearing in the black sample files while not appearing in the white sample files, or extracting white sample features based on functions only appearing in the white sample files while not appearing in the black sample files. By analyzing and computing the acquired black sample files and white sample files and counting the times that a check code of each function appears in the files, the embodiments of the present invention only use the functions appearing in the black sample files while not appearing in the white sample files as the basis for feature extraction.

Description

FIELD OF THE INVENTION[0001]The present invention relates to the technical field of network security, and more specifically relates to a method and device for feature extraction.BACKGROUND OF THE INVENTION[0002]With the development of sciences and technologies, smart terminals are provided with more and more functions. For example, mobile phones have turned from traditional GSM and TDMA digital mobile phones into smart phones that have capabilities of processing multimedia resources and providing various kinds of information services such as network browsing, telephone conference, electronic commerce, etc. However, that also brings increasing varieties of malicious code attacks to the mobile phones and increasingly serious personal data security issues. Smart mobile phone users suffer deeply from more and more mobile phone viruses.[0003]Mobile phone malicious code protection technologies perform protection against malicious codes. A variety of mobile phone malicious code protection ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04L29/06G06F21/56
CPCH04L63/1425G06F21/566G06F21/563G06F21/562G06F21/56Y04S40/20
Inventor YANG, KANGCHEN, ZHUOTANG, HAI
Owner BEIJING QIHOO TECH CO LTD
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