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1、分基于进程和通信隐藏的木马设计与实现论文作者姓名:申请学位专业:申请学位类别:指导教师姓名(职称):论文提交日期:第22页共23页基于进程和通信隐藏的木马设计与实现摘要近年来,特洛伊木马等恶意代码己经成为网络安全的重要威胁。很多国家都采取积极的网络安全防御措施,投入大量的人力和物力研究网络信息安全技术。文章首先分析了传统木马的一般工作原理及其植入、加载、隐藏等关键技术。随着网络技术的不断更新和发展,木马技术也在不断地更新换代,现代木马的进程隐藏和通信隐藏等等都发生了变化。进程的隐藏和通信的隐藏一直是木马
2、程序设计者不断探求的重要技术。攻击者为达到进程隐藏的目的,采用远程线程和动态链接库,将木马作为线程隐藏在其他进程中。选用一般安全策略都允许的端口通信,如80端口,则可轻易穿透防火墙和避过入侵检测系统等安全机制的检测,从而具有很强的隐蔽性。本文研究了如何将Windows环境下的动态链接库(DLL)技术与远程线程插入技术结合起来实现特洛伊木马植入的新方案。在该方案中,提出了特洛伊木马程序DLL模块化,并且创建了独立的特洛伊木马植入应用程序,将木马程序的DLL模块植入宿主进程。实验结果证明该方案能实现的木马植
3、入,具有很好的隐蔽性和灵活性。关键词:特洛伊木马;动态连接库;进程插入;远程线程第22页共23页TheDesignandImplementationofTrojanHorsesBaseonProcessHidingandCommunicationsHidingAbstractInrecentyears,maliciouscodesincludingTrojanhavethreatenednetworkinformationsecurity,andmoreandmorecountriespaidatten
4、tiontotakeactivemeasurestoprotectthenetwork,andspentalotinresearchtodevelopnetworkinformationsecuritytechnologymentallyandmaterially.Thispaperfirstlyanalysesthebasicprinciple,entrytechnology,loadtechnologyandhidingtechnologyoftraditionalTrojanhorse.Witht
5、hedevelopmentofnetworktechnology,Trojanhorsetechnologyisupgradingconstantly.ModernTrojanhorseischangedinprocesshidingandcommunicationhiding.TheprocesshidingandcommunicationshidingareimportanttechnologybeingexploredbyTrojanhorseprogrammersalllong.Adopting
6、themeasureofdynamiclinkstorage,andRemoteThreadtechnology,andhidingTrojanhorsebehindtheotherprocessesasathreadprogram,itiseasytohide.Choosingtheportcorrespondencewhichispermittedbyalmostalltheordinarysecuritypolicy,likes80port,mayeasilypenetratethefirewal
7、landavoidtheexamineofsecuritysystemsasinvasion-checkingmechanismsandsoon.Thus,ithasaverystrongcovered.ThispaperisimplementedtheinjectionofTrojanhorsebycombiningthetechnologyofDLL(dynamiclinkinglibrary)andofremotethreadinjectionontheWindowsplatform.Inthis
8、paper,modularizationofTrojanhorseprocessisproposedtocreateanindependentTrojanhorseinjectionprocess,thus,toinjectTrojanhorseDLLmoduletothehostprocess.ExperimentalresultsshowthattheprogramcouldrealizetheTrojaninjectedwithgoo