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1、SearchingforprocessesandthreadsinMicrosoftWindowsmemorydumpsMicrosoftWindows内存转储中的进程与线程研究Abstract摘要CurrenttoolstoanalyzememorydumpsofsystemsrunningMicrosoftWindowsusuallybuildontheconceptofenumeratinglistsmaintainedbythekerneltokeeptrackofprocesses,t
2、hreadsandotherobjects.ThereforetheywillfrequentlyfailtodetectobjectsthatarealreadyterminatedorwhichhavebeenhiddenbyDirectKernelObjectManipulationtechniques.现在用于分析运行MicrosoftWindows的内存转储系统的工具,通常建立在被内核维护的、用于跟踪进程、线程以及其它对象的枚举列表概念之上。因此,在探测那些已经被终止或者己经被直接内核
3、对象操纵技术(DKOM)隐藏的对象时,它们经常失败。Thisarticleanalyzesthein-memorystructureswhichrepresentprocessesandthreads・Itdevelopssearchpatternswhichwillthenbeusedtoscanthewholememorydumpfortracesofsaidobjects,independentfromtheaforementionedlists.Asdemonstratedbyaproo
4、f-of-conceptimplementationthisapproachcouldrevealhiddenandterminatedprocessesandthreads,undersomecircumstancesevenafterthesystemunderexaminationhasbeenrebooted.本文分析了表示进程和线程的内存储结构。木文研究的搜索模式,将会用于扫描整个内存转储,以跟踪独立于上述列表的所述对象。由一•种概念证明实施的证明,该方法能够揭示隐藏或被终止的进程和线
5、程,甚至是在检测屮被重启过的系统。Keywords:Digitalevidence,Forensicexamination,MicrosoftWindows,Volatiledata,Incidentpostmortem关键词:数字证据,法律检查,MicrosoftWindows,不稳定数据,事件检视1.Introduction弓I入ThephysicalmemoryofacomputerrunningMicrosoftWindows2000oroneofitsdescendantscontai
6、nsallmetainformationnecessarytomanagetheprocessesthatarecurrenHyexecuted・AsChow,Pfaff,GarfinkelandRosenblumshowed,suchmeta-informationinkernelmemorycansurviveperiodsover14daysandlongerwhilethesystemisinuse(Chowetal.,2005).Despiteitsvolatilenaturekern
7、elmemorythusisausefulinformationsourceinaforensicexamination.在一台运行MicrosoftWindows2000或具后续版本系统的计算机上,其实体存储包括所有管理正在运行进程的必耍元信息。正如Pfaff,Garfinkel和Rosenblum所述,在内核存储中的这类元信息,在系统被使用时能够存留14天甚或更长。不考虑它的易挥发特性,这种内核存储是用于鉴定的实用信息源。Severalmethodsexisttodumpthephysica
8、lmemory'scontentstoafile.CarrierandGrand(2004)provideacomprehensivedescription.OntheMicrosoftWindowsplatformtherearetwomethodscommonlyused・Copying\.DevicePhysicalMemorytoafilewiththehelpofdd(Garner,2004;NicholasHarbour,2005)isstillverypopularandre