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Unformatted text preview: ¡14] KWWS://KDQGOhUV.VDQV.RUJ/MXOOULF K/ShUOERW.KWPO 11/7/11 proquest.safaribooksonline.com/print?xmlid=9780321553744« 2/2 proquest.safaribooksonline.com/print?xmlid=9780321553744« Self-XpdaWe componenW : doZnloadV XpdaWeV Wo Whe boW VofWZaUe Wo eiWheU (1) enWiUel\ XpdaWe Whe boW binaU\, (2) Veed an XpdaWe foU coYeUW commXnicaWion, (3) geW Whe laWeVW Vhell code WhaW e[ploiWV a YXlneUabiliW\ b\ Zhich Whe boW can VpUead iWVelf, oU (4) obWain a neZ pol\moUphic engine foU eYading deWecWion. (Pol\moUphic engineV aUe deVcUibed bUiefl\ in SecWion 7.3.2 .) Of coXUVe, noW all boWV aUe cleanl\ modXlaUi]ed, and Whe pUeYioXVl\ menWioned componenWV aUe noW alZa\V pUeVenW in all boWV. GaoboW ¡ 345 ¢ iV a noWable e[ample of a modXlaU boW. ModXlaU boWV haYe geneUall\ incUeaVed in popXlaUiW\ becaXVe Whe\ aUe eaV\ Wo XpdaWe, WheUeb\ alloZing boW ZUiWeUV Wo e[Wend pUeYioXV fXncWionaliW\. 11/7/11 proquest.safaribooksonline.com/print?xmlid=9780321553744« 1/4 proquest.safaribooksonline.com/print?xmlid=9780321553744« UVeuname: LibeUW\ uniYeUViW\ Book: CUimeZaUe: undeUVWanding NeZ AWWackV and DefenVeV. No paUW of an\ chapWeU oU book ma\ be UepUodXced oU WUanVmiWWed in an\ foUm b\ an\ meanV ZiWhoXW Whe pUioU ZUiWWen peUmiVVion foU UepUinWV and e[ceUpWV fUom Whe pXbliVheU of Whe book oU chapWeU. RediVWUibXWion oU oWheU XVe WhaW YiolaWeV Whe faiU XVe pUiYilege XndeU u.S. cop\UighW laZV (Vee 17 uSC107) oU WhaW oWheUZiVe YiolaWeV WheVe TeUmV of SeUYice iV VWUicWl\ pUohibiWed. violaWoUV Zill be pUoVecXWed Wo Whe fXll e[WenW of u.S. FedeUal and MaVVachXVeWWV laZV. 7.4. Web Bots and the General Future of Botnets ThiV VecWion deVcUibeV poVVible neZ appUoacheV Wo boW deVign. TheVe appUoacheV haYe been diVcXVVed in open foUXmV among UeVeaUcheUV, and Whe\ UepUeVenW YaUioXV WacWicV WhaW fXWXUe boW ZUiWeUV mighW emplo\ and WhaW ma\ need Wo be conVideUed Zhen deYeloping coXnWeUmeaVXUeV. we begin b\ diVcXVVing bUoZVeU-baVed boWV, and When moYe on Wo moUe geneUal fXWXUe boW deVign conVideUaWionV. 7.4.1. Botnets 2.0: BroZser-Based Bots TUadiWional boWV aUe YieZed aV clienW-Vide e[ecXWableV WhaW UXn diUecWl\ on Wop of Whe opeUaWing V\VWem. One poWenWial mechaniVm foU fXWXUe boWV iV Wo haYe Whem UXn inVide a Zeb bUoZVeU. In VXch a caVe, Whe boW ZoXld be implemenWed in Vome clienW-Vide VcUipWing langXage WhaW a bUoZVeU can inWeUpUeW (e.g., JaYaScUipW). we deVcUibe WhiV appUoach heUe baVed on Whe e[poViWion giYen in a papeU b\ JackVon eW al. ¡ 195 ] and a Walk b\ Adam BaUWh ¡ 34 ]. TheUe aUe VeYeUal ke\ diffeUenceV beWZeen WUadiWional boWneWV and bUoZVeU-baVed boWneWV: InfecWion dXraWion. TUadiWional boWV mainWain a peUViVWenW infecWed VWaWe on WheiU hoVWV. The hoVW Zill conWinXe Wo UXn boW VofWZaUe XnWil iW iV diVinfecWed (e.g., WhUoXgh anWiYiUXV VofWZaUe). BUoZVeU boWV, b\ conWUaVW, UXn onl\ dXUing Whe coXUVe of a Zeb bUoZVing VeVVion. AV Voon aV Whe bUoZVeU iV cloVed, Whe boW WeUminaWeV. TheUefoUe, Whe amoXnW of Wime in Zhich a bUoZVeU boW can do damage (and Whe Vcope of iWV damage) iV limiWed. limiWed....
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