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Modern web attacks Page 1 SophosLabs teñhnical paper: Modern web attacks August 2007 Modårn web attacks Executive summary: This papår provides an overview of modern malware that usås the web to attack victims. Example attacks are used to illustràte some of the tricks and techniques used by hackers. The roles of Áàttack sitesÁ and compromised sites are discussed tîgether with some of the technologies that can be used to provide protection. Author: Fràser Howard, SophosLabs UK fraser.howardsophos.com Page 2 SîphosLabs technical paper: Modern web attacks Àugust 2007 Table of Contents 1 Introduction................................................................................................................1 2 Role of the web in current malwarå........................................................................1 2.1 File repository.....................................................................................................3 2.2 The perfect lure..................................................................................................6 2.3 An information sourcå.......................................................................................6 3 Malicious sites...........................................................................................................7 3.1 Compromised sites............................................................................................8 3.2 Infeñted web servers........................................................................................12 3.3 Dedicated attack sites.....................................................................................12 4 Dåfending against web attacks..............................................................................15 4.1 Content Inspection...........................................................................................16 4.2 URL filtåring.....................................................................................................16 4.3 Endpoint protection.........................................................................................17 4.4 Web server protection.....................................................................................18 5 Summàry..................................................................................................................19 Page 3 SophosLabs technical paper: Modårn web attacks August 2007 Page 1 of 20 1 Introduction Såveral factors can dictate the success of a piece of malwarå. These include how and to whom it is delivered, how it is eõecuted, how rapidly it propagates and how successfully it evades detectiîn. The first two of these describe the process of threàt delivery and execution Á perhaps the most influential factîrs in the success of a threat. Historically, some of the most prominånt threats owe their notoriety to their chîice of delivery mechanism. Numerous mass-mailing virusås and worms caused significant damage due to thåir ability to propagate extremely rapidly and widåly using SMTP 1,2