A Crawler-based Study of Spyware in the Web. Alex Moshchuk, Tanya Bragin, Steve Gribble, Hank Levy
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1 A Crawler-based Study of Spyware in the Web Alex Moshchuk, Tanya Bragin, Steve Gribble, Hank Levy
2 What is spyware? Broad class of malicious and unwanted software Steal control of a PC for the benefit of a 3 rd party Characteristics: Installs without user knowledge or consent Hijacks computer s resources or functions Collects valuable information and relays to a 3 rd party Resists detection and uninstallation
3 You know it when you see it
4 How do people get spyware? Spyware piggybacked on popular software Kazaa, edonkey Drive-by downloads Web page installs spyware through browser With or without user consent Trojan downloaders Spyware downloads/installs more spyware
5 Why measure spyware? Understand the problem before defending against it Many unanswered questions What s the spyware density on the web? Where do people get spyware? How many spyware variants are out there? What kinds of threats does spyware pose? New ideas and tools for: Detection Prevention
6 Approach Large-scale study of spyware: Crawl interesting portions of the Web Download content Determine if it is malicious Two strategies: Executable study Find executables with known spyware Drive-by download study Find Web pages with drive-by downloads
7 Outline Introduction Executable file study Drive-by download study Summary Conclusions
8 Analyzing executables Web crawler collects a pool of executabes Analyze each in a virtual machine: Clone a clean WinXP VM Automatically install executable Run analysis to see what changed Currently, an anti-spyware tool (Ad-Aware) Average analysis time 90 sec. per executable
9 Executable study results Crawled 32 million pages in 9,000 domains Downloaded 26,000 executables Found spyware in 12.3% of them Most installed just one spyware program Only 6% installed three or more spyware variants Few spyware variants encountered in practice 142 unique spyware threats
10 Main targets Visit a site and download a program What s the chance that you got spyware? news kids random pirate music and movies wallpapers and screensavers games celebrities blacklisted % of executables that are infected
11 Popularity A small # of sites have large #of spyware executables: A small # of spyware variants are responsible for the majority of infections:
12 Types of spyware Quantify the kinds of threats posed by spyware Consider five spyware functions What s the chance an infected executable contains each function? Keylogger Dialer Trojan downloader Browser hijacker Adware 0.05% 1.2% 12% 62% 88%
13 Example of a Nasty Executable Let all your worries melt away into this collection of clouds in the sky 100% free! Installs 11 spyware programs initially Includes a trojan downloader; continually installs more spyware 10 more within first 20 minutes 12 new items on desktop, 3 browser toolbars Shows an ad for every 1.5 pages you visit CPU usage is constantly 100% No uninstallers Ad-Aware can t clean System stops responding in 30 mins Restarting doesn t help Unusable system and no screensaver!
14 Outline Introduction Executable file study Drive-by download study Summary Conclusions
15 Finding drive-by downloads Evaluate the safety of browsing the Web Approach: automatic virtual browsing Render pages in a real browser inside a clean VM Internet Explorer Mozilla Firefox Identify malicious pages Define triggers for suspicious browsing activity Run anti-spyware check only when trigger fires
16 Event triggers Real-time monitoring for non-normal behavior: Process creation File events Example: foo.exe written outside IE folders. Registry events Example: new auto-start entry for foo.exe No false negatives (theoretically) 41% false positives: Legitimate software installations Background noise Spyware missed by our anti-spyware tool
17 More on automatic browsing Caveats and tricks Restore clean state before navigating to next page Speed up virtual time Monitor for crashes and freezes Deciding what to say to security prompts: yes Emulate user consent no (or no prompt) Find security exploits
18 Example of a security exploit Ads <iframe 1> Check browser and referrer Help ActiveX Control C:\windows\helpctr\tools.htm <iframe 2> <object 1> <object 2> inject code Local help objects bypass security restrictions; unsecured local zone Cross-zone scripting vulnerability in ActiveX Help allows JavaScript to inject code into a local help control JavaScript; VBscript GET save as c:\calc.exe run
19 Drive-by download results (unpatched Internet Explorer, unpatched WinXP) Examined 50,000 pages 5.5% carried drive-by downloads 1.4% exploited browser vulnerabilities news kids random browser exploits with user consent wallpapers and screensavers celebrities blacklist music and movies games pirate % of pages with drive-by downloads
20 Types of spyware Is drive-by download spyware more dangerous? Keylogger Dialer Trojan Downloader Browser hijacker Adware Executables 0.05% 1.2% 12% 62% 88% Drive-by Downloads 0% 0.2% 50% 84% 75%
21 Is Firefox better than IE? Repeat drive-by download study with Mozilla Firefox Found 189 (0.4%) pages with drive-by downloads All require user consent All are based on Java Work in other browsers Firefox is not 100% safe However, much safer than IE adult celebrity games kids music news pirate random wallpaper blacklist Total:
22 Summary Lots of spyware on the Web 1 in 8 programs is infected with spyware 1 in 18 Web pages has a spyware drive-by download 1 in 70 Web pages exploits browser vulnerabilities Most of it is just annoying (adware) But a significant fraction poses a big risk Spyware companies target specific popular content Most piggy-backed spyware in games & celebrity sites Most drive-by downloads in pirate sites Few spyware variants are encountered in practice
23 Conclusion and Future Work Addressed key questions about spyware Built useful tools and infrastructure More details: A Crawler-based Study of Spyware in the Web NDSS06 Looking forward: Real-time protection with a trigger-based Web proxy Automatically detect new spyware Use triggers as truth Increase the scale of the study Study change of spyware over time (see paper!)
24 Questions?
A Crawler-based Study of Spyware on the Web
A Crawler-based Study of Spyware on the Web Alexander Moshchuk, Tanya Bragin, Steven D. Gribble, and Henry M. Levy Department of Computer Science & Engineering University of Washington {anm, tbragin, gribble,
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