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1 Computer Security Symposium October 2014 Firefox {kazushi, Web Firefox Firefox Firefox Investigation on Attack and Stealth Methods by Malicious Firefox Extensions Kensuke Takahashi Kazushi Tahakashi Yoshihiro Oyama The University of Electro-Communications Chofugaoka, Chofu-shi, Tokyo , JAPAN {kazushi, Abstract Threats by malicious Firefox extensions are widely spread. In this paper, we report an investigation on attack methods using a malicious Firefox extension and stealth methods to prevent the extension from being noticed by an attack target. We confirm the behavior of a malicious Firefox extension that is implemented using some of the investigated methods, and point out the necessity of countermeasures against malicious Firefox extensions. 1 Web Web Web Mozilla Firefox Man-in-the-Browser Web Web [1]Estehghari [2] Mozilla [3] 1 Firefox

2 Firefox Firefox Mozilla addons.mozilla.org (AMO) AMO Firefox Mozilla AMO Firefox Firefox Mozilla Firefox Firefox Firefox 年間登録数 : 2 Firefox Firefox 2 DOM Web XPCOM Firefox OS 2.1 Firefox Firefox 2 Firefox 2 XUL Mozilla Firefox UI XBL XUL UI JavaScript Firefox XPCOM Firefox XPConnect JavaScript XUL JavaScript Firefox OS

3 Operating System Firefox Web ページ DOM& Scripts JavaScript XBL XUL 拡張機能 XPConnect XPCOM 2: Firefox ([4] ) 2.2 DOM Web DOM Web DOM Web HTML Web Web Web HTML URL URL location URL Web Web JavaScript onkeydown on- Click ID XMLHttpRequest HTTP POST 2.3 XPCOM XPCOM Chrome Chrome XUL JavaScript Firefox OS Firefox Chrome Web XPCOM XPCOM nsi mozi XPCOM Firefox nsinavhistoryservice nsinavbookmarksservice

4 nsicookie- Manager nsilogin- Manager nsilocalfile nsi- Clipboard nsiprocess Firefox XPCOM 3 1 Firefox ID 3.1 Firefox JSON Firefox JSON JSON ID Firefox ID ID JSON ID ID ID AMO Extension Defender [5] Extension Defender Firefox ID AMO Extension Defender 3.2 UI Firefox Firefox UI UI

5 4 2 3 Firefox 4.1 3: Firefox 3.3 Android [6] Firefox xpi xpi zip AMO UI onkeydown Web location.href Web URL nsiclipboard UI XMLHttpRequest Java- Script Node HTTP XMLHttpRequest JSONP XMLHttpRequest

6 1: Browser Mozilla Firefox 31.0 Mozilla Firefox 31.0 OS Microsoft Windows 7 Microsoft Windows 7 SP1 (64bit) SP1 (64bit) RAM 8GB 4GB CPU Intel Core i AMD E-350 Runtime - Node.js v Firefox Web Web 4 Web 5 Firefox 5 Extension Defender Extension Defender Firefox Extension Defender 6 JSON ID ID ID Extension Defender 6 ID 4: ( : : ) 5: UI ( : : ) 6: Extension Defender ( : : )

7 4.3 Firefox Firefox Firefox 1 AMO AMO Firefox Firefox AMO 1 Google Chrome Chrome [7] Mozilla AMO Firefox 2 Firefox XPCOM Chrome URL Google Chrome Internet Explorer XPCOM ActiveX 5 Firefox Firefox Louw [8] Firefox XPCOM XPCOM DOM Wang [9] Firefox DOM XPCOM AMO 2465 Web 108 Beaucamps [10] Firefox XP- COM Firefox Internet Explorer ActiveX Firefox

8 6 Firefox Firefox Firefox AMO Firefox Firefox [1],,. Man-in-the- Browser. 32 3, [2] Saghar Estehghari, Yvo Desmedt. Exploiting the Client Vulnerabilities in Internet E-voting Systems: Hacking Helios 2.0 as an Example. In Proceedings of the 2010 Electronic Voting Technology Workshop and Workshop on Trustworthy Elections (EVT/WOTE), [3] :: Add-ons for Firefox firefox/blocked/ [4] Wade Alcorn, Christian Frichot, Michele Orru. The Browser Hacker s Handbook, pp.315, [5] Extension Defender :: Add-ons for Firefox firefox/addon/extension-defender/ [6] Peter Yan. A Look at Repackaged Apps and their Effect on the Mobile Threat Landscape. TrendLabs Security Intelligence blog, trendlabs-security-intelligence/alook-into-repackaged-apps-andits-role-in-the-mobile-threatlandscape/ [7] Developer Relations Team. Chrome Chrome. Google Developer Relations Japan Blog, /03/chrome-chrome.html [8] Mike Ter Louw, Jin Soon Lim, V. N. Venkatakrishnan. Enhancing web browser security against malware extensions. Journal in Computer Virology, Vol. 4, No. 3, pp , [9] Jiangang Wang, Xiaohong Li, Xuhui Liu, Xinshu Dong, Junjie Wang, Zhenkai Liang, and Zhiyong Feng. An Empirical Study of Dangerous Behaviors in Firefox Extensions. In Proceedings of Information Security Conference (ISC), [10] Philippe Beaucamps, Daniel Reynaud. Malicious Firefox Extensions. In Proceedings of Symposium sur la scurit des technologies de l information et des communications (SSTIC),

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