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	<title>DDoS &#8211; richliu&#039;s blog</title>
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		<title>手機廣告網路被用來發動 DDoS 攻擊</title>
		<link>https://richliu.com/2015/10/01/1872/%e6%89%8b%e6%a9%9f%e5%bb%a3%e5%91%8a%e7%b6%b2%e8%b7%af%e8%a2%ab%e7%94%a8%e4%be%86%e7%99%bc%e5%8b%95-ddos-%e6%94%bb%e6%93%8a/</link>
					<comments>https://richliu.com/2015/10/01/1872/%e6%89%8b%e6%a9%9f%e5%bb%a3%e5%91%8a%e7%b6%b2%e8%b7%af%e8%a2%ab%e7%94%a8%e4%be%86%e7%99%bc%e5%8b%95-ddos-%e6%94%bb%e6%93%8a/#respond</comments>
		
		<dc:creator><![CDATA[richliu]]></dc:creator>
		<pubDate>Wed, 30 Sep 2015 17:18:06 +0000</pubDate>
				<category><![CDATA[Security]]></category>
		<category><![CDATA[Cloudfare]]></category>
		<category><![CDATA[DDoS]]></category>
		<category><![CDATA[Mobile]]></category>
		<category><![CDATA[網路安全]]></category>
		<guid isPermaLink="false">https://richliu.com/?p=1872</guid>

					<description><![CDATA[<p>這篇文章的起因是因為 CloudFare 發佈了一篇報告, Mobile Ad Networks as DDo [&#8230;]</p>
<p>The post <a rel="nofollow" href="https://richliu.com/2015/10/01/1872/%e6%89%8b%e6%a9%9f%e5%bb%a3%e5%91%8a%e7%b6%b2%e8%b7%af%e8%a2%ab%e7%94%a8%e4%be%86%e7%99%bc%e5%8b%95-ddos-%e6%94%bb%e6%93%8a/">手機廣告網路被用來發動 DDoS 攻擊</a> appeared first on <a rel="nofollow" href="https://richliu.com">richliu&#039;s blog</a>.</p>
]]></description>
										<content:encoded><![CDATA[<p>這篇文章的起因是因為 CloudFare 發佈了一篇報告,<br />
<a href="https://blog.cloudflare.com/mobile-ad-networks-as-ddos-vectors/" target="_blank" rel="noopener">Mobile Ad Networks as DDoS Vectors: A Case Study</a> (中文的可以看 <a href="http://www.ithome.com.tw/news/99013" target="_blank" rel="noopener">史無前例！46萬支中國手機發動DDoS洪水攻擊</a>)</p>
<p>這種文章通常加了中國之後腦袋就壞掉了, 我是看到中文標題才跑回去找原文來看的, 果然原文才有有趣的資料<br />
<span id="more-1872"></span></p>
<p>有幾個有趣的點, 我標一下,<br />
The flood was coming from a single country: 99.8% China<br />
攻擊 99.8% 來自中國 </p>
<p>During the flood we were able to look at the packet traces and we are confident the attack didn&#8217;t involve a TCP packet injection.<br />
確認這次的攻擊不包含 TCP packet injection (就是修改 TCP packet 或是在 TCP packet 內加料)</p>
<p>To recap, we think this had happened:</p>
<ul>
<li>A user was casually browsing the Internet or opened an app on the smartphone.</li>
<li>The user was served an iframe with an advertisement.</li>
<li>The advertisement content was requested from an ad network.</li>
<li>The ad network forwarded the request to the third-party that won the ad auction.</li>
<li><strong>Either the third-party website was the &#8220;attack page&#8221;, or it forwarded the user to an &#8220;attack page&#8221;.</strong></li>
<li>The user was served an attack page containing a malicious JavaScript which launched a flood of XHR requests against CloudFlare servers.</li>
</ul>
<p>不是 Third-Party 的網頁中標了, 就是被導到中標的網頁. </p>
<p>其實我看到特別標出不是 TCP Packet Injection 那一段就感覺好像在那邊看過.<br />
找了一下網路, 發現還是找自己的 BLOG 最好 (我都忘了這件事情了)<br />
<a href="https://richliu.com/2015/04/04/1770/" target="_blank">Github 遭受 Baidu JavaScript 的攻擊</a></p>
<p>簡單的說, 我認為不是 third-party website &#8220;attack page&#8221; 有問題, 而是被導到 &#8220;attack page&#8221;<br />
我相信他們己經操作的很純熟了, 只是是在那邊發動攻擊的呢? 這就不得而知了. </p>
<p>如果再搭配前一陣子的新聞, 我相信這群人應該掌握不少 corerouter .<br />
<a href="http://fortune.com/2015/09/15/cisco-routers-hack/" target="_blank" rel="noopener">Cisco routers attacked by hackers in four countries</a></p>
<p>The post <a rel="nofollow" href="https://richliu.com/2015/10/01/1872/%e6%89%8b%e6%a9%9f%e5%bb%a3%e5%91%8a%e7%b6%b2%e8%b7%af%e8%a2%ab%e7%94%a8%e4%be%86%e7%99%bc%e5%8b%95-ddos-%e6%94%bb%e6%93%8a/">手機廣告網路被用來發動 DDoS 攻擊</a> appeared first on <a rel="nofollow" href="https://richliu.com">richliu&#039;s blog</a>.</p>
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