最近发现,手机上网经常弹出广告, 如下图所示

image.png

于是开始对其进行追踪. 追踪过程如下:

最终的广告页在是这个

image.png

可以看到这个dog-1907008_a_15.html 又是通过的 floating-frame.js加载进来的.

image.png

floating-frame.js 来源于华数,我家用的华数宽带.
http://218.108.240.18/static/FloatingContent/F0y7RdnhqmcHSfx8AqX9uQ/floating-frame.js

我们找到了最终元凶: 华数
ICP反查, 可以看到IP是华数所拥有的.

image.png

处理方式

把IP 218.108.240.18 在路由器上拉黑就好了.
或者去工信部投诉?

原理

关于运营商广告劫持是一个老话题了. http协议是一个非安全协议, 可以看到所有被插入广告的, 一定不是Https的网页.
第一: http协议通信内容在网上全部为明文. 存在被窃听风险
第二: http协议由于无安全保证, 可以任意篡改其网页内容.
第三: http 存在DNS被劫持的可能. 我们此例攻击就发生了DNS劫持.
如下图:

image.png

这个IP又是华数的

image.png

送上一句:垃圾华数,攻击手段太低级

华数的这个广告页js是混淆的, 我放在这里, 大家兴趣可以分析一下

http://218.108.240.18/static/FloatingContent/F0y7RdnhqmcHSfx8AqX9uQ/floating-frame.js

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