How Sogou Browser Rewrites Search Affiliate Codes

Xusheng Li，About I am a software developer at Vector 35 Inc., where I am one of the core developers of Binary Ninja and lead the development of its debugger, including its Time-Travel Debugging (TTD) integration. My research interests span reverse engineering, ma...关注

I recently poked at Sogou Browser (version 13.9.6121.400) out of curiosity and found that it rewrites hundreds of affiliate codes in Baidu or Sogou search URLs. Specifically, there is a list of search affiliate codes hardcoded in the binary, and when one is seen, it is replaced. The search engine only ever sees the substituted code — the original never reaches it.

Affiliate codes, briefly

If you have looked closely at a Baidu search URL you have seen something like this:

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