![]() Upon startup, the malicious library creates a mutex with the name Global\TBrowser that prevents two instances of the malware from running at the same time. To ensure Tor functions correctly, this malicious library proxies all its exports to freebl.dll (a copy of the original freebl3.dll library).įorwarded exports of the malicious freebl3.dll library ![]() In the case of the infected browser installation, the adversaries replaced this library with a malicious one. When Tor Browser (either the legitimate or the infected one) starts up, it loads the freebl3.dll library into the address space of a firefox.exe process. #Tor browser mac download windows#PE32 executable (DLL) (GUI) x86-64, for MS Windows Snippets of the modified (left) and original (right) 000-tor-browser.js file The freebl3.dll library MD5ģBA945FD2C123FEC74EFDEA042DDAB4EB697677C600F83C87E07F895FB1B55E2
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