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Hao123 has been accused of being a malicious browser hijacker, as it often installs itself without user's consent after being installed by another application, and once installed it is difficult to remove. Hao123 has been accused of using Windows service, registry and browser parameters to modify the browser's default setting and prevent being removed or uninstalled by adding itself back through Windows service. It also sniffs user's internet traffic illegally and forces users to visit its website to improve its website traffic ranking. For this reason, Hao123 is considered as malware by many anti-virus programs.
Since September 2011, foreign language versions such as Thai have been launched. However, because Baidu antivirus software will force hao123 to be the IE homepage, it was boycotted by Thai netizens.
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