Jingwang Weishi

'Clean Net Guardian') is a content-control mobile app developed by Shanghai Landasoft Data Technology Inc.[1] It is known for its use by the police in Xinjiang, China.

The server responds with a JSON object containing a list of MD5 hashes, which the program stores in a local SQLite database.

[1] The application records the "essential information", as the program's code calls it, of its device.

It looks for files with the extensions 3GP, AMR, AVI, WEBM, FLV, IVX, M4A, MP3, MP4, MPG, RMVB, RAM, WMA, WMV, TXT, HTML, CHM, PNG, and JPG.

[3][4] If the user taps on the bottom-right button, a screenshot of the list is saved in the device's image gallery, in the format yyyy-MM-dd_HH-mm-ss.jpg.

[1] The application updates itself by downloading newer APKs (Android app files) from another server.

[1] The application also makes periodic requests to the base server to update its local database of MD5 hashes of "dangerous" files.

[1] Police in China have reportedly forced Uyghurs in Xinjiang to download the application as part of a mass surveillance campaign on the eve of the 19th National Congress of the Chinese Communist Party.