CatNet

On the surface, CatNet ("KoshekSeet" in Russian, as written on the program's logos and branding) is a minor social media application catering to the Slavic-speaking communities within the United States. Similar to a "Slavic Facebook", it allows users to create profiles, connect with friends, form groups, and of course send messages between these profiles and groups. All this created and at least slightly overseen by a young woman identified only by her web handle "Narkotik".

The truth, however, is far from being so innocent. Those who install a "CatChip" in their phone can access the true nature of CatNet: by connecting to a special DarkWeb server, the CatChip allows secret profiles and groups to be accessed, which in turn gives the user ability to communicate with a network not visible to the public.

To fit with the name, CatNet's notification sound is that of a cat mewing - a sound so notably realistic and of such connotation it is infamous for attracting the attention of any felines in the area when it goes off.

Darknet
The 'dark side' of CatNet was created for use in crime, specifically for Bratva Oktyabrya, but it has also been given to her allies for easy communication between the various criminal groups. In the three years since it appeared on the app store, CatNet has become the primary method of communication and networking for Bratva Oktyabrya and those involved with her - and even though there is speculation, the New York City Police Department is nowhere near cracking into the network to find anything concrete out.

Login System
CatNet uses a fingerprint-based login system, which, if the wrong fingerprint is put in on a CatChip-activated device, will log in to 'public-level' CatNet, adding a useful level of security from prying eyes. Furthermore, the fact that most (if not almost all) of CatNet's userbase are civilians unaware of the true purpose adds a perfect cover to those with CatChips in their phones, in the form of an unknowing and unwitting addition to the disguise.

Cover
CatNet's supposed legitimate reason for use among the Slavic-speaking communities is its built-in support of Cyrillic characters and native spelling/grammar correction in several Slavic languages. Furthermore, devices with the CatChip can give other CatChip-enabled devices permission to 'brick' their phones - that is, to fry their hard drives beyond even the NYPD's technical recovery abilities. Bricking also happens automatically, should anyone attempt to tamper with a CatChip.