We will send a demo of cheating player to Valve/VAC

The VAC system reliably detects cheats using their cheat signatures. Any third-party modifications to a game designed to give one player an advantage over another is classified as a cheat or hack and will trigger a VAC ban. This includes modifications to a game's core executable files and dynamic link libraries.

Using chat programs like X-Fire or Overwolf
System hardware configurations
Updated system drivers, such as video card drivers

If you know of a new cheat, especially private cheats (ones that aren't on a public website), and can provide the links or the actual binaries, please visit the SteamPowered Forums and send a private message to the VAC Team to ensure the information is received by the VAC development team.

Send the VAC Team a Private Message