Malwarebytes was among the first to detect the malware, which we identify as Trojan.Agent.TRK. If you’ve been affected, take steps to clean your computer immediately. The affected mods were identified as No-Clip and Angry Planes. The malware has a black dove logo and has been identified as fade.exe or Trekker.EX The malware was identified as a.NET 4 assembly using Exeinfo PE and SmartAssembly. It has also been obfuscated using SmartAssembly, which was removed using the powerful de4dot de-obfuscator.”]
Source: https://blog.malwarebytes.com/cybercrime/2015/05/beware-of-gta-5-mods-containing-malware/