Whistler Stealer is a C# stealer that sends logs to a PHP script that is saved as txt.
Stiller features:
USB Distribution
Receiving data from browsers: Chrome, Edge, FireFox, Brave and FileZilla
Obtaining CD keys from games
Getting data from VPN: OpenVPN, ProtonVPN, NordVPN, Outline
Retrieve system information (IP, country, PC specifications, etc.)
Encoding log files with special lambda methods
Downloading log files is invisible to Fiddler/Wireshark network analyzers
Leaves no traces in the file system when run in memory or USB