A sample spyware written in VB.NET

To Build it for your own testing, follow these steps

• Clone Solution
• Edit Config.vb file according to your requirements
• Set .Net Framework for specific target
• Build Solution
• Use ConfuserEx CLI with TinyKLX.crproj to obfuscate your app
• Finally your app will be ready to use

This malware uses classic malware techniques to persist.

• It is built against .Net making machine code much complex.
• Since it is confused with ConfuserEx, hiding flow and data, making it almost undetectable. But still it follows a specific pattern which can be detected as follow:
• When it is launched, it shows fake messege Config.UserErrorMessage in foreground and re-starts itself with Config.SafeCommand
• As soon as it is launched with Config.SafeCommand, it checks its execution location. If it is not a temp path then it copies itself to temp path and starts from temp path with safe command
• If successfully previous two steps are performed then it sets itself to be started again when computer restarted from "RunOnce" key with name Config.AppName
• Since RunOnce Keys are removed everytime app is started. It sets again and again.
• When persistance is verified, it starts logging
• Every key is captured, and screenshot is captured when user presses enter key or mouse click (called capture event).
• All this captured events are stored till their number exceed Config.MaxEvents.
• When certain amount of events are captured they are then compiled as HTML file which is GZipped and transmitted to network via Email.
• This loop continues for ever.