Tini is a simple and very small (3kb) backdoor for Windows, coded in assembler. It listens at TCP port 7777 and gives anybody who connects a remote Command Prompt.
Download the file, rename it from .dat to .exe, and run it. Connect (with an ordinary telnet client or similar) to TCP port 7777 and press Enter once, now you'll see the Command Prompt and be able to type commands.
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