From e9e054c5eceb78fe94c86da5a17ed7bbe1621d09 Mon Sep 17 00:00:00 2001
From: Thom Espach <tespach@duckduckgo.com>
Date: Wed, 13 Nov 2024 17:20:03 +0000
Subject: [PATCH] Add Malware Download Test Page (#242)

* Add malware download test

* estlint --fix
---
 security/badware/index.html            |  1 +
 security/badware/malware-download.html | 31 ++++++++++++++++++++++++++
 security/badware/server/routes.js      | 16 +++++++++++++
 3 files changed, 48 insertions(+)
 create mode 100644 security/badware/malware-download.html
diff --git a/security/badware/index.html b/security/badware/index.html
index 4bb7ac0..f14763f 100644
--- a/security/badware/index.html
+++ b/security/badware/index.html
@@ -12,6 +12,7 @@ <h1>Phishing Detection Test Pages</h1>
     <ul>
         <li><a href="./phishing.html">Standard Phishing Test</a></li>
         <li><a href="./malware.html">Standard Malware Test</a></li>
+        <li><a href="./malware-download.html">Malware Download Test</a></li>
         <li><a href="./phishing-iframe-loader.html">Phishing iFrame Loader</a></li>
         <li><a href="./phishing-js-redirector-helper.html">Phishing JS Redirector (Direct)</a></li>
         <li><a href="./phishing-js-redirector.html">Phishing JS Redirector (Indirect)</a></li>
diff --git a/security/badware/malware-download.html b/security/badware/malware-download.html
new file mode 100644
index 0000000..1169484
--- /dev/null
+++ b/security/badware/malware-download.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<html>
+
+<head>
+    <meta charset="utf-8">
+    <title>Malware download page</title>
+    <script>
+        // eslint-disable-next-line no-unused-vars
+        function run() {
+            const url = "/security/badware/phishing-redirect/download";
+            const link = document.createElement('a');
+            link.href = url;
+            document.body.appendChild(link);
+            link.click();
+            document.body.removeChild(link);
+        }
+    </script>
+</head>
+
+<body>
+    <p><a href="/security/badware/">[Back]</a></p>
+
+    <h1>Malware download page</h1>
+
+    <p>This is an example malware page that DuckDuckGo clients intend to block. If you arrive here by mistake; there's
+        nothing to worry about, we just use this page to test if our client blocking is working.</p>
+
+    <button id="run" onclick="run()">Download</button>
+</body>
+
+</html>
\ No newline at end of file
diff --git a/security/badware/server/routes.js b/security/badware/server/routes.js
index 450500a..12e3d15 100644
--- a/security/badware/server/routes.js
+++ b/security/badware/server/routes.js
@@ -61,4 +61,20 @@ router.post('/form', (req, res) => {
     res.send('Form submitted');
 });
 
+// Serves an arbitrary executable file to test download detection
+router.get('/download', (req, res) => {
+    // Create a buffer with a minimal valid PE header
+    const fileData = Buffer.alloc(64);
+    // MZ header (magic bytes)
+    const magicBytes = [0x4d, 0x5a];
+    // DOS stub filled with zeros
+    const dosStub = new Uint8Array(58).fill(0);
+    fileData.set(magicBytes, 0);
+    fileData.set(dosStub, 2);
+
+    res.setHeader('Content-Type', 'application/octet-stream');
+    res.setHeader('Content-Disposition', 'attachment; filename="test.exe"');
+    res.send(fileData);
+});
+
 module.exports = router;
