2024 Writeups

Author: harshaldulera

Bonus/Blueprint/README.md

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+�p��Bg��RL���

Bonus/Blueprint/files/ctf.apk

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+-----BEGIN PRIVATE KEY-----
+MIIBVAIBADANBgkqhkiG9w0BAQEFAASCAT4wggE6AgEAAkEA6//otXnU0o0ULKpV
+PBAsH+WJ37ui56v9pmdUCAbWl5GVOtNZUVsLA+KM3mMjHDvG1DzZZo4uce6sL7wd
+Upl6cQIDAQABAkB8Rkt13Q0MPwxjpOKzeVSzCz26WmWjl7c/fGQMwgUY1KcFM5CN
+xk4qIGZPQsPYyWBBjgP31VpnkF+a/aWOnQeRAiEA/P/4oiFgS6CQpoxis3oqze71
+uyddtocKJo3+R0PlRPUCIQDuzFSSVw7jQgJebxJuYBbxgB4X2KYjH7W+SYaVWVTS
+DQIhAJpxjA81PrqMFyGEm5AiqNSz5lBMlLmjMAAfODW67c+tAiBH//O/69/hRZXR
+Q0wbW32Pc0GfjwMItBboOOMLRNP+QQIgaanJ2Oa3ji1OgaC/KUbxbTWRf/RGbDO5
+FHl+bI070Vk=
+-----END PRIVATE KEY-----

Bonus/Blueprint/imgs/decompile.png

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+import wave
+
+def extract_and_save_data(input_wav_file, output_file):
+    cover_wav = wave.open(input_wav_file, mode='rb')
+    
+    frames = bytearray(cover_wav.readframes(cover_wav.getnframes()))
+    
+    data_ex = []
+    value = 0
+
+    j = 0
+    for i in range(0, len(frames), 2):
+        data_bit = frames[i] & 1
+        value |= data_bit << j % 8
+        j += 1
+        if j % 8 == 0:
+            data_ex.append(value)
+            value = 0
+
+    extracted_data = ''.join([chr(byte) for byte in data_ex])
+    
+    with open(output_file, 'wb') as file:
+        file.write(extracted_data.encode('utf-8'))
+
+    print("Extracted data saved to", output_file)
+
+input_wav_file = "Strange.wav"
+output_file = "extracted_data.txt"
+extract_and_save_data(input_wav_file, output_file)

Bonus/Blueprint/imgs/flag.png

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+const https = require('https');
+
+const firebaseConfig = {
+    projectId: "existinguisher",
+};
+
+const fetchDocuments = () => {
+  const url = `https://firestore.googleapis.com/v1/projects/${firebaseConfig.projectId}/databases/(default)/documents/existinguisher`;
+
+  https.get(url, response => {
+    let data = '';
+
+    response.on('data', chunk => {
+      data += chunk;
+    });
+
+    response.on('end', () => {
+      if (response.statusCode === 200) {
+        const jsonData = JSON.parse(data);
+        jsonData.documents.forEach(document => {
+          const docId = document.name.split('/').pop();
+          const docData = document.fields;
+          console.log(`${docId} => ${JSON.stringify(docData, null, 2)}`);
+        });
+      } else {
+        console.error(`Failed to fetch documents. Status code: ${response.statusCode}`);
+      }
+    });
+  }).on('error', error => {
+    console.error('Error:', error);
+  });
+};
+
+fetchDocuments();