This code performs the following steps: ### 1. Purpose: The code queries...

February 3, 2025 at 09:55 PM

import requests

# Your VirusTotal API Key
API_KEY = 'dffe15c560d1d0384f3d104e262f0f5379ea0c03bd3298770aca1f8de4d5b937'  # Replace with your actual API key
VT_URL = 'https://www.virustotal.com/api/v3/files/'

# Function to query VirusTotal API for hash information
def query_virustotal_api(hash_value):
    headers = {
        'x-apikey': API_KEY
    }
    response = requests.get(f"{VT_URL}{hash_value}", headers=headers)
    
    if response.status_code == 200:
        return response.json()
    else:
        return None

# Function to process the input file, query VirusTotal, and output MD5 hash
def process_hash(input_file, output_file):
    try:
        # Read the hash from the input txt file
        with open(input_file, 'r') as infile:
            hash_value = infile.read().strip()

        # Query VirusTotal API to get hash details
        result = query_virustotal_api(hash_value)

        if result:
            # Check if MD5 is available in the response
            data = result.get('data', {})
            md5_hash = data.get('attributes', {}).get('md5', None)

            if md5_hash:
                # Write the MD5 hash to the output file
                with open(output_file, 'w') as outfile:
                    outfile.write(md5_hash)
                print(f"MD5 hash: {md5_hash} has been written to {output_file}")
            else:
                print(f"MD5 hash not found for the provided hash.")
        else:
            print("No data found for the provided hash in VirusTotal.")

    except FileNotFoundError:
        print(f"Error: The file {input_file} does not exist.")
    except Exception as e:
        print(f"An error occurred: {e}")

# Main function to invoke the script
if __name__ == "__main__":
    input_file = "input_hash.txt"  # Path to the input file containing the hash
    output_file = "output_md5_hash.txt"  # Path to the output file to store the MD5 hash

    process_hash(input_file, output_file)

This code performs the following steps:

1. Purpose:

The code queries the VirusTotal API to retrieve information about a file hash (SHA256, MD5, etc.), processes the API response, extracts the MD5 hash (if available), and writes it to an output file.

2. How It Works:

Input:
- Reads a hash value (presumably a file hash, e.g., SHA256) from an input file (input_hash.txt).
- The input hash must be stored as plain text in the input file.
API Query:
- It makes a GET request to VirusTotal's API (https://www.virustotal.com/api/v3/files/<hash>), passing the x-apikey authorization header to authenticate with the API.
- The API key (API_KEY) is defined in the script and is required by VirusTotal to access its services.
Response Processing:
- If the request is successful (HTTP status code 200), the code parses the response JSON to access the details of the hash.
- Specifically, it tries to extract the MD5 hash value from the attributes section of the response under the key md5.
Output:
- If the MD5 hash is found in the response:
  - Writes the MD5 hash to an output file (output_md5_hash.txt).
  - Prints a success message to the console.
- If the MD5 hash is not found or the request fails:
  - Logs an error message to the console.
- If the input file does not exist or an unexpected issue occurs:
  - Catches and reports errors accordingly.

3. Functions:

query_virustotal_api(hash_value):
- Accepts a file hash (hash_value) as input, queries the VirusTotal API, and returns the JSON response containing hash details if successful.
- Returns None if the query fails.
process_hash(input_file, output_file):
- Handles the main program logic:
  - Reads a hash value from input_file.
  - Queries the VirusTotal API to retrieve information about this hash.
  - Extracts the MD5 hash from the API response (if available).
  - Writes the resulting MD5 hash to output_file.

4. Execution (`if name == "main"`):

Defines file paths:
- input_hash.txt: Input file that contains the hash you want to query.
- output_md5_hash.txt: Output file where the resulting MD5 hash will be stored.
Calls process_hash to execute the workflow described above.

5. Dependencies and Requirements:

The script requires the requests library for making HTTP requests. Make sure it's installed (pip install requests).
A valid VirusTotal API key is required to access the API. Replace the placeholder API_KEY with your actual VirusTotal key.

6. Limitations:

The script processes only one hash at a time because it reads a single line from the input file.
If the VirusTotal query limit for the API key is exceeded, the API may reject queries.
The script assumes the VirusTotal API response has a specific structure, and unexpected changes in the API or malformed responses may cause errors.

7. Example Use Case:

Say you have a file hash (e.g., 44d88612fea8a8f36de82e1278abb02f) saved in input_hash.txt, and you want to find its corresponding MD5 hash via VirusTotal. When you run this script:

It will query VirusTotal with the hash provided.
If successful, it will fetch the MD5 hash and save it to output_md5_hash.txt.

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This code performs the following steps: ### 1. **Purpose**: The code queries...