Malicious proxies: when hackers spy on you without you knowing

Browsing the Internet can sometimes feel safe, especially when you use secure connections, complex passwords, or a VPN. And yet, a more discreet but equally dangerous threat hides behind certain seemingly harmless services: malicious proxies.

These tools, technical at first glance, are used in increasingly common attacks that can hijack your data, bypass protections, and even monitor you in real time. Let's break it down.

What exactly is a proxy?

A proxy is a server that acts as an intermediary between your device and the Internet. Rather than connecting directly to a website, your request first passes through this proxy server.

This mechanism has several legitimate uses: improving security, filtering content, or preserving anonymity. That's what a VPN does, for example.

But in the wrong hands, a proxy becomes a formidable hacking weapon.

The malicious proxy: an invisible spy

A malicious proxy works just like a regular proxy... with one difference: it records, modifies, or hijacks your data.

Here are some common uses by cybercriminals:

• Intercepting your credentials when you log in to online services (email, social networks, bank accounts).

• Bypassing two-factor authentication (2FA) by acting in real time between you and the real site.

• Injecting content (ads, malicious scripts, booby-trapped links) into web pages.

• Analyzing your browsing habits to then carry out targeted attacks (phishing, social engineering, etc.).

This type of attack is very hard to detect, because everything looks normal from the user's point of view. Pages load, credentials are accepted, connections appear valid. Yet someone is watching, recording... and acting behind the scenes.

How does a user end up trapped?

Usually, the user doesn't even know they're using a malicious proxy. Here's how attackers operate:

• Through a fake link (in an email, a text message, or on a website) that redirects to an exact copy of a legitimate site, but hosted on a proxy.

• Through a pirated application or browser plugin that changes your network settings without you noticing.

• Through a fake VPN service or free proxy that intercepts all traffic in the background.

Concrete examples of proxy attacks

• A user logs in to their bank account through a fake site hosted on a proxy. Their credentials are intercepted, along with their SMS validation code. The result: the account is drained within minutes.

• An employee opens a link received by email. The page looks like their company portal, but it's controlled by a malicious proxy. The cybercriminals gain access to the company's internal network.

• A student uses a free VPN to get around restrictions. In reality, they're unwittingly handing over their passwords and searches to servers controlled by hackers.

How can you protect yourself?

Fortunately, there are simple yet effective habits to avoid falling into the trap:

1. Don't trust unknown "free" services

A proxy or VPN that costs nothing... probably costs you your privacy. Prefer well-known, transparent solutions that are recommended by professionals.

2. Watch URLs and HTTPS certificates

A malicious proxy can alter the address or display an insecure certificate. Pay attention to your browser's address bar.

3. Check the server's location

Some applications or browser extensions let you view the IP address and geographic location of the server you're connected to. If you're based in France and your traffic suddenly routes through a server in Russia or Panama for no reason, ask yourself some questions.

4. Install a complete antivirus and anti-malware solution

Some tools are able to detect the abnormal use of proxies or invisible scripts injected through a proxy.

5. Train yourself (and your teams) in cybersecurity

Understanding how these attacks work often makes it possible to spot them before it's too late.

Why this is also GottaPhish's field of action

At GottaPhish, we take a close interest in these new forms of attack based on social engineering and technical manipulation.

Our educational tools make it possible to reproduce real-world scenarios, including attacks via malicious proxies, in order to train and raise awareness among employees. Because within a company, a single person clicking on the wrong link can be enough to open a breach.

Through targeted simulations and behavioral analysis, GottaPhish helps organizations strengthen their first line of defense: the users themselves.

In summary

A malicious proxy is not a visible threat. It's a silent, clever, and dangerous tool that exploits trust and a lack of understanding of how the web works.

Better safe than sorry: by training yourself, using reliable tools, and avoiding risky shortcuts, you dramatically reduce the chances of falling into the trap.

And if you'd like to go further with awareness or prevention, GottaPhish is here to support you.