Stop the Brute-Force Madness: Embrace Isolation with AppGuard

On September 2, 2025, The Hacker News reported a startling rise in brute-force and password-spraying attacks targeting SSL VPN and RDP devices. These assaults, orchestrated via the Ukrainian network FDN3 (AS211736) between June and July of this year, represent a dramatic shift in attackers' methods—one that demands a new defense mindset. The Hacker News

Researchers from French cybersecurity firm Intrinsec traced these campaigns back to FDN3, a network deeply tied to other abusive infrastructures—Ukrainian and Seychelles-based autonomous systems that routinely shift IPv4 prefixes to evade blocklisting.

These brute-force campaigns peaked between July 6 and 8, 2025, targeting VPN and RDP access points and mimicking tactics favored by ransomware-as-a-service groups like Black Basta, GLOBAL GROUP, and RansomHub to breach protective perimeters.

Why “Detect and Respond” Isn’t Enough

Traditional cybersecurity relies on detecting threats then responding—typically deploying patching, investigations, or containment after an incident's beginning. But when brute-force attacks rapidly infiltrate SSL VPNs or RDP endpoints, every second counts.

Let’s be real: even best-in-class detection tools can lag behind stealthy, persistent attackers. Once credentials are sprayed or breached, networks already face the threat of lateral movement, ransomware deployment, or exfiltration.

Enter Isolation and Containment: The AppGuard Advantage

This is where AppGuard makes the difference.

AppGuard—trusted for over a decade—takes a fundamentally different approach: instead of waiting to detect, it isolates and contains threats in real time.

Zero-trust enforcement: Even if a server or endpoint is compromised, AppGuard prevents unauthorized code execution and lateral movement.
Minimal disruption: Rather than blanket network shutdowns or response delays, AppGuard’s micro-containment strategy keeps business operations running.
Ten years of proven success: Now available for commercial use, AppGuard offers enterprise-grade protection adapted for modern threats.

By implementing isolation at the endpoint, AppGuard ensures that brute-force intrusion attempts—even those originating from evasive, bulletproof hosting networks—stay confined and neutralized.

A Clear Path Forward for Business Owners

Stop reacting—start isolating. Move away from just detecting breaches post-factum.
Adopt AppGuard. A mature, reliable solution with a decade-long track record.
Protect your VPN and RDP assets. Especially from rapidly evolving brute-force and password-spraying campaigns.

Stop playing the crazy game. Come over to the AppGuard way of doing things.

As business leaders, the time has come to shift from reactive “detect and respond” cycles to proactive “isolate and contain” strategies. AppGuard empowers you to do exactly that.

Call to Action:
Business owners—let’s talk. Reach out to us at CHIPS to learn how AppGuard can safeguard your critical endpoints from brute-force attacks like those launched by FDN3. Let’s move your defense strategy from detection to real-time isolation and containment—before it’s too late.

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