The Future of Threat Defense Resides at the IP Layer

For years, network security operated on a relatively predictable premise: inspect traffic, identify malicious content, and block it. Because deep content inspection created a seemingly robust defense in depth, relatively static legacy approaches—like reliance on threat intelligence feeds—were allowed to simply persist in the background.

The weaponization of agentic AI and highly evasive techniques has fundamentally shattered that model. Attackers are no longer just iterating on old threats. They are launching attacks at staggering velocity, completely outpacing threat feeds, and employing evasion tactics that actively starve legacy prevention solutions of the content they rely on to inspect.

Our new research report from Unit 42, Attackers Are Evading Threat Prevention at the Internet Edge, reveals how adversaries are actively exploiting the contextual vacuum at the IP layer to bypass standard security controls. For security leaders, understanding this shift is no longer optional. As the nature of the threat fundamentally changes, our strategic approach to network security must definitively change with it.

The AI-Accelerated, Evasive Attack Lifecycle

To understand why legacy defenses are failing, we must look at how adversaries are accelerating and obfuscating every stage of the attack lifecycle. As these threats progress, the commonly used network indicators we have long relied upon are vanishing, collapsing traditional defenses and leaving defenders with little to act on.

Powered by frontier AI, adversaries now automate reconnaissance and exploitation at huge scale and speed, while using anonymizers to mask their intent. Once an intrusion is launched, orchestration shifts to highly evasive command and control (C2). Attackers hide communications using advanced encryption and AI-built malware-less techniques. They’re also bypassing traditional web and DNS inspection entirely by routing traffic directly to IP addresses—a tactic Unit 42 found in 23% of modern malware

Ultimately, the takeaway is clear: network threat prevention can no longer rely solely on detecting malicious payloads. As AI-driven attacks continue to minimize their footprint, security strategies must augment content inspection with real-time IP layer monitoring to left-shift threat detection and counter these rapid, machine-speed threats at the network foundation.

Existing Approaches Aren’t Working

Where content-based detection falls short, many security vendors and organizations still rely on IP threat intelligence feeds to pick up the slack in an attempt to filter out malicious connections on the network layer. However, after years of operating under this model, the results are in—the traditional feed is showing its age.

Attackers have long relied on proxies, anonymizers, residential routers and public cloud providers as a tactic to evade detection. However, agentic AI morphs this process, enabling rapid infrastructure rotation and stealth at an unprecedented scale. As this autonomous evasion accelerates, experienced network defenders continue to run into the well-known limitations of classic IP blocklists:

• Too slow to keep pace: Unit 42 found an average 20-day lag time before new threats hit popular feeds. Because agentic AI enables adversaries to autonomously rotate proxy IPs in hours, these lists are obsolete at the moment of delivery.
• Fundamentally incomplete: IP feeds are unable to see a massive portion of the modern attack surface. Unit 42 research indicates that 52% of malicious IPs used for direct-to-IP connections are completely absent from these lists.
• Unactionable on shared infrastructure: Even known threats are often impossible to block. The Unit 42 team reports that 37% of direct-to-IP traffic uses reputable CDNs and cloud providers. IP feeds cannot distinguish malicious connections from legitimate ones, making blocking too risky for business continuity.
• A management nightmare: Among the security teams that Unit 42 polled, 30% indicate resource-intensive vetting and false-positive triage as their top pain point. To avoid breaking legitimate traffic, feeds are frequently relegated to an alert-only mode, defeating the entire purpose of prevention.

If modern and agentic AI-enabled attacks can outrun traditional network payload-based detections, we need a new weapon in the network defender’s arsenal. We can no longer depend on yesterday’s IP feeds to secure such an extremely agile threat environment.

The Blueprint for Modernizing the Internet Edge

To outpace the impact of agentic AI and advanced evasion on network threat prevention, security leaders must redefine their defense strategy and shift-left to track the attacker infrastructure itself—monitoring the exact IP layer locations where adversaries build and control their campaigns. Deep content inspection remains essential, but securing the modern edge requires establishing the context and intent of a connection before a session is established.

To achieve this goal, organizations must move beyond the limitations of static defense and adopt a modern security blueprint:

• Proactive protection against attacker infrastructure: While high-quality threat feeds remain essential for SOC investigations and incident response, relying on them for frontline, real-time prevention creates major blind spots. Instead, security teams must use real-world, global telemetry to proactively identify and block connections to attacker-controlled hosts before requesting a URL or file.
• Zero trust principles applied to the network layer: An IP address without a negative reputation does not equal a safe connection. Continuous verification requires extending zero trust down to the network foundation. It validates the real-time behavior and intent of every single session to ensure attackers cannot hide in the contextual vacuum of the IP layer.  
• Reducing the attack surface with rich contextual attributes: Traditional IP blocking is like a blunt instrument that creates unacceptable false positives and alert fatigue. To modernize the edge, security teams need deep, attribute-based visibility across the entire Internet address space to reduce noise and replace legacy IP feeds entirely.  

By moving away from point-in-time assumptions and embracing real-time, inline protection, security leaders can reclaim the advantage at the network foundation.

To see how these evasion tactics operate in the wild, read the latest Unit 42 report, Attackers Are Evading Threat Prevention at the Internet Edge. You’ll find this report valuable in understanding the systemic gaps in legacy risk models and learning why continuous verification must be our new mandate.

The post How AI and Evasion Demand a Radical Shift in Network Threat Prevention appeared first on Palo Alto Networks Blog.

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From Fragmented Fences to Cohesive Control

The attack surface for today’s enterprises is incredibly heterogeneous and dynamic. Applications and data are in constant motion, spanning public clouds, private data centers and edge locations. Users connect from anywhere.

For security leaders, this environment has led to an explosion in not only operational complexity, but in many cases, uncertainty. ​​Together, Nutanix and Palo Alto Networks enable security to finally match the speed and scale of these dynamic hybrid cloud environments.

The security ecosystem has become vast and complex. Point solutions accumulate to address specific gaps, yet each adds another interface, another policy language and another integration to manage. However well intentioned, this sprawl can lead directly to fractured visibility, overlapping tools and operational fatigue.

Elevate Perimeter Protection to Defense-in-Depth

Enterprises today face unprecedented security complexity as hybrid and multicloud environments become the new normal. Currently, 94% of enterprises use some form of cloud service, while 89% report having a multicloud strategy in place. This distributed reality means security is paramount: while managing cloud spending is the number one operational challenge (82% overall), security remains a major concern, affecting 79% of all organizations.

Hybrid cloud adoption offers agility, but it also introduces distinct security challenges that strain traditional approaches. Adversaries have taken notice. Hybrid and multicloud environments are prime targets because they connect sensitive data, privileged accounts and critical systems across public, and on-premises infrastructure. Perimeter-based security models, built for static networks and centralized data centers, cannot keep pace in a world where apps and data continuously move between platforms.

Defense-in-depth has become essential for addressing the inherent dynamism of today’s environments. Network visibility is required to monitor and contain east-west traffic and lateral movement of threats inside cloud environments. Identity controls must verify every user, device and interaction across a distributed workforce. Data protection must follow sensitive information as it traverses multiple clouds, data centers and edge locations.

Yet managing these protections as distinct layers is no longer viable. Each cloud provider introduces its own native security controls. Each additional tool adds another interface and another policy set to maintain. Defense-in-depth only achieves its purpose when its layers are fully unified, providing consistent control enforcement from the edge to the core, comprehensive visibility across traffic, and essential data protections for all workloads, wherever they reside.

Freedom of Choice Without Fragmentation

Hybrid environments span public clouds, private infrastructure, SaaS ecosystems and legacy on-premises systems. No single vendor can realistically cover that entire landscape, and forcing security into a single closed ecosystem risks creating gaps where those environments meet.

The answer lies in an open ecosystem approach that allows organizations to assemble best-of-breed capabilities rather than being locked into a single provider’s stack.

This flexibility empowers security teams to adapt to the unique requirements of each environment while still operating through a unified security model. Policies can be applied consistently, intelligence can be shared across layers, and protections can move in step with workloads, regardless of platform. In short, this model can effectively support freedom of choice while relieving the operational burden of managing hybrid and multicloud security.

A Unified Security Layer Across Every Environment

Open ecosystems solve the problem of choice. What remains is the challenge of bringing those best-of-breed capabilities together into a solution that is coherent and scalable.

To transform defense-in-depth from a conceptual framework into a practical system aligned to the realities of hybrid and multicloud deployments, this unified layer should be built on core capabilities:

• Inline visibility for east-west traffic within virtualized and cloud environments, enabled by deploying next-generation firewalls directly inside virtual private networks:
  This approach inspects workload-to-workload traffic, identifies anomalous behavior and stops lateral movement before it spreads.
• Consistent policy enforcement across public cloud, private data centers and edge locations through a centralized management plane:
  A single set of policies should be authored once and pushed everywhere, assuring a consistent security posture across all clouds and environments.
• Abstraction of security intent from network coordinates through tag-driven automation, an approach that allows security policies to be expressed in terms of workload attributes (rather than IPs or locations):
  These protections follow workloads automatically as they move. Through integration with orchestration pipelines, this approach aligns controls with rapid application rollouts in CI/CD workflows, all without manual reconfiguration.

With these core capabilities, security can finally catch up to the fluidity promised by hybrid cloud operating models.

Explore how Palo Alto Networks and Nutanix, work together to make this unified vision a reality, including joint offerings, like Palo Alto Networks secured Nutanix clusters with VM-Series Firewalls for AWS^® and Microsoft^® Azure.

The post Untangling Hybrid Cloud Security appeared first on Palo Alto Networks Blog.