They should widen response from one adversary to the service layer that sustains many adversaries. That means blocking abused hosting, tracking proxy and loader dependencies, and tightening identity and access controls so the organisation is harder to monetise even when infrastructure persists elsewhere.
Why shared infrastructure changes the response
When ransomware activity is enabled by shared infrastructure, the response has to shift from a single group problem to a service-layer problem. The same hosting, redirectors, loaders, or proxy services may support multiple crews, so blocking one actor without addressing the shared layer often leaves the intrusion economy intact.
That changes the practical objective: remove or degrade the infrastructure the ecosystem depends on, not just the individual campaign you can currently attribute. CISA cyber threat advisories are a useful reference point for tracking the infrastructure patterns and abuse paths that persist across ransomware activity.
What defenders should target first
The first priority is to identify the shared service components that make monetisation possible, then decide which of them can be blocked, sinkholed, or monitored without creating unnecessary collateral damage. Abuse-resistant response means looking for repeatable dependencies such as hosting ranges, bulletproof infrastructure, proxy networks, loaders, and command paths that recur across incidents.
That work is strongest when it is paired with identity and access control review. If an actor can keep using the same service accounts, tokens, or cloud identities after infrastructure is disrupted, the operational win is temporary. The organisation should harden the identities and privileges that support the abuse path, not only the network locations that host it.
Why this matters for containment and recovery
Shared infrastructure creates cross-incident coupling, so one compromise can expose many campaigns at once. That means the response team should treat infrastructure intelligence as a containment asset: it helps prioritise what to block, what to monitor, and where compromise is likely to recur even after takedown activity.
It also changes recovery planning. If the shared layer is durable, attackers can rotate campaigns faster than defenders can finish attribution. ENISA threat landscape analysis is relevant here because it frames ransomware and supply-chain style dependencies as recurring threat patterns rather than isolated events.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
MITRE ATT&CK and OWASP Non-Human Identity Top 10 address the attack and risk surface, while NIST CSF 2.0 and CIS Controls v8 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| MITRE ATT&CK | T1583 — Acquire Infrastructure | Shared hosting and proxy services are reusable attacker infrastructure. |
| Recommendation — Map recurring hosting and proxy patterns to infrastructure acquisition and block or monitor them. | ||
| NIST CSF 2.0 | DE.CM-01 — Networks and environments are monitored to detect potential cybersecurity events | Shared infrastructure abuse is detected through recurring telemetry and abuse patterns. |
| RS.MA-02 — Incidents are contained to the extent possible | Response must limit the blast radius of shared infrastructure abuse. | |
| Recommendation — Monitor for repeated infrastructure reuse and trigger containment when patterns recur. Contain abused infrastructure and restrict the paths that enable repeated monetisation. | ||
| CIS Controls v8 | CIS-5 — Account Management | Identity and access controls are central when infrastructure persists elsewhere. |
| Recommendation — Review and remove the identities and access paths that enable continued abuse. | ||
| OWASP Non-Human Identity Top 10 | NHI-05 — Overprivileged NHI | Shared abuse is harder to stop when non-human identities retain excess privilege. |
| Recommendation — Reduce non-human privilege so reused infrastructure cannot keep operating effectively. | ||
Practitioner Guidance
What to prioritise: Focus on the smallest shared service set that sustains the highest volume of abuse. If a hosting provider, proxy network, or loader family appears across incidents, treat that as a response queue ahead of campaign-by-campaign attribution.
What to verify: Confirm whether the infrastructure still supports active delivery, persistence, or monetisation before investing effort in full actor attribution. If the same access paths remain usable, the immediate risk is continued reuse, not just historical linkage.
What good looks like: The team can show that abused infrastructure is being disrupted, the dependency chain is mapped, and identity or access paths behind the abuse are being revoked or constrained. A response that only names the group but leaves the service layer untouched is usually incomplete.
Practitioner takeaway: The most effective response is to break the reusable service layer and the access that sustains it, because that is what reduces the attacker’s ability to re-monetise at scale.
Related resources from NHI Mgmt Group
- How should security teams respond when sanctions target ransomware infrastructure providers and cybercriminal enablers rather than only the operators themselves?
- What should security teams do when a ransomware group shifts from one industry to another?
- How should security teams respond when a ransomware group’s internal systems are breached but its decryptors are still unavailable?
- How should security teams respond when a ransomware group claims a breach but the evidence does not materialise?