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MSSPs can make ransomware hunts more useful by looking for attacker activity before encryption, covering both customer environments and the provider’s own management systems, and ensuring that findings can be investigated and acted on. That means collecting the right logs, checking identity and remote-access anomalies, watching for attempts to impair recovery, and agreeing on response roles with customers in advance. Threat hunting can help find a foothold or limit damage; it cannot guarantee that an attack will be prevented or detected.
Why hunt before ransomware becomes obvious?
Encryption is a conspicuous stage of an incident, but it may not be the first. An intruder can establish access and carry out other activity before files are encrypted. Proactive hunting searches for signs of that activity rather than waiting for an alert or visible disruption. CISA and FBI guidance describes threat hunting as a proactive search for threat-actor activity intended to prevent attacks or minimize damage if an attack succeeds.
That purpose is different from simply matching known indicators. An indicator can help identify activity already associated with a threat, but a hunt also examines behavior and context: who accessed a system, how privileges changed, whether a login fits the account’s normal role, and whether an endpoint or recovery system was altered. No single pattern applies to every ransomware incident, so findings need validation rather than automatic attribution.
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A managed provider’s remote management and administrative access can connect its infrastructure to multiple customer environments. CISA’s Joint Cyber Defense Collaborative has warned that exploitation of remote monitoring and management (RMM) platforms can create footholds in MSP servers and, from there, customer networks. That makes the provider’s own RMM servers, remote-access pathways, privileged service accounts, delegated permissions, and customer connections part of the hunt scope—not just the customer endpoints being monitored.
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This creates a cross-customer risk. A suspicious event on a provider system may have implications beyond one tenant, while legitimate maintenance can resemble malicious activity if investigators lack context. Providers should be able to establish which account acted, from what device, within which customer scope, and whether the action matches an approved change or ticket.
What to hunt for
CISA’s interagency #StopRansomware Guide identifies several useful leads. They are investigation starting points, not proof of compromise:
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- Identity and privilege changes: newly created or escalated Active Directory accounts, along with unusual activity by privileged accounts.
- Remote-access anomalies: VPN or other logins that are unusual for the account, source, timing, or expected access pattern.
- Changes that could impair recovery: endpoint activity affecting backups, shadow copies, disk journaling, or boot configurations.
These leads become more actionable when correlated across identity, endpoint, network, and remote-access records. For example, a privileged account change should be checked against its owner, the source device, the time of access, the relevant customer, and any authorized maintenance context. A single unfamiliar login or system change is not enough on its own to establish malicious activity.
A practical hunt workflow for provider and customer environments
The following sequence is an operational synthesis of the cited guidance, not a checklist prescribed verbatim by CISA. Adapt it to the provider’s architecture and customer agreements.
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- Define the scope. Map the provider’s RMM servers and remote-access routes, privileged service accounts, delegated permissions, and customer connections. Include the customer systems and identities relevant to the suspected activity.
- Check telemetry before calling the hunt complete. Confirm access to identity and directory events, VPN and remote-access logs, endpoint events, network-defense signals, RMM administration logs, and backup or recovery-system events where available. Record gaps: an event source that was not collected cannot support a confident conclusion.
- Investigate the core leads. Review account creation and privilege escalation, suspicious privileged-account use, unusual remote logins, and endpoint changes that could affect backup or boot recovery. Look for related activity across systems, not just an isolated alert.
- Build and validate a timeline. Compare events across provider and customer environments. Check approved change windows, ticket context, account ownership, source device, and customer scope to distinguish authorized administration from unexplained access.
- Escalate credible findings under the response plan. Preserve relevant evidence, coordinate containment with the customer, and check for persistence or activity affecting additional tenants before declaring an environment clean. Follow agreed authority and communication paths rather than improvising them during an incident.
- Refresh the hunt hypothesis. Review current advisories and indicators before operational use. CISA’s Play ransomware advisory was updated on June 4, 2025 with additional tactics, techniques, procedures (TTPs), and indicators of compromise (IOCs). That update illustrates why actor-specific material should be treated as time-sensitive, not as a permanent detection list.
Make the hunt actionable with logging, access controls, and preparation
A joint advisory released May 11, 2022 by CISA and partner agencies in the United States, United Kingdom, Australia, Canada, and New Zealand recommends monitoring and logging, endpoint detection and network-defense monitoring, and retaining the most important logs for at least six months. Six months is a recommendation in that advisory, not a universal statutory retention period. Organizations should also check applicable local requirements and their own operational needs.
The same advisory recommends securing remote-access applications and using multifactor authentication (MFA) where possible. CISA’s ransomware guide also advises least privilege and limiting third-party access to systems within the third party’s role. For an MSSP, these recommendations can be reflected in access design and customer agreements: define which systems provider personnel may reach, which accounts they may use, and who can authorize or revoke access.
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Preparation matters as much as detection. The advisory recommends developing and exercising incident-response and recovery plans with defined stakeholder roles. Plans should make clear who can authorize containment, how the provider and customer coordinate, how evidence is preserved, and who leads recovery. The advisory also recommends managing supply-chain risk across security, legal, and procurement functions.
Questions to ask when evaluating an MSSP’s hunt capability
Official guidance does not provide a formal scorecard for comparing MSSP hunt services. These practical questions translate its recommendations into a buyer’s discussion; they are not a vendor ranking.
| Area | Ask the provider | Why it matters |
|---|---|---|
| Scope | Does hunting cover the provider’s RMM and privileged access as well as customer identities and endpoints? | A provider management-plane foothold can create risk across connected customer environments. |
| Telemetry | Which identity, endpoint, network, remote-access, RMM, and recovery-related events can the service access and retain? | Hunt conclusions depend on available records; missing sources leave blind spots. |
| Method | Does investigation include identity anomalies, unusual remote logins, and activity that could impair recovery, or rely only on static IOC matching? | Behavior and context can reveal leads that are not limited to known indicators. |
| Response | Are escalation authority, evidence preservation, customer coordination, containment, and recovery roles agreed and exercised? | A credible finding is useful only if the parties know how to act on it. |
| Freshness | How are threat hypotheses and actor-specific indicators reviewed as advisories change? | Indicators and TTP information can be updated; stale material can misdirect a hunt. |
Keep guidance, obligations, and claims in proportion
The cited advisories provide recommendations, not a guarantee that a particular service will find every foothold or stop every ransomware incident. The May 2022 MSP advisory and the interagency ransomware guide are useful baselines, but organizations should confirm current guidance and follow local incident-reporting and regulatory obligations. CISA’s Cyber Threat Hunt Assessment page describes a Department of Justice service for federal agencies; it should not be treated as a generally available commercial MSSP offering.
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