How modify authentication process lets attackers keep access after a login check
T1556 Modify authentication process is the MITRE ATT&CK technique an adversary uses to change how a system verifies identity, so that a login check still passes after the attacker has reached a sensitive platform. Instead of stealing a single password, the attacker alters the authentication logic itself, such as a pluggable authentication module on Linux, an identity provider's federation or sign-in component, or a macOS authorization setting. The result is durable access that survives password resets and can be hard to tell apart from a legitimate sign-in. The technique spans nine sub-techniques covering IaaS, identity provider, Linux, macOS and other platforms, and it appears in intrusions after an attacker has already gained a foothold and wants to keep access that is hard to revoke.
In ATT&CK version 20.0, T1556 is mapped to the Defense Impairment tactic (TA0112), which MITRE describes as adversary activity that breaks the security mechanisms, pipelines and tooling defenders rely on to see and trust what is happening. That framing matters here because a modified authentication process weakens the control that normally records who signed in and why. Before you plan detections, confirm which ATT&CK version your SOC content and mapping spreadsheets target. MITRE's release notes show that Defense Impairment was introduced as a separate tactic in v19, so mappings built against earlier Defense Evasion structures may not line up without review.
For your environment, start by listing which IaaS control planes, identity providers, Linux PAM configurations and macOS authorization settings are in scope, and who is authorized to change them. Ask your identity and platform teams to confirm where authentication configuration is stored, whether changes to it are logged, and who receives alerts when it changes. Those answers decide which of the nine sub-techniques you can monitor today and which need new telemetry. Document the ATT&CK version and the sub-technique IDs you are targeting alongside each detection, so that a later release that renames or revokes a technique does not silently break your coverage.
Which telemetry reveals changes to authentication components
This table maps each telemetry source to the change it reveals in authentication components such as PAM modules, identity provider settings, and cloud identity configuration. Read each row as a question: which log would show the change, what field or event to watch, and whether an open-source collector covers it or a custom collector and confirmation in your environment is needed.
| Data source | Signal to look for | Open-source collector |
|---|---|---|
| Process Creation (DC0032) | Unexpected processes invoked against authentication utilities, or authentication-related binaries launched by non-standard parents on Linux and macOS hosts | Wazuh or Velociraptor, with auditd or endpoint process events confirmed in your environment |
| File Modification (DC0061) | Writes to PAM configuration, authentication plugin directories, or login-related libraries outside change windows | Wazuh file integrity monitoring or Velociraptor artifact collection on the configured paths |
| Windows Registry Key Modification (DC0063) | Changes to registry keys that register or order authentication packages and providers on Windows hosts | Wazuh registry monitoring or Velociraptor registry collection, confirmed against your baseline keys |
| Identity provider audit or application logs | Changes to authentication policy, federation trust, credential provider or authentication method settings | Custom collector or vendor log forwarder, since coverage depends on the identity platform and must be confirmed |
| Cloud control plane logs for IaaS | Modifications to identity provider configuration, service accounts, or authentication-related settings on cloud resources | Cloud-native audit logs forwarded to Wazuh or Security Onion, with field mapping confirmed by your team |
| Network Traffic Content (DC0085) | Authentication exchanges that show unusual token or credential protocol behavior after a configuration change | Zeek or Suricata, where protocol visibility exists and is confirmed on your network segments |
| Active Directory Object Modification (DC0066) | Changes to directory objects that govern authentication settings or trust relationships on identity servers | Wazuh Windows event collection, confirmed against the directory audit policy you enable |
Detection ideas for modify authentication process changes
These four ideas cover where T1556 changes usually appear: authentication files on hosts, the processes that touch them, Windows authentication providers, and identity provider trust settings. Each idea pairs a change with an expected approval path, so a rule fires on unapproved change rather than on all change.
Authentication files changed off-window
Alert when files that control authentication on Linux and macOS hosts change outside approved change windows. Watch the PAM configuration directories and the files they reference, and compare each modification against open change tickets. Set the alert threshold from a 30-day baseline of normal writes per host role, and suppress only the paths your configuration management agent owns. Expect false positives from patching, approved configuration management runs and package updates that ship new modules. Under ATT&CK v20.0, map this to File Modification and Audit (M1047), and confirm that file integrity monitoring covers these paths.
Processes that edit authentication settings
Flag process creation events where a process that is not part of your management toolchain writes to authentication settings or launches an editor against them. Correlate the parent process, user context and host role, because an interactive session on a server that has no administrative change scheduled deserves review. Tune by building an allowlist of parent and child process pairs seen on each host class, and set a review threshold for any new pair. Common false positives include package managers, automation runs and scheduled maintenance jobs. Under ATT&CK v20.0, this idea maps to Process Creation and Privileged Account Management (M1026), so confirm that administrator accounts performing these changes are inventoried.
Windows authentication provider registry changes
Alert on new or modified registry values that register authentication packages, password filters or security providers on Windows. Compare each value against a known-good baseline taken from your standard build, and treat any unlisted provider as a priority. Tune the rule by requiring the change to occur outside the software installation window recorded by your endpoint tooling. Expect false positives when approved security agents, identity client updates or operating system patches modify these keys. Under ATT&CK v20.0, this maps to Windows Registry Key Modification and Audit (M1047), and it pairs with the restriction of registry write permissions on domain controllers and servers.
Identity provider trust changes
Alert when an identity provider administrator adds or alters a federation partner, signing certificate, claims provider or trusted sign-in source. Review the actor, source address and whether a matching change record exists before the event closes. Tune by requiring two-person approval for trust changes and by setting an alert on any trust object created outside your change process. Expect false positives from new SaaS onboarding, scheduled certificate rotation and vendor-managed integrations. Under ATT&CK v20.0, map this idea to Application Log Content and Audit (M1047), and confirm with your identity provider vendor which administrative events it logs and retains.
Detecting modify authentication process on each platform
Cloud infrastructure providers record control plane activity for identity and access settings, including changes to how sign-in is configured for managed services, virtual machines and the accounts that administer them. The signal lives in the provider's audit trail, so collection should send events to a central store that workload teams cannot edit.
- Control plane audit logs: Collect administrative activity logs for every account, subscription or project and every region in use, including identity and access management changes and service configuration updates.
- Baseline of normal change: Record which automation roles, pipelines and administrators normally change authentication-related settings and how often, and review that baseline with the platform owner on a fixed schedule.
- Scope to privileged accounts: Alert on authentication-related changes made by roles outside the approved list, and on changes made outside a planned change window.
- Change management correlation: Match each alert against infrastructure-as-code pipeline runs and change tickets so approved deployments close automatically and unmatched changes become investigations.
Confirm with your provider which audit log categories are enabled by default, what retention applies to them in your account tier, and whether log integrity controls are available.
Identity providers hold much of the authentication configuration in modern environments, including federation trusts, token signing settings, sign-in policies and registered application credentials. Changes to these objects may leave few artifacts on endpoints, so the identity provider's own audit log is usually the primary source of evidence.
- Directory and policy audit events: Ingest audit events covering changes to federation settings, signing certificates, multi-factor requirements, conditional sign-in policies and application credentials.
- Baseline of administrators: Document who holds directory administrator roles and which service principals may change authentication settings, then review that list on a fixed schedule.
- Scope to privileged accounts: Prioritize alerts for tenant-wide administrator roles and for any change to a trust relationship with an external identity source.
- Change correlation: Require a change record for each high-impact identity change and treat events without a matching record as incidents until explained.
Confirm with your identity vendor which audit events are emitted for each configuration object, how long they remain in the tenant, and whether they can be streamed to your SIEM without a separate license or connector.
On Linux and macOS, authentication behavior is governed by pluggable authentication modules, service configuration files and directory client agents. Changes to these components appear as file modifications and process activity, so detection depends on endpoint file integrity monitoring, process telemetry and the configuration management tooling that deploys them.
- File modification telemetry: Monitor authentication module configuration directories, SSH daemon configuration and directory client settings, recording the writer and the content hash where the agent supports it.
- Process creation with context: Capture process events for tools that edit authentication configuration or run configuration management, including user and parent process context.
- Baseline by host role: Build separate baselines for bastion hosts, build servers and application hosts, because legitimate authentication changes differ by function.
- Scope to privileged accounts: Alert on changes made by root or equivalent accounts, by service accounts outside configuration management, or in sessions with no linked change ticket.
Confirm with your endpoint and configuration management vendors which paths and events their agents capture by default on your operating system versions, and whether the agent has the privileges needed to read those locations on macOS.
On Windows, authentication behavior depends on registry-backed settings for security packages, network provider order and logon behavior, along with domain-joined components usually deployed through group policy. Windows registry key modification and process creation events form the core signal, supplemented by file activity on domain controllers and directory audit logs.
- Windows registry key modification: Monitor keys that register authentication packages, network provider order and logon customization, and alert on values written outside the approved deployment path.
- Process creation with lineage: Record process creation with command line and parent process, so changes made by unexpected administrative tools stand out against the baseline.
- File modification on domain controllers: Watch the directories where authentication components are installed and the locations that hold domain controller policy objects.
- Baseline and scope: Document the expected writers for each key class, scope alerts to Tier 0 administrators and domain controllers, and allow exceptions only when they are documented and time-bounded.
Confirm with your Windows and endpoint detection vendors which keys and events are collected by default, and test whether your chosen collection configuration captures these events on your domain controller build.
How to validate the modify authentication process detection in a lab
This sequence turns T1556 detection logic into a tested control by agreeing the sub-techniques in scope, running an approved emulation in a private range, and confirming that the expected events reach the SIEM with usable fields. It ends with measured alert timing, alert fidelity and a dated list of gaps.
Confirm the sub-techniques and ATT&CK version in scope
The detection owner and the identity or platform team list which T1556 sub-techniques are in scope, based on the identity providers, IaaS consoles, Linux and macOS hosts and other platforms the organization actually runs. Record the ATT&CK version the detection targets, since releases can rename or deprecate techniques. Done when the scope list names each sub-technique, its platform and the version, and the owner has signed it off.
Agree the emulation plan and approvals
The red team or range lead writes a plan that describes the intent of each scenario, the systems it touches, the accounts used, the time window, the stop conditions and the people who must be reachable during the run. Describe the emulation by the change it simulates and the evidence it should leave, not by tooling or steps. Change approval, the system owner and the SOC lead sign the plan. Done when every scenario has an approved intent, an evidence expectation and a rollback owner.
Prepare logging and capture baselines
The platform team confirms that the log sources needed for the agreed data components, such as Process Creation, File Modification, Windows Registry Key Modification and identity provider audit logs, are enabled on the range and forwarded to the lab SIEM. Capture a baseline of normal authentication configuration changes over a quiet period so that routine admin activity can be recognized later. Done when the baseline export and a log source checklist are stored with the test record.
Run the approved scenario under observation
The emulation runs within the approved window while an observer records the start and end time of each scenario, the target system and the account used. The observer does not interact with the detection rules during the run. Done when the timeline of actions is captured in the test log and the range confirms that all activity stayed inside the agreed scope.
Check that events reach the SIEM with expected fields
The detection engineer searches the SIEM for the events produced by each scenario and checks that they arrived, that timestamps are correct, and that the fields the rule depends on, such as the account, host, process or object name and the changed setting, are populated and normalized. Missing or mis-parsed fields are logged as gaps rather than fixed silently. Done when every expected event is either present with the required fields or listed as a gap with an owner.
Measure time to alert and alert fidelity
The detection engineer records the interval between the scenario action and the first alert, then reviews each alert to decide whether it fired on the intended behavior or on unrelated administrative activity. Record true and false positives against the baseline from earlier. Done when each scenario has a time to alert value, a fidelity assessment and any tuning changes proposed through change control.
Record gaps and retest after tuning
The team writes a gap register that lists missed detections, late alerts, missing fields and noisy rules, each with an owner and a target retest. After fixes are applied, the same scenarios are rerun against the same ATT&CK version and the results are compared with the first run. Done when the register is closed or accepted by the risk owner and the before and after results are stored as evidence for the compliance and audit file.
Tuning false positives for authentication configuration changes
The goal of tuning is to let approved changes to authentication configuration pass quietly while every unexplained change still produces an alert. Before writing any allowlist, assign a named owner to each authentication component that T1556 Modify Authentication Process could touch: domain controllers and their authentication providers, federation and identity provider settings, PAM and SSO modules on Linux and macOS hosts, and the directory or tenant settings that govern MFA and sign-in policy. Keep this inventory in the same system as your change management records, so an analyst can answer one question quickly: who was supposed to change this, and when. Without owners, every alert becomes a investigation from scratch, and teams start suppressing rules to reduce noise.
Link each alert to a change ticket wherever your platform allows it. A practical pattern is to require that a planned change to an identity provider, a PAM configuration file or a registry-backed authentication setting carries a ticket reference, and that the alert enrichment step looks up open changes for the same host or service account within a window your team agrees on. Allowlists should be keyed to specific hosts, service accounts and the exact process or file path involved, not to broad categories such as all administrators or all patching jobs. Review each allowlist entry on a fixed schedule and remove entries whose owner has left or whose change record has closed. Treat any alert that matches an allowlist entry but lacks a matching ticket as a finding to review.
Noisy rules need a review after every platform update, because vendors and distributions routinely change where authentication settings live and which processes touch them. After each update, compare alert volume and content against the previous baseline, and confirm the detection still matches the ATT&CK version your team has mapped it to. A rule that never fires in a lab can still be wrong, since the test may not reproduce the file path, process lineage or account type seen in production. Check every tuning change against the validation results from your cyber range exercises: the expected behavior should still be detected, and approved change simulations should be suppressed only by the intended allowlist entry.
Privileged Account Management and Audit controls for authentication changes
Two ATT&CK mitigations carry most of the preventive and evidentiary weight against T1556 Modify Authentication Process. Privileged Account Management limits who can change authentication components, and Audit makes every change visible enough to investigate and to show an assessor.
Restrict who can alter authentication
Privileged Account Management (M1026) means that only a small, named set of administrators can change authentication modules, identity provider federation settings, domain controller authentication packages and similar components. Review standing administrative rights on identity systems, remove dormant accounts, and require a separate privileged account for identity administration. Confirm that service accounts used by identity tooling cannot modify authentication configuration unless that is their documented purpose. Ask for the current privileged group membership list and its last review date.
Approved change paths for identity
Authentication changes should happen only through a documented change process, such as a ticketed pull request against infrastructure-as-code or an approved administrative workflow. Direct edits on domain controllers, Linux PAM configuration or identity provider consoles should be the exception and generate an alert. The SOC should confirm that each authentication change it sees maps to an approved ticket, and that emergency changes are reviewed within a defined window agreed with the change board.
Audit logging for authentication components
The Audit mitigation (M1047) asks that the systems behind authentication record configuration and administrative events at a level the SOC can use. Confirm that domain controllers, Linux authentication hosts, macOS management tooling and identity provider admin consoles forward audit events to the central log platform. Verify that the logs include the actor, the object changed and the outcome. Test retention by pulling a change from several weeks earlier.
Alerting on authentication configuration drift
Audit data only helps if someone looks at it. Build alerts for changes to authentication-related files, registry keys, identity provider federation or trust settings, and new authentication modules or providers. Tune these alerts against the approved change tickets so that routine work does not hide a malicious change. The SOC should confirm alert ownership, the escalation path to identity engineering, and that a test change in the cyber range produces an alert within the agreed triage window.
Evidence packs for assessors
Compliance assessors will ask to see how privileged access is granted, reviewed and removed, and how authentication changes are logged and reviewed. Prepare a repeatable evidence pack: the privileged group list with review sign-offs, sample change tickets matched to audit log entries, and alert test records from the cyber range. DeployOpen prepares these artifacts for assessments, but independent auditors and certification bodies decide whether the controls meet the applicable criteria, so treat this pack as readiness material, not an attestation.
Triage and response when a modify authentication process alert fires
The first decision on a T1556 alert is whether the change was authorized, and the fastest way to answer it is to check the change record before touching the host or tenant. Confirm whether a ticket, change window or identity-team request covers the modification to the authentication module, provider configuration or federation trust. Then identify the host, tenant or identity provider where the change occurred and the account that made it, including whether that account is a service identity, an administrator or a user who should never edit authentication settings. Record the timestamp, the process or admin API call that performed the change, and the source address. Do not assume a clean change record is proof of legitimacy, because an unauthorized change can be logged under a valid privileged account.
Next, check whether authentication has succeeded for accounts outside the normal population since the change. On the identity side, review sign-in logs for accounts that do not usually authenticate to the affected application, new authentication methods registered for privileged users, and successful logins from unfamiliar locations or clients. On Linux and macOS hosts, compare recent successful logins against the usual account and host baseline. Before you alter anything, preserve the relevant evidence: copies of the affected PAM configuration, provider settings, federation metadata, relevant audit and sign-in logs, and file hashes of modified modules. Export these to write-protected storage with a documented chain of custody, because a reversion that overwrites the only copy of the modified state removes the evidence needed to explain what happened.
Containment should match the confidence you have in the evidence. If the change is unauthorized or unexplained, restrict the affected account, rotate its credentials and revoke active sessions, then consider reverting the authentication configuration to its last approved baseline under change control, with the identity and platform owners signing off on the rollback. If the change is authorized but suspicious, apply tighter conditional access or sign-in restrictions to the affected scope rather than reverting unexpectedly. Escalate to the identity provider owner, the platform owner for the affected hosts or tenant, and the incident commander at the same time, and agree in advance who may approve a rollback out of hours. Confirm with your vendor and internal change board which settings can be reverted safely, since rolling back a federation trust or module can lock out legitimate users.
Rehearsing modify authentication process in a private cyber range
The range should mirror the production identity and logging path closely enough that an alert raised in the range would reasonably be raised in production. Build a private range with a self-hosted identity service, a small set of Linux and Windows hosts that authenticate against it, and a log pipeline that uses the same collection agents, parsers and retention settings as production. Keep the range isolated from production networks and use synthetic accounts and test credentials only. Confirm with your platform team which identity components, directory structures and authentication modules the production estate actually uses, because the range is only useful if those match.
- Identity service: Deploy a self-hosted identity provider with the same protocol types and multi-factor settings used in production, so configuration changes are realistic in form.
- Host set: Include at least one Linux and one Windows host joined to the range identity service, with the same authentication stack and logging policy as production.
- Log pipeline: Forward authentication, process creation, file modification and registry events into the SIEM through the same collectors used in production, such as Wazuh agents or Zeek and Suricata sensors where network telemetry is needed.
- Change baseline: Record a known-good snapshot of authentication configuration and file integrity state before the exercise, so injected changes can be verified against it.
- Access controls: Limit who can modify range configuration and log the exercise operators' actions separately from the defenders' activity.
Check that the range logs show the same fields and time synchronization as production before any scenario begins.
Injects are planned events that the exercise control team triggers during the scenario. Write each inject by its intent, meaning what defenders should be able to notice, rather than by low-level steps. The control team holds the full runbook, and the scenario document describes only the expected telemetry and the decision points for the defenders. All injects should be approved in writing and reversible after the exercise.
- Unapproved configuration change: An authentication configuration on the range identity service is altered outside the change process, so defenders should see a configuration-change event and a change record mismatch.
- Authentication module change: A change to an authentication module or pluggable component on a Linux host is made, which should produce file modification telemetry and a host integrity alert.
- Credential validation anomaly: Authentication succeeds on an account in a way that departs from the baseline pattern, testing whether defenders correlate identity logs with host logs.
- Registry or policy change on Windows: A related policy setting is altered, testing registry modification detection and the link to the identity provider log.
- Rollback request: Defenders are asked to restore the known-good state and confirm that the restoration itself is logged.
Illustrative only: an inject might be announced in the exercise plan as a configuration change with a fixed time window, while the exact mechanism stays with the control team.
Scoring defines what good detection and response look like before the exercise, so the outcome is judged against agreed criteria rather than impressions. Timing targets such as the alert window are set in the exercise plan and are agreed targets for this range, not established benchmarks. Scoring should cover detection, triage quality and the documented gap list, and the scorer should be independent of the defenders being evaluated.
- Alert within the agreed window: Each inject should produce an alert in the SIEM within the window the exercise plan sets for it, measured from the inject timestamp in the control log.
- Correct triage notes: The analyst records which telemetry was checked, whether the change was approved, and what containment or rollback was taken, with timestamps.
- Correlation across sources: Credit is given when identity and host telemetry are linked in one case rather than handled as separate tickets.
- Documented gap list: Every inject that was missed, late or poorly triaged produces a gap entry with an owner, a root cause and a proposed fix.
- Evidence retention: The rule or analytic used, the raw events and the case record are preserved for the post-exercise review.
Confirm the scoring rubric and the alert window with the security lead before the exercise, and make sure the gap list feeds into the detection backlog.
Questions SOC leads and detection engineers ask about T1556
How do I tell a legitimate authentication module update from tampering?
Compare every change against a known-good baseline and a signed change record. Legitimate updates arrive through your patch or configuration management pipeline, at a planned time, with a named owner and a ticket. Tampering usually shows up as a modified authentication module or PAM configuration outside that pipeline, a file hash that does not match the vendor package, or a change made by an interactive session. Build the baseline from the hashes and configuration of authentication components on a clean host, then alert on any drift. File Modification and Process Creation telemetry tell you who changed what and from which process, which is the evidence you need to close the question quickly during triage.
Which authentication logs should I retain, and for how long?
Retain the logs that show who authenticated, from where, and which component made the decision. In practice that means identity provider sign-in and audit events, directory object changes, domain controller authentication events, Linux and macOS authentication and PAM logs, and cloud control plane audit logs for changes to identity settings. Retention periods are set by your regulator, your contracts and your internal policy, not by the detection. Confirm the required period with your compliance lead and with the log platform vendor, and confirm that logs are written to storage the local administrator cannot silently alter.
How do I map detections to ATT&CK version 20.0 and handle future releases?
Record the ATT&CK version in every detection's metadata, for example version 20.0, and map each rule to the technique, sub-technique and data component it depends on. ATT&CK releases can rename, deprecate or revoke techniques, so treat the mapping as versioned content. Use the STIX 2.1 bundles MITRE publishes in the attack-stix-data repository to diff technique IDs between releases, and review your mappings after each release. The v18 release replaced detections in technique pages with detection strategies and analytics, so confirm your rule mappings reference current detection strategy IDs rather than old page text.
How do I test T1556 detections without disrupting production logins?
Test in a private cyber range or a staging identity environment that mirrors your production authentication stack, including the same PAM modules, identity provider configuration and log forwarding. Use an approved change window and a test tenant or test domain so that a rehearsal cannot lock out real users. Keep a documented rollback for every test change, and make sure the test account is clearly marked so that alerts from the rehearsal can be separated from production events. Production validation should be limited to confirming that log sources are arriving and that alert routing works, not to making live changes.
Do these detections need a commercial SIEM, or can open-source collectors do the job?
Open-source collectors can carry these detections when they ingest the required telemetry reliably and keep it intact. Wazuh can collect host logs and file integrity monitoring events, Zeek and Suricata can provide network context, and Sigma rules can be converted to the query language of your chosen backend. The practical test is coverage: confirm each data source for the sub-techniques in scope, check time synchronization, and verify that events are not dropped under load. Whether a commercial SIEM is needed depends on your retention, correlation, and staffing requirements, so assess those with your SOC lead rather than assuming either answer.
Which mitigations should I verify first for T1556?
Start with Privileged Account Management and Audit, the two mitigations ATT&CK maps to this technique. Privileged Account Management limits who can change authentication components and forces those changes through named, monitored accounts. Audit ensures that the change events you depend on are generated and retained. Verify both with evidence: a list of accounts with rights to modify authentication configuration, a sample of recent audited changes, and a test showing that a change on a lab host produces the expected alert. Document the results so that an external assessor can trace each control to its evidence.
What should the SOC do in the first hour after a T1556 alert?
Preserve evidence first, then scope the change. Capture the modified authentication files or configuration, the hashes, and the process and user context from the alert before anyone restarts a service or reverts a file. Compare the artifact with the known-good baseline and check whether an approved change record exists for the same time window. If the change is unexplained, treat the host or identity service as potentially compromised, restrict administrative access to it, and review successful authentications since the change. Write each step into the incident record so that the timeline stands up to later review.
How DeployOpen builds T1556 detections and range scenarios
DeployOpen approaches T1556 Modify authentication process as a bounded engagement inside the client's own environment, covering the identity providers, Linux and macOS hosts and IaaS control planes where authentication changes would surface. Each step produces detection content and evidence that the client's own security team can run, review and maintain.
How we scope
- Agree in writing which identity providers, IaaS accounts and Linux or macOS fleets fall within T1556 coverage.
- Confirm the ATT&CK version the detections target, since releases can rename or deprecate techniques.
- List the nine T1556 sub-techniques and record which ones are in and out of scope.
How we build
- Map Process Creation, File Modification and Windows Registry Key Modification telemetry to each in-scope T1556 detection.
- Write Sigma rules and Wazuh or Security Onion content, with tuning notes for expected administrative changes to authentication settings.
- Validate detection logic against a private cyber range replay before it reaches production monitoring.
How we hand over
- Deliver a mapping of detections to the Privileged Account Management and Audit mitigations, with gaps stated plainly.
- Document alert triage steps, escalation paths and the range exercise results used to validate each detection.
- Walk the client's detection and response team through the content so they can run and adjust it independently.
How we support
- Ask for a written scope that names the review cadence and the systems each retainer covers.
- Retain DeployOpen for re-testing when ATT&CK releases change T1556 mappings or the client adds identity providers.
- Confirm with DeployOpen how the retainer handles rule updates, upgrades and repeated range exercises before signing.
