AN1903: Analytic 1903
Monitor for device alarms produced when device management passwords are changed, although not all devices will produce such alarms. Monitor for device credential changes observable in automation or management network protocols.
Analyst context for executives and security teams
This analytic matters because unexpected changes to device management passwords can affect control over industrial devices and may signal a security or operational governance issue. For executives and security leaders, the decision value is confirming whether the organization can see and explain credential changes on ICS devices, especially where loss of access could disrupt response, maintenance, or recovery.
Executive priority
Treat this as an ICS access-control and operational resilience question: can the business prove who changed device management credentials, when, and whether the change was authorized? Priority should be higher for environments where unmanaged password changes could delay incident response, maintenance, or restoration. This also supports audit evidence for privileged access governance, but the ATT&CK object notes an important limitation: not all devices produce alarms for these changes.
Technical view
SOC, IR, and OT security teams should validate whether device management password changes generate alarms or observable events in automation or management network protocols. Because no platform, tactic, or ATT&CK relationship context is supplied, implementation should be environment-specific: identify relevant ICS devices and management paths, then test whether authorized credential changes are visible in alarms, protocol telemetry, or management logs.
Likely telemetry
- Device alarms related to management password changes
- Automation network protocol observations showing device credential changes
- Management network protocol observations showing device credential changes
- Change-management records or maintenance tickets used to validate authorization
- Asset inventory identifying devices that do or do not generate password-change alarms
Detection direction
- Confirm which ICS devices produce alarms when management passwords are changed and document gaps where they do not.
- Correlate password-change alarms or protocol observations with approved maintenance windows and change records to reduce false positives.
- Validate collection from both automation and management network paths where credential-change activity may be observable.
- Tune alert handling to distinguish authorized credential rotation from unexpected or unexplained changes.
- Account for a key blind spot from the source object: absence of an alarm does not prove absence of a password change.
Mitigation priorities
- Prioritize an inventory of devices and management interfaces where credential changes must be monitored.
- Establish or validate formal approval and documentation for device management password changes.
- Ensure SOC or OT monitoring workflows receive available device alarms and relevant management or automation protocol telemetry.
- Define response procedures for unexplained credential changes, including ownership, access recovery, and operational safety coordination.
- Use testing during approved maintenance to confirm telemetry and alert routing rather than assuming device coverage.
Analyst notes and limits
This is a detection analytic in the ICS ATT&CK domain, external ID AN1903. The official description focuses on monitoring device alarms and observable automation or management network protocol evidence for device credential changes. No relationships, tactics, platforms, or separate official detection text were supplied, so the take emphasizes validation of local telemetry and governance rather than specific tooling or ATT&CK technique context.
The supplied object is sparse: no platforms, tactics, labels, relationships, or official detection logic are provided. Device support varies, and the source explicitly notes that not all devices produce password-change alarms. Local asset details, protocol visibility, and change-management evidence are required to determine actual coverage.
Analytic 1903
Monitor for device alarms produced when device management passwords are changed, although not all devices will produce such alarms. Monitor for device credential changes observable in automation or management network protocols.
How security teams should use this page
Treat this object as behavior context, not an attribution claim. Validate the related groups, software, data sources, and mitigations against official ATT&CK relationships and your own telemetry before making control-coverage decisions.
All related ATT&CK context
No relationships are available in the current normalized data for this object.
Object version and sync metadata
The fields below describe the current mirrored snapshot. When Glexia retains multiple ATT&CK source imports, you can open the table to compare the same object across releases (hashes and MITRE timestamps). For MITRE’s own release notes and roadmap, see ATT&CK resources — Updates .
Imported snapshots across ATT&CK releases (1)
| Release | Bundle imported | Object version | Modified | Status | Raw hash |
|---|---|---|---|---|---|
| 19.1 | 1.0 | Current bundle | 9ccd111f2388… |
Mirrored ATT&CK source object
The raw object is retained through the mirrored ATT&CK source bundle and object hash. The raw endpoint returns the exact object from the mirrored bundle when available.
External references and citations
MITRE external references are preserved separately from Glexia analysis so citations remain traceable to their original source records.
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[1]
mitre-attack AN1903Open source URL
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