AN0881: Analytic 0881
Office application auto-loads a non-standard DLL during startup triggered via Office Test Registry key, often without macro warning banners. DLL persistence mechanism circumvents traditional macro defenses.
Analyst context for executives and security teams
This analytic describes a persistence pattern where an Office application can load a non-standard DLL at startup through an Office Test Registry key, potentially avoiding the macro warning controls many organizations rely on. For leaders, the practical issue is control coverage: “macro defenses enabled” does not necessarily mean Office-based startup abuse is covered.
Executive priority
Prioritize this as an Office Suite hardening and monitoring validation item. It matters for business continuity and incident readiness because Office is commonly business-critical, and persistence that occurs at application startup can complicate containment if registry and DLL-loading evidence is not collected. Security leaders should ask whether endpoint telemetry, registry monitoring, and Office application behavior analytics can prove coverage beyond macro blocking.
Technical view
SOC and IR teams should validate visibility into Office application startup behavior, registry changes involving Office Test Registry keys, and Office processes loading unusual or non-standard DLLs. Because the official object provides no detection logic and no ATT&CK relationships, teams should treat this as a detection engineering prompt rather than a complete analytic. Focus validation on whether Office Suite process execution, module-load telemetry, and relevant registry modification events are available and correlated.
Likely telemetry
- Endpoint registry modification events related to Office configuration keys
- Office application process start events
- DLL/module load telemetry for Office processes
- File creation or modification telemetry for DLLs in unusual or user-writable locations
- Endpoint alert and EDR investigation records showing Office startup behavior
Detection direction
- Confirm that registry monitoring includes Office-related Test Registry key changes, not only macro execution events.
- Correlate Office application startup with unexpected DLL loads, especially DLLs outside standard Office or system directories.
- Tune for legitimate administrative or software testing activity to reduce false positives, since the object does not provide allowlist criteria.
- Validate that macro-warning and macro-blocking controls are not being treated as complete coverage for Office persistence behavior.
- Use local baselines for normal Office DLL loading because the official detection field is not provided.
Mitigation priorities
- Harden Office Suite configurations and restrict unnecessary test or diagnostic registry functionality where operationally feasible.
- Limit write access to locations from which Office applications could load non-standard DLLs.
- Ensure endpoint controls monitor registry persistence and module loading, not only document macros.
- Include this behavior in incident response playbooks for Office-related persistence triage.
- Maintain audit evidence showing Office hardening, endpoint telemetry collection, and detection validation results.
Analyst notes and limits
The supplied ATT&CK object is a detection analytic, AN0881, for Office Suite. Its key value is highlighting a blind spot in macro-centric Office defenses: startup-triggered DLL loading via an Office Test Registry key. No tactics, relationships, aliases, or official detection logic were supplied, so the take focuses on defensive validation rather than asserting a specific ATT&CK technique chain.
This assessment uses only the supplied STIX fields, external reference, and relationship context. There are no supplied relationships, no official detection content, and no evidence of active exploitation, attribution, impact, or guaranteed detection coverage. Local registry paths, DLL baselines, and benign testing practices must be confirmed in each environment.
Analytic 0881
Office application auto-loads a non-standard DLL during startup triggered via Office Test Registry key, often without macro warning banners. DLL persistence mechanism circumvents traditional macro defenses.
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 | 94af041597fe… |
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 AN0881Open source URL
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