AN0277: Analytic 0277
Detects malicious injection behavior involving memory allocation, remote thread queuing via APC (e.g., QueueUserAPC), and altered thread context within another live process to execute unauthorized code under legitimate context.
Analyst context for executives and security teams
AN0277 describes a Windows detection analytic for suspicious code injection patterns: memory allocation, APC-based remote thread queuing such as QueueUserAPC, and altered thread context inside another live process. For leaders, the significance is that this behavior can let unauthorized code run under a legitimate process context, making response decisions and SOC triage harder if endpoint telemetry is incomplete.
Executive priority
Prioritize validation of Windows endpoint visibility and incident response readiness for process injection behaviors. This analytic is useful for assessing whether the organization can produce evidence around memory allocation, thread manipulation, and cross-process execution activity during an investigation. It also supports control and audit discussions about endpoint monitoring depth, not just whether antivirus or EDR is deployed.
Technical view
SOC and detection teams should treat this as a Windows-focused analytic concept for identifying combinations of suspicious process-memory and thread activity: allocation in another process, APC queuing, and thread context changes associated with unauthorized code execution under a legitimate process. Because ATT&CK does not provide a detection implementation, teams need to map the concept to available endpoint telemetry and validate the sequence, process relationships, and target process context in their own environment.
Likely telemetry
- Windows endpoint process telemetry
- Cross-process memory allocation events
- Thread creation, thread context modification, or APC queueing telemetry
- API-level or EDR behavioral telemetry involving QueueUserAPC-like activity
- Parent-child process and process lineage data
Detection direction
- Validate that endpoint tooling can observe memory allocation and thread manipulation across process boundaries on Windows.
- Look for correlated behavior rather than a single API event to reduce false positives: remote allocation plus APC queuing or thread context alteration in a live process is more meaningful than isolated activity.
- Tune against legitimate software that may use injection-like mechanisms, such as security tools, accessibility software, debuggers, or application compatibility components, using local baselines.
- Ensure alerts preserve enough context for triage: source process, target process, user, command line, module/signing information, timestamps, and process lineage.
- Because no official detection logic is supplied, test coverage through controlled validation in a lab before relying on this analytic operationally.
Mitigation priorities
- Confirm Windows endpoint monitoring coverage for process, memory, and thread behavior before treating this as a dependable detection capability.
- Harden endpoint controls that limit unauthorized code execution and suspicious process manipulation where operationally feasible.
- Maintain allowlists or baselines for known legitimate tools that perform injection-like behavior to improve SOC fidelity.
- Ensure incident response playbooks include collection of process lineage, memory-related telemetry, and endpoint containment decision points for suspected injection activity.
- Use findings from detection validation to guide endpoint logging, EDR configuration, and compliance evidence around malicious code execution monitoring.
Analyst notes and limits
This object is a detection analytic, not a technique, and no tactics or relationships were supplied. The value is primarily in guiding validation of Windows endpoint telemetry for injection-like behavior involving APC queuing and thread context manipulation.
The official ATT&CK object provides a description but no concrete detection query, data source list, related techniques, mitigations, or relationship context. Local tooling capabilities and environmental baselines are required to determine detection feasibility, fidelity, and response procedures.
Analytic 0277
Detects malicious injection behavior involving memory allocation, remote thread queuing via APC (e.g., QueueUserAPC), and altered thread context within another live process to execute unauthorized code under legitimate context.
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 | 7c7a7aa66b89… |
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 AN0277Open source URL
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