AN0996: Analytic 0996
Monitors execution of older or legacy interpreters (e.g., python2, bash with restricted history logging), downgrade of TLS/SSL configurations, or forced fallback to unencrypted protocols. Detects suspicious reconfiguration of kernel modules or boot loaders to reduce integrity controls.
Analyst context for executives and security teams
This analytic matters because it looks for Linux systems being pushed into weaker operating modes: older interpreters, reduced command-history visibility, downgraded TLS/SSL, fallback to unencrypted protocols, or weakened kernel and boot integrity controls. For leaders, the business issue is not just one command or tool; it is whether critical Linux infrastructure can be quietly reconfigured to reduce security assurance before or during an incident.
Executive priority
Prioritize this as a resilience and assurance question for Linux estates that support critical applications, regulated workloads, or incident response evidence. Security leaders should ask whether teams can prove when encryption settings, interpreter usage, kernel module behavior, or boot-loader integrity controls change, and whether those changes are authorized. This can support control validation, audit evidence, and incident decision-making, but the supplied ATT&CK object does not identify a specific tactic, technique, adversary, or impact scenario.
Technical view
SOC and detection teams should validate visibility into Linux process execution, configuration changes, protocol/security configuration changes, kernel module activity, and boot-loader modifications. Because ATT&CK provides no official detection logic for AN0996, teams should treat this as a detection objective rather than a ready rule: identify local sources that show use of legacy interpreters such as python2, suspicious shell execution patterns with reduced history logging, TLS/SSL downgrade configuration, fallback to unencrypted protocols, and changes that reduce kernel or boot integrity controls.
Likely telemetry
- Linux process execution telemetry, including interpreter name, path, parent process, user, command line, and host context
- Shell and audit logs that can show command execution and changes to history behavior where available
- Configuration-change evidence for TLS/SSL settings and services that may allow unencrypted protocol fallback
- Kernel module load, unload, and configuration telemetry
- Boot-loader and boot integrity configuration file change records
Detection direction
- Baseline expected interpreter usage on Linux hosts, especially where legacy interpreters are still present for business reasons.
- Alert or investigate unexpected execution of older interpreters and changes that reduce command-history or audit visibility, while accounting for administrative maintenance and legacy application dependencies.
- Monitor for configuration changes that downgrade TLS/SSL posture or re-enable unencrypted protocol options; tune against approved compatibility exceptions.
- Track kernel module and boot-loader changes with emphasis on modifications that reduce integrity controls, and correlate with user, process, and change-ticket context.
- Because no ATT&CK detection text or relationships are supplied, avoid assuming technique mapping or adversary behavior; validate detections against local Linux build standards and approved configuration baselines.
Mitigation priorities
- Inventory Linux systems for legacy interpreters, weak protocol compatibility settings, and boot or kernel integrity control posture.
- Remove or restrict unnecessary legacy interpreters and unencrypted protocol options where business applications do not require them.
- Harden configuration management so TLS/SSL, kernel module, and boot-loader changes require authorization and are logged.
- Use file integrity monitoring, audit logging, and endpoint telemetry to preserve evidence of security-relevant configuration changes.
- Align exceptions with change management so SOC teams can distinguish approved compatibility needs from suspicious weakening.
Analyst notes and limits
AN0996 is a detection analytic in the enterprise ATT&CK domain for Linux. The official description focuses on monitoring weakening or downgrade behaviors across interpreters, protocol security, kernel modules, and boot loaders. No ATT&CK tactics, relationships, aliases, or official detection logic were supplied, so this take frames practical validation areas rather than a specific ATT&CK technique chain.
This assessment is limited to the supplied STIX fields, the MITRE external reference, and the absence of relationship context. It does not establish active exploitation, adversary attribution, business impact, or guaranteed detectability. Local asset criticality, approved legacy requirements, telemetry quality, and configuration baselines are required to determine priority and detection fidelity.
Analytic 0996
Monitors execution of older or legacy interpreters (e.g., python2, bash with restricted history logging), downgrade of TLS/SSL configurations, or forced fallback to unencrypted protocols. Detects suspicious reconfiguration of kernel modules or boot loaders to reduce integrity controls.
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 | 7affef7c7126… |
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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mitre-attack AN0996Open source URL
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