AN0407: Analytic 0407
Detection of iptables, nftables, or firewalld rule modifications. Correlation of sudden drops in active firewall rules with suspicious processes suggests adversarial evasion.
Analyst context for executives and security teams
This analytic matters because Linux host firewalls are often a last local control when network segmentation or perimeter controls are bypassed. Sudden changes to iptables, nftables, or firewalld rules can signal an attempt to weaken visibility or access restrictions, especially when tied to unusual processes. For leaders, the value is validating whether Linux firewall configuration changes are monitored as security-relevant events, not treated only as routine administration.
Executive priority
Prioritize this where Linux systems support critical services, regulated workloads, or incident containment plans. The key business question is whether the organization can prove when local firewall protections changed, who or what changed them, and whether those changes aligned with approved maintenance. This supports operational resilience, audit evidence, and faster incident decisions during suspected evasion or containment failure.
Technical view
For SOC and IR teams, validate monitoring for modifications to iptables, nftables, and firewalld rules on Linux. The supplied analytic emphasizes correlation: a sudden drop in active firewall rules becomes more meaningful when associated with suspicious processes. Detection engineering should therefore combine firewall rule state/change evidence with process execution context, user or service account context, and change-management expectations. Because no ATT&CK detection logic or relationships were supplied, local baselining is required to distinguish administrative firewall changes from potentially adversarial evasion.
Likely telemetry
- Linux process execution telemetry, including command line, parent process, user, and executable path
- Firewall rule state or configuration change records for iptables, nftables, and firewalld
- System logs or audit logs showing privileged configuration changes
- Service management logs for firewalld or related firewall services
- Change-management or maintenance-window records to validate expected administrative activity
Detection direction
- Baseline normal firewall rule counts and expected rule-change patterns on Linux systems.
- Alert on sudden drops in active firewall rules, especially outside approved maintenance windows.
- Correlate firewall modifications with process context and flag unusual parent processes, unexpected users, or nonstandard execution paths.
- Tune for legitimate administration, automation, configuration management, and deployment tooling to reduce false positives.
- Identify blind spots where hosts do not forward audit, process, or firewall configuration telemetry to the SOC.
Mitigation priorities
- Ensure Linux firewall administration is restricted to authorized privileged users and approved automation.
- Maintain documented firewall baselines for critical Linux systems so rule removal can be recognized quickly.
- Integrate firewall configuration changes into change-control and incident response workflows.
- Preserve sufficient host logging to reconstruct which process and account changed firewall rules.
- Review critical Linux assets for reliance on local firewall rules as part of containment or segmentation strategy.
Analyst notes and limits
This is a detection analytic, not a technique object. Its practical value is strongest when paired with host process telemetry and firewall state monitoring. The analytic is Linux-specific and focuses on iptables, nftables, and firewalld rule modifications. No relationship context was supplied, so no mapping to specific techniques, groups, software, or campaigns is inferred.
The official detection field is not provided, tactics are not specified, and no relationships were supplied. This take therefore avoids claims about specific adversaries, active exploitation, or guaranteed coverage. Local environment evidence is required to determine normal firewall administration patterns, telemetry availability, and alert thresholds.
Analytic 0407
Detection of iptables, nftables, or firewalld rule modifications. Correlation of sudden drops in active firewall rules with suspicious processes suggests adversarial evasion.
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
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Imported snapshots across ATT&CK releases (1)
| Release | Bundle imported | Object version | Modified | Status | Raw hash |
|---|---|---|---|---|---|
| 19.1 | 1.0 | Current bundle | c62bda235032… |
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 AN0407Open source URL
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