CHAIN-188 — Application Insights sample rate too aggressive

Summary

Severity: Low · Likelihood: Medium · Logic: ALL

Why this chain matters

App Insights sampling is set to 5%. Only 1 in 20 requests is logged. During an incident, the SOC cannot tell whether an anomalous request pattern is real or a sampling artefact. Sparse data forces conservative (slow) decisions.

Component rules

This chain fires when its trigger conditions are met by the following rules. Click any rule to see its detection logic and compliance mappings.

Rule ID	Role
zt_vis_006	Trigger
zt_vis_011	Trigger

Attack walkthrough

Step 1 — Most attacker requests never land in App Insights.

Actor: Attack traffic
MITRE ATT&CK: T1070
Enabled by: zt_vis_006

Attacker gain: Reduced detection signal.

Step 2 — Cannot distinguish real attack from baseline noise.

Actor: SOC
MITRE ATT&CK: T1070
Enabled by: zt_vis_011

Attacker gain: Investigation slowdown.

Blast radius

Initial access	Sampling decision.
Max privilege	Detection signal dilution.
Data at risk	App telemetry integrity
Services at risk	App Insights consumers

How the logic works

The chain fires only when every rule above has at least one finding in the current scan. Missing any one rule breaks the chain — so remediating any single step disrupts the attack path.