CHAIN-091 — Managed disk snapshot with overly-permissive SAS

Summary

Severity: High · Likelihood: Low · Logic: ALL

Why this chain matters

A managed disk snapshot is exported via SAS URL with Read access + 7-day TTL. The URL ends up in a support ticket. Anyone with the URL downloads the full disk image — including OS, app secrets, and any cached database files.

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_data_008	Trigger
zt_data_012	Trigger

Attack walkthrough

Step 1 — Find the SAS URL in a leaked email / ticket.

Actor: Attacker
MITRE ATT&CK: T1552.001
Enabled by: zt_data_012

Attacker gain: Disk VHD URL.

Step 2 — Download and mount the VHD locally.

Actor: Attacker
MITRE ATT&CK: T1565.001
Enabled by: zt_data_008

Attacker gain: Full disk offline analysis — extract cached passwords, keys, data.

Blast radius

Initial access	Leaked SAS URL.
Max privilege	Full offline disk analysis.
Data at risk	Everything on the disk
Services at risk	Any app whose state was on the disk

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.