CHAIN-115 — VNet flow log missing during incident

Summary

Severity: Medium · Likelihood: High · Logic: ALL

Why this chain matters

VNet NSG flow logs are not enabled. During an incident, SOC cannot see which internal IPs talked to compromised VMs. Reconstructing the lateral movement path requires host-based forensics only.

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_net_013	Trigger
zt_vis_001	Trigger

Attack walkthrough

Step 1 — Lateral-move across VNet without leaving flow record.

Actor: Attacker
MITRE ATT&CK: T1562.006
Enabled by: zt_net_013

Attacker gain: Silent lateral movement.

Step 2 — Cannot enumerate affected hosts during IR.

Actor: SOC
MITRE ATT&CK: T1562.006
Enabled by: zt_vis_001

Attacker gain: Incomplete scoping; longer containment.

Blast radius

Initial access	Any VNet foothold.
Max privilege	Forensic blindness.
Data at risk	IR integrity
Services at risk	All of SOC-assisted incident response

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.