Malicious Storm-0558 Forged Token Sign-In from MSA Consumer Tenant (via azure signinlogs)

ATT&CK techniques

Defense Evasion → Lateral Movement

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
- T1550.001Application Access Token
Cred Access
- T1606.002SAML Tokens
Discovery
Lateral Movement
- T1550.001Application Access Token
Collection
C2
Exfiltration
Impact

What it detects

This rule detects Entra ID sign-ins whose home tenant is the Microsoft consumer MSA tenant 9188040d-6c67-4c5b-b112-36a304b66dad, the issuer Storm-0558 impersonated with a stolen MSA signing key to forge OpenID v2.0 tokens against Exchange Online and other organizational resources. Tokens minted for enterprise access from this consumer issuer indicate forged-credential authentication and should be treated as identity compromise.

Reporting behind it

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Malicious Storm-0558 Forged Token Sign-In from MSA Consumer Tenant (via azure signinlogs)

Pivot detection · T1550.001 · 9 related

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.

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