Suspicious Cloud Sign-In From an Anonymizer or High-Risk Session (via signinlogs)

ATT&CK techniques

Initial Access → Defense Evasion

Recon
Resource Dev
Initial Access
- T1078.004Cloud Accounts
Execution
Persistence
- T1078.004Cloud Accounts
Priv Esc
- T1078.004Cloud Accounts
Defense Evasion
- T1078.004Cloud Accounts
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects an Entra ID sign-in flagged with an anonymized IP address or a high real-time risk level, indicating access through Tor or a VPN anonymizer or from a session Microsoft's risk engine deems likely compromised. Compromise of cloud accounts is the most prevalent technique in the Red Canary Threat Detection Report. Detecting anonymized and high-risk sign-ins surfaces suspicious identity access at the authentication boundary.

Reporting behind it

Related detections9 linkedT1078.004 — drag to rearrange

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Suspicious AWS Federated Console Login From Programmatic Credentials

Suspicious M365 Legacy Authentication via BAV2ROPC Client via m365

Suspicious STS AssumeRole With Exfil Session Name via CloudTrail (via cloudtrail)

Suspicious AWS Console Login Without MFA

Suspicious Entra Sign-In to OfficeHome with axios User Agent

Suspicious AWS STS Session Token and Role Chaining Abuse via CloudTrail (via aws)

Suspicious Cloud Sign-In From an Anonymizer or High-Risk Session (via signinlogs)

Pivot detection · T1078.004 · 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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