Suspicious Microsoft Entra Device Code Authentication Flow
- Product
- azure
- Service
- signinlogs
- Author
- HuntRule
- Published
- 2026-10-25
- Updated
- 2026-10-25
ATT&CK techniques
Initial Access → Cred AccessRecon
Resource Dev
Execution
Persistence
Priv Esc
Defense Evasion
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact
What it detects
This rule detects sign-ins that complete through the OAuth device code authentication protocol in Microsoft Entra. The EvilTokens phishing-as-a-service kit abuses the device code flow to trick victims into authorising attacker controlled devices and harvest refresh tokens. Because device code is uncommon for ordinary interactive users its appearance should be reviewed against expected device enrollment activity.
Reporting behind it
- sekoia.comhttps://www.sekoia.com/blog/new-widespread-eviltokens-kit-device-code-phishing-as-a-service-part-1
- attack.mitre.orghttps://attack.mitre.org/techniques/T1528/
- attack.mitre.orghttps://attack.mitre.org/techniques/T1078/004/
- huntress.comhttps://www.huntress.com/blog/oh-auth-2-0-device-code-phishing-in-google-cloud-and-azure
- securelist.comhttps://securelist.com/microsoft-device-code-phishing-attack/120350/
- attack.mitre.orghttps://attack.mitre.org/techniques/T1621/
- volexity.comhttps://www.volexity.com/blog/2025/02/13/multiple-russian-threat-actors-targeting-microsoft-device-code-authentication/
- attack.mitre.orghttps://attack.mitre.org/techniques/T1078.004/
- microsoft.comhttps://www.microsoft.com/en-us/security/blog/2025/02/13/storm-2372-conducts-device-code-phishing-campaign/
- attack.mitre.orghttps://attack.mitre.org/techniques/T1566/002/
- blog.talosintelligence.comhttps://blog.talosintelligence.com/artoken-inside-an-eviltokens-affiliate-panel-targeting-microsoft-365/
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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