Suspicious Entra Sign-In to OfficeHome with axios User Agent
- Product
- azure
- Service
- signinlogs
- Author
- HuntRule
- Published
- 2026-06-28
- Updated
- 2026-08-28
ATT&CK techniques
Initial Access → CollectionRecon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact
What it detects
This rule detects a successful Entra ID sign-in to the OfficeHome application where the user agent contains axios, an automation library used by the Tycoon 2FA adversary-in-the-middle platform. Tycoon 2FA relayed intercepted credentials and stolen session cookies through scripted axios clients to authenticate as the victim. A non-browser axios agent completing sign-in to OfficeHome indicates automated session token replay from an AiTM phishing kit.
Reporting behind it
- esentire.comhttps://www.esentire.com/blog/microsoft-announces-disruption-of-tycoon-2fa-in-coordination-with-industry-partners
- attack.mitre.orghttps://attack.mitre.org/techniques/T1557/
- attack.mitre.orghttps://attack.mitre.org/techniques/T1539/
- attack.mitre.orghttps://attack.mitre.org/techniques/T1078/004/
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