Suspicious Google Workspace OAuthLogin From Node.js Client via Tycoon 2FA

ATT&CK techniques

Defense Evasion → Lateral Movement

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
- T1550.001Application Access Token
Cred Access
- T1621Multi-Factor Authentication Request Generation
Discovery
Lateral Movement
- T1550.001Application Access Token
Collection
C2
Exfiltration
Impact

What it detects

This rule detects Google Workspace OAuth token issuance for the reserved client that requests the accounts OAuthLogin scope from Node.js user agents as used in Tycoon 2FA adversary in the middle attacks in Elastic research. This pattern reflects an attacker minting long lived login tokens after phishing the session rather than legitimate browser authentication.

Reporting behind it

Related detections9 linkedT1550.001 — drag to rearrange

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Suspicious Google Workspace OAuthLogin From Node.js Client via Tycoon 2FA

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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