Suspicious Tycoon 2FA Phishing Script Retrieval

ATT&CK techniques

Cred Access → Collection

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
- T1557Adversary-in-the-Middle
Discovery
Lateral Movement
Collection
- T1557Adversary-in-the-Middle
C2
Exfiltration
Impact

What it detects

This rule detects retrieval of the randomly numbered myscr JavaScript file served by the Tycoon 2FA phishing kit. The kit loads a script matching the /myscr######.js pattern to render its credential-harvesting page, so this URI shape signals an AiTM phishing landing.

Reporting behind it

Related detections9 linkedT1557 — drag to rearrange

Suspicious Firefox Enterprise Root Certificate Trust Enabled

Malicious Root Certificate Installed via certutil addstore for AiTM Interception

Suspicious Code of Conduct Phishing Email From cocinternal.com Sender (via m365)

Suspicious Entra Sign-In With Axios Automation User-Agent via AiTM Token Replay (via azure)

Suspicious Tycoon Phishing-as-a-Service Credential Exfiltration Path (via proxy)

Suspicious OfficeHome Sign-In With Axios User Agent via Tycoon 2FA Proxy

Suspicious AWS AiTM Phishing Kit Endpoint Access via Proxy

Possible AiTM Phishing Sign-On Evaluation Denied by Okta FastPass

Malicious Evilginx AiTM Phishing Proxy Default TLS Certificate

Suspicious Tycoon 2FA Phishing Script Retrieval

Pivot detection · T1557 · 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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