Suspicious AWS AiTM Phishing Kit Endpoint Access via Proxy

ATT&CK techniques

Initial Access → Collection

Recon
Resource Dev
Initial Access
- T1566Phishing
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
- T1557Adversary-in-the-Middle
- T1621Multi-Factor Authentication Request Generation
Discovery
Lateral Movement
Collection
- T1557Adversary-in-the-Middle
C2
Exfiltration
Impact

What it detects

This rule detects web requests carrying the input_24 parameter to the /api endpoints used by the AWS adversary-in-the-middle phishing kit, which relays victim credentials and MFA responses to the legitimate AWS console. The kit exposes paths such as /api/check, /api/login and /api/auth alongside MFA relay branches for email, sms and gauth. Detecting these accesses is important because they indicate users interacting with a live credential-and-session-stealing phishing site.

Reporting behind it

Related detections9 linkedT1557 — drag to rearrange

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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 Gammadyne Mailer Execution for Direct-to-MX Spam

Suspicious AWS AiTM Phishing Kit Endpoint Access via Proxy

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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