Possible Mamba 2FA AiTM Phishing URL Pattern

ATT&CK techniques

Initial Access → Collection

Recon
Resource Dev
Initial Access
- T1566.001Spearphishing Attachment
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 HTTP requests matching the Mamba 2FA adversary in the middle phishing URL structure of a single letter path segment m, n or o followed by a query string carrying a Base64 encoded victim token. Mamba 2FA relays Microsoft 365 credentials and session cookies through this pattern to bypass multifactor authentication. Because the pattern is broad it should be corroborated with the known relay domains before action.

Reporting behind it

Related detections9 linkedT1557 — drag to rearrange

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Suspicious Sneaky 2FA Phishing Kit License Check via API Key Endpoint (via proxy)

Malicious TCP Session Hijacking via rshijack

Suspicious Regsvr32 Squiblydoo Remote Scriptlet Execution via Command Line (via process_creation)

Suspicious Entra ID Auth Broker Sign-In With Node.js User Agent via Tycoon 2FA

Malicious EdgeStepper iptables DNS Redirection for Adversary-in-the-Middle

Suspicious Tycoon 2FA Credential Exfiltration Fields

Suspicious Entra Sign-In to OfficeHome with axios User Agent

Suspicious Entra Sign-In Interrupt With High Aggregated Risk via AiTM DNS Hijacking (via azure)

Possible Mamba 2FA AiTM Phishing URL Pattern

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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