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Evil twin + captive portal → credential harvest

Spoof the corporate SSID with a stronger signal and a captive portal that looks like the company AD login. Auto-connecting clients submit creds to the attacker page.

Filed by AD Knowledge Base
§ Kill-chainDrag · zoom · scroll

§ Context

Assumed environment: target SSID is open / WPA2-PSK and devices auto-reconnect. Attacker is in physical range with high-gain antenna + ESP32-class device or laptop.

§ Steps

  1. 01
    Capture creds via portal pageInitial Access
    T1078— Valid Accounts
  2. 02
    Validate creds against domainCredential Access
    W-AUTH-STUFFING— Credential Stuffing
  3. 03
    Enumerate target SSID + clientsReconnaissance
    N-ARP-RECON— ARP Sweep / LAN Discovery
  4. 04
    Spin up rogue AP, same SSID, captive portalInitial Access
    WIFI-EVIL-TWIN— Evil Twin / Rogue AP
  5. 05
    Deauth clients off the legitimate APImpact
    WIFI-DEAUTH— Deauthentication DoS

§ References

§ Frequently asked

What is the "Evil twin + captive portal → credential harvest" attack path?
Spoof the corporate SSID with a stronger signal and a captive portal that looks like the company AD login. Auto-connecting clients submit creds to the attacker page. It chains 5 steps drawn from real-world offensive-security techniques.
What starting position does this attack require?
The first step is Capture creds via portal page (T1078) — a initial access primitive. Assumed environment: target SSID is open / WPA2-PSK and devices auto-reconnect.
What is the final impact of this kill-chain?
The final step lands on Deauth clients off the legitimate AP (WIFI-DEAUTH), which falls under Impact. From here, an operator typically pivots into post-exploitation or maintains persistence.
How can defenders detect or prevent this attack?
Detection and prevention vary per step. Refer to each linked MITRE ATT&CK entry under "References" — every technique on that page lists defensive controls, detection telemetry, and known threat-actor usage.

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