CaptiveCrunch
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Microsoft has warned that hotel, conference, and other hospitality Wi-Fi networks are being actively abused by a Russian group to target travelers worldwide. The campaign, dubbed “CaptiveCrunch” turns a routine Wi-Fi login moment into an opportunity to compromise corporate accounts and devices.
From the user’s perspective, nothing looks out of the ordinary: they connect to hotel Wi-Fi, get the usual captive portal prompt, and perhaps see a familiar‑looking message about needing to update something before they can browse. However, behind the scenes, the allegedly state-linked group position themselves in the network path and manipulate DNS (Domain Name System) and HTTP traffic from captive‑portal Wi-Fi.
From there, several things can happen:
Logins are stolen: The user’s browser session is redirected to attacker‑controlled phishing pages, like fake Microsoft login prompts, where credentials, device codes, or OAuth tokens are harvested.
Malware is downloaded: The user is presented with fake update or ClickFix dialogs that download malware. In these cases, usually a remote access trojan (RAT) plus an infostealer.
A machine-in-the-middle attack (MitM) where traffic is quietly proxied through attacker infrastructure, putting the user in a position for further credential theft.
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Microsoft has warned that hotel, conference, and other hospitality Wi-Fi networks are being actively abused by a Russian group to target travelers worldwide. The campaign, dubbed “CaptiveCrunch” turns a routine Wi-Fi login moment into an opportunity to compromise corporate accounts and devices.
From the user’s perspective, nothing looks out of the ordinary: they connect to hotel Wi-Fi, get the usual captive portal prompt, and perhaps see a familiar‑looking message about needing to update something before they can browse. However, behind the scenes, the allegedly state-linked group position themselves in the network path and manipulate DNS (Domain Name System) and HTTP traffic from captive‑portal Wi-Fi.
From there, several things can happen:
Logins are stolen: The user’s browser session is redirected to attacker‑controlled phishing pages, like fake Microsoft login prompts, where credentials, device codes, or OAuth tokens are harvested.
Malware is downloaded: The user is presented with fake update or ClickFix dialogs that download malware. In these cases, usually a remote access trojan (RAT) plus an infostealer.
A machine-in-the-middle attack (MitM) where traffic is quietly proxied through attacker infrastructure, putting the user in a position for further credential theft.
@wtg thanks for this. My most recent hotel stay was actually on a university campus, so I used the campus wi fi service (which is called eduroam and should be very secure). But I have a lot of conference travel coming up this fall and next spring, and most of those are massive hotel/convention center places.
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