Windows 10 Beware of Custom themes

Security researcher Jimmy Bayne with a Publication on Twitter announced a gap in their theme settings Windows 10 which can allow malicious users to steal your credentials.

How; creating a theme they can carry out a "Pass-the-Hash" attack.

The ability to install themes from other sources allows them to create malicious themes that, when opened, redirect users to a page asking them to enter their credentials.

Windows allows users to change , από τις Ρυθμίσεις – Εξατομίκευση κάνοντας δεξί κλικ στο τρέχον ενεργό θέμα. Μετά επιλέγετε “Αποθήκευση θέματος για κοινή χρήση”. Αυτό θα δημιουργήσει ένα αρχείο “.” which you can share via email or however you like. The new file can be installed.

Intruders can also create a ".theme" file where the default wallpaper setting leads to a malicious site that requires authentication. There unsuspecting users give their credentials, which are sent with NTLM encryption to the site. The passwords are then read using a special decryption software.

The researcher mentioned a way of protection for these attacks. Extensions such as ".theme", ".themepack" and ".desktopthemepackfile" should be disabled.

Ο Bayne αναφέρει ότι αυτά τα ευρήματα γνωστοποιήθηκαν στο Microsoft Security Response Center (MSRC). Ωστόσο, το σφάλμα δεν διορθώθηκε επειδή ήταν “χαρακτηριστικό από το σχεδιασμό”. Δεν είναι γνωστό η εταιρεία σκοπεύει να διορθώσει το σφάλμα μετά από αυτήν την αποκάλυψη ή εάν αλλάξει τη δομή των for topics to prevent redirects to sites that require authentication.

If you consider that most users are logged in to their Microsoft account at , the theft of credentials jeopardizes a lot of user data - such as email, OneDrive or even Azure data.

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Written by giorgos

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