Azure AD Password spray; from attack to detection (and prevention).

The attack

We are using Office 365 creeper to validate if e-mail address exists in Office 365 (Azure AD). We create an <input.txt> file with usernames (e.g. extract them from LinkedIn if you know the format like firstname.lastname@domain.com)

Detection

Detection is important to minimize the impact of the attack although prevention is alwasy better than the cure.

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