A recent phishing campaign looks incredibly believable. It impersonates Microsoft and Office 365 by spoofing their emails and login page. Victims unwittingly hand over their Office 365 credentials, and everything grows worse from there.
How This Office 365 Phishing Campaign Works
This phishing campaign starts with an email related to a problem with your Office 365 account. This problem requires an admin’s attention. The link in the email leads to a very convincing Office 365 login page.
Once the admin logs in, the attacker doesn’t just have valid Office 365 credentials. They have administrative credentials that grant them control over all email accounts for that domain. As a result, the attacker can begin accessing user emails or taking advantage of single-sign-on systems.
To make matters worse, attackers can use the domain to send out a new wave of attacks. Using validated domains allows them to bypass Office 365 spam filters. That’s played a major factor in the success of this campaign.
Campaign Warning Signs
Knowing what to look for can keep you from becoming the next victim. Here’s everything we know so far.
As we just mentioned, this message likely won’t be flagged as spam. It looks similar to the one below.
The sender varies, but they follow the format below. The domain variables change with each account.
- “Services admin center”<MicrosoftExchange329e71ec88ae4615bbc36ab6ce41109e@redacted.com>
Email Subject Line
So far, researchers have only seen two subject lines.
- Re: Action Required!
- Re: We placed a hold on your account
The links in the email typically lead to these two URLs:
Prepare & Prevent Phishing
Take some time to train your employees on phishing campaign indicators. Read our posts: 2019’s Latest Phishing Tricks & 5 Tips to Recognize Phishing Emails. Both help readers learn to recognize a phishing email. Simple preparation can prevent your organization from becoming the next victim of a phishing attack.
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