Yoav Nathaniel

Yoav Nathaniel



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SalesPharce: Hackers Exploit Salesforce, Phish Partners and Customers

What’s more dangerous than hackers running amok in your corporate email?  How about if they had global access to your salesforce.com account? Salesforce.com [$CRM] i...

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MetaMorph HTML Obfuscation Phishing Attack

In yet another example of a phishing campaign impersonating Microsoft’s voicemail notification, we see an HTML attachment that leads to a credential-harvesting URL. ...

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Office 365 Credential Validator Phishing Attack

Hackers are using Microsoft Azure Blob Storage to specifically attack Office 365 admins to take over the Office 365 environment. Although windows.net phishing attack...

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HTML Attachments: The Latest Phishing Trend Targeting Office 365

The average person interacts with HTML every day while surfing the internet. Unless they are a UX developer or designer, however, they probably shouldn’t expect to r...

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When Whitelists Pile-Up: Email Security and Technical Debt

Recently, I analyzed the inboxes of a company representing a typical enterprise account of more than 10,000 email users. I found something alarming. Because of white...

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Root Domain Hack Impacts 70% of Email Gateway Customers

Hackers are bypassing email security gateways and sending phishing emails directly to Google and Office 365 root domains. If you’re using a gateway, and your mail fl...

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The NoRelationship Attack Bypasses Office 365 Email Attachment Security

Avanan identified a new phishing attack that bypasses EOP (Exchange Online Protection) URL filters, which scan Office documents like Word (.docx), Excel (.xlsx), and...

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Z-WASP Vulnerability Used to Phish Office 365 and ATP

Executive Summary: The name Z-WASP references the zero-width space (‌) that hackers added to the middle of a malicious URL within the RAW HTML of the email. Wi...

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ZeroFont Phishing: Manipulating Font Size to Get Past Office 365 Security

Recently, we have been seeing a number of phishing attacks using a simple strategy to get their blatant email spoofs past Microsoft's phishing scans. The tactic, whi...

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baseStriker: Office 365 Security Fails To Secure 100 Million Email Users

Update: Microsoft has repaired this vulnerability on 5/16/18, two weeks after we first reported it to them. We recently uncovered what may be the largest security fl...

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The "Ronald Reagan" Attack Allows Hackers to Bypass Gmail's Anti-phishing Security

We started tracking a new method hackers use to bypass Gmail's SPF check for spear-phishing. The hackers send from an external server, the user receives the email fr...

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What to Do After You Have Fallen Victim to a Phishing Attack

Even if you could block 100% of malware and phishing, it is still possible to have a compromised account: a lost post-it note, a massive Linkedin-type password breac...

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Attack Report: Excel Phishing Attack that Bypasses Office 365

This targeted phishing attack against Office 365 Outlook customers impersonates Excel Online in an HTML attachment in order to trick users into entering their creden...

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Attack Report: Office 365 Security Hacked Using Google Redirect

A new widespread phishing attack against Office 365 email customers uses Google's App-Engine website to redirect victims to download malicious files. Avanan security...

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Attack Report: Office 365 Security Bypassed Using Hexadecimal Escape Characters

In several past blogs, we described how hackers bypass Office 365 Security with Punycode encoding, and then Unicode characters. In this attack report we discuss an a...

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Attack Report: Unicode-Based Phishing

This is a large scale phishing attack against Office 365 that we have been seeing across the majority of our Office 365 customers. The attack takes advantage of Offi...

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