Double Barrel Phishing

What Is Double Barrel Phishing?

Double barrel phishing splits the attack across two messages. The first is genuinely clean: an introduction, a meeting confirmation, nothing to react to. It gets past your filters and past you. The second arrives later, refers back to the first, and carries the link or the attachment. Once you have had a harmless exchange with someone, your brain files them as safe. You'll learn to judge every message on its own and verify new contacts through a directory instead of the thread.

What You'll Learn in Double Barrel Phishing

• Recognize the two-stage pattern of double barrel phishing where a benign initial message precedes a malicious follow-up
• Evaluate every email independently regardless of prior interactions with the same sender address or thread
• Verify new external contacts through official company directories and known communication channels before sharing information
• Identify cognitive trust bias and understand why a previous safe interaction does not guarantee future messages are legitimate
• Explain how attackers use compromised legitimate email accounts and clean initial messages to bypass email security filters

Double Barrel Phishing — Training Steps

1. Introduction

   Quillmarsh Consulting specializes in connecting talented professionals with clients. You manage a comprehensive database containing sensitive candidate information including resumes, contact details, salary expectations, and personal data.

2. The Unexpected Call

   Alice is reviewing applications at her desk when her phone rings. The caller sounds professional and articulate, introducing himself as 'David Miller', a senior software engineer interested in opportunities at Quillmarsh Consulting.

3. The Attack Begins

   During the phone call, Bob (as David) presents himself as an articulate and knowledgeable professional. The conversation flows naturally as they discuss his background, the role requirements, and company culture. About halfway through the call, Bob steers the conversation in a seemingly innocent direction.

4. Gathering Intelligence

   Alice is being asked what seems like an innocent question.

5. The Email Exchange

   After the positive phone conversation, Alice sends Bob, disguised as 'David', detailed information about several open positions that match his background. Alice wants to enter David's details into the TalentHub Pro database because he seems like a very suitable candidate and she can get a hiring bonus. So she eagerly awaits his response email with his resume.

6. The Preparation

   Meanwhile, Bob prepares a fake TalentHub Pro login page. He has already created urgency for Alice to use TalentHub Pro and is now ready to exploit it.

7. The Phishing Email Arrives

   Alice receives an email that appears to be from the company's IT department. The sender address shows it-support@quillmarsh-consulting-secure.com and includes the familiar company logo and professional formatting that Alice recognizes from legitimate IT communications.

8. Reading the Email

   Alice clicks on the migration link, which opens what appears to be the TalentHub Pro login page. The website looks identical to the system she uses daily - same colors, logo, layout, and familiar interface elements. The URL displays 'http://talenthub-pro-migration.quillmarsh-consulting-secure.com/login' - but Alice is too rushed to notice the missing HTTPS encryption.

9. Enter Credentials

   Feeling the pressure of the 5:00 PM deadline and an urgent need to preserve TalentHub access for adding David's details, Alice enters her username and password. The fake website immediately captures her credentials and displays a convincing message.

10. The Successful Data Breach

    After a few seconds, the page redirects to the genuine Quillmarsh Consulting login page, creating the illusion that the migration was successful.