Module 4 · Business Email Compromise (BEC) — Four Variants and the Defender Stack

Manish Garg
Manish Garg Associate of (ISC)² · RingSafe
May 14, 2026
4 min read
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Why this module exists. Business Email Compromise — the wire-fraud scheme where attackers impersonate executives or vendors and instruct money movement — is the single most financially damaging cybercrime against Indian enterprises. The IC3 records BEC losses worldwide at ~$50B over the last decade. Indian losses are under-reported but follow the same patterns. This module is the pattern catalogue and the defender controls that actually stop the fraud.

Why this module exists. BEC does not need malware, credential theft, or AiTM phishing. It only needs to convince one finance person to send money to the wrong account. The defence is mostly process, not technology. This module is the practitioner pattern.

The four BEC variants

Variant Attacker pose Target
CEO fraud CEO/CFO Finance team member
Vendor invoice fraud Compromised vendor Accounts payable
Payroll diversion Employee HR / Payroll
Attorney impersonation External counsel Finance / legal team
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