Business Email Compromise Prevention After Mid-Year Financial Results | 2026 Practical Guide to CEO Fraud and BEC Peak Season
Overview
From late September through October 2026, mid-year financial results for March fiscal-year companies (covering the first half of fiscal year ending September 2026) are announced in concentration. According to Japan Exchange Group statistics, approximately 78% of the roughly 3,800 companies listed on TSE Prime, Standard, and Growth markets have March fiscal years, and their mid-year results are announced in concentrated fashion between September and November. Meanwhile, this earnings announcement season makes the schedules and contacts of executives and CFOs of listed and large companies publicly available, presenting attackers with an ideal opportunity for targeted attacks. According to National Police Agency 2025 statistics, approximately 3,200 companies fell victim to Business Email Compromise (BEC) annually, with total damages reaching approximately 18.6 billion yen, and the 2-4 weeks following quarterly earnings announcements require particular vigilance as a peak damage period. Attack methods employ multifaceted and sophisticated tactics including: (1) fraudulent wire transfer instructions impersonating executives and CFOs, (2) account change requests impersonating business partners, (3) confidential information demands impersonating auditing firms and lawyers, (4) urgent wire transfers impersonating subsidiaries and affiliates, and (5) foreign exchange wire fraud disguised as overseas transactions.
This article systematically organizes practical BEC countermeasures following the September 2026 mid-year financial results, from the perspectives of executives, accounting and finance managers, sales managers, and general employees. It comprehensively covers the latest BEC attack methods, organizational defense systems, technical countermeasures, immediate response to erroneous transfers, and comprehensive protection using SecureSS. This content directly applies to all business users who handle business email daily, from executives and managers to accounting staff at listed companies, mid-sized companies, and small and medium enterprises.
Why Security Matters Today
BEC countermeasures after mid-year financial results directly minimize corporate financial damage in the following 5 scenarios. These are organized from cases published by the National Police Agency, IPA, and JPCERT/CC in 2025-2026.
- Preventing fraudulent wire transfer damage of millions to hundreds of millions of yen caused by emails impersonating executives and CFOs
- Preventing ongoing misdirected payment damage caused by emails requesting changes to business partner account information
- Preventing leakage of financial confidential information and M&A information through impersonation of auditing firms and lawyers
- Avoiding consolidated-basis damage expansion caused by urgent wire transfer requests impersonating subsidiaries and affiliates
- Reducing the risk of difficult international damage recovery from foreign exchange wire fraud disguised as overseas transactions
SecureSS's Shadowsocks-based VPN and secure DNS features automatically block connections to phishing fake sites when links in business emails are accidentally clicked, and also encrypt communications for executives and accounting staff working remotely, functioning as the final defense line against BEC attacks. This article presents a comprehensive financial damage minimization system combining SecureSS with organizational BEC countermeasure routines.
How to Approach It
Step 1: Understanding and Alertness to Latest BEC Attack Methods
The latest BEC attack methods from 2025-2026 are organized into 5 patterns. Pattern 1 is “CEO Fraud (executive impersonation wire transfer instructions),” including: (1) use of domains closely resembling the actual name and email address of the president, representative director, or CFO, (2) urgent wire transfer instructions timed for periods when contact is difficult such as business trips or meetings, (3) exceptional requests such as “avoid internal approval due to M&A confidentiality” or “immediate transfer for tax measures,” (4) amounts ranging from several million to hundreds of millions of yen, and (5) wire transfer instructions to overseas accounts or new accounts. This is the most frequent pattern in the National Police Agency 2025 statistics, with an average damage of approximately 47 million yen. Pattern 2 is “Business partner account change requests,” including: (1) impersonating accounting staff of existing business partners, (2) justifications such as “we changed accounts for the fiscal year-end” or “new account per auditing firm guidance,” (3) disguising the transaction as normal while only changing the payee account, (4) months-long delays before discovery, and (5) damage discovered only after multiple wire transfers. This pattern causes significant damage to small and medium enterprises with high risk of prolonged impact. Pattern 3 is “Auditing firm and lawyer impersonation,” including: (1) using the actual names of audit firm partners, tax accountants, and lawyers, (2) demands for financial confidential information, M&A information, and litigation information, (3) “do not consult others due to confidentiality,” (4) escalating from information leakage to secondary attacks, and (5) concentrated attacks immediately before earnings announcements. Pattern 4 is “Subsidiary and affiliate impersonation,” including: (1) impersonating subsidiary accounting staff or local office managers, (2) “post-hoc parent company approval is fine,” (3) exploiting confusion in consolidated-basis wire transfers, (4) urgent wire transfers from overseas subsidiaries, and (5) foreign exchange wire transfers in local currency. Pattern 5 is “AI-based voice and writing style imitation,” including: (1) learning and imitating executive past email writing styles using ChatGPT, (2) attempting to bypass phone verification using voice synthesis, (3) rapid sophistication during 2024-2026, (4) making identification by “writing style inconsistency” increasingly difficult, and (5) requiring simultaneous strengthening of both technical and organizational countermeasures. Understanding these 5 patterns enables effective alertness to BEC attacks.
Step 2: Building Organizational BEC Defense Systems
Organizational BEC defense systems are organized into 5 layers. Layer 1 is “Strictification of wire transfer processes,” implementing: (1) approval hierarchy by amount threshold (under ¥500,000 = staff approval, ¥500,000-5,000,000 = manager approval, ¥5,000,000-30,000,000 = executive approval, over ¥30,000,000 = board approval, etc.), (2) mandatory independent verification for registering new payees, (3) minimum 2-3 independent verifications for changing existing payee accounts, (4) additional verification steps for overseas wire transfers, and (5) strict adherence to rules that create no “exceptions” for urgent transfers. Layer 2 is “Multiple communication channel requirements,” implementing: (1) absolute prohibition of wire transfer instructions via email alone, (2) identity verification through minimum 2 channels including phone, in-person, or internal chat, (3) documentation of the process for direct wire transfer instructions from executives, (4) prior agreement on communication flow during business trips or meetings, and (5) maintenance of emergency contact lists. Layer 3 is “Employee education and training,” implementing: (1) quarterly BEC training email campaigns (simulated attacks), (2) individual guidance for those who click or respond incorrectly (as learning opportunities, not punishment), (3) intensive training for accounting and finance staff, (4) integration into new employee training, and (5) executive awareness sharing (understanding that they themselves may be impersonated). Layer 4 is “Incident response system,” comprising: (1) immediate response protocol when BEC is suspected, (2) communication flow among internal IT department, management, and external specialists, (3) immediate contact with banks and wire transfer agents (request for wire reversal), (4) judgment on contacting police, lawyers, and auditing firms, and (5) explanation of impact to business partners and customers. Responding within 24 hours of damage discovery significantly improves the success rate of wire reversals. Layer 5 is “Regular system review,” implementing: (1) annual BEC response protocol audit, (2) continuous collection of new attack method information (National Police Agency, IPA, JPCERT/CC), (3) sharing damage information with peer companies and business partner industries, (4) updating technical countermeasures (email authentication DMARC, etc.), and (5) regular reporting to management. These 5 layers of organizational defense can significantly reduce the probability of BEC damage.
Step 3: Integrating SecureSS and Technical Countermeasures
The integration of SecureSS and technical countermeasures is organized into 5 components. Component 1 is “Introduction of email authentication technology,” implementing: (1) SPF (Sender Policy Framework) record configuration, (2) DKIM (DomainKeys Identified Mail) signature implementation, (3) DMARC (Domain-based Message Authentication) policy strengthening, (4) BIMI (Brand Indicators for Message Identification) support, and (5) automatic quarantine of spoofed emails on the receiving side. According to the Ministry of Internal Affairs and Communications “DMARC Promotion Task Force,” the DMARC adoption rate among Japanese companies was approximately 32% as of 2025, below the Western average (approximately 58%), indicating significant room for improvement. Component 2 is “Protection for executives and accounting staff working remotely,” achieving: (1) encryption of all communications via SecureSS's Shadowsocks-based VPN, (2) securing in-flight and hotel Wi-Fi for traveling executives, (3) protecting business email checking for accounting staff working from home, (4) blocking fake sites using secure DNS features, and (5) unified protection across multiple devices. Component 3 is “BEC suspicious email assessment support tools,” utilizing: (1) pre-scan of attachments and links, (2) detailed analysis of sender addresses, (3) AI detection of writing style and transmission patterns, (4) internal alerts for similar emails across the organization, and (5) automatic sorting of suspicious emails into quarantine folders. Component 4 is “Immediate response to erroneous wire transfers,” implementing: (1) immediate contact with the bank upon discovery after transfer (within 15 minutes is the benchmark for maximizing wire reversal success rate), (2) wire reversal request to the receiving bank, (3) filing a police report (consideration of application of the Wire Fraud Relief Law), (4) international inter-bank coordination for overseas transfers, and (5) consideration of insurance claims (cyber insurance). Component 5 is “Long-term BEC resilience strengthening,” planning: (1) embedding in organizational culture the principles of “no exceptions” and “welcoming reports,” (2) executive mindset reform, (3) sharing BEC countermeasures across business partner industries, (4) protecting executives’ family members with SecureSS Family Plan at ¥1,500/month, and (5) basic protection with the individual plan at ¥500/month. SecureSS's ¥500/month and family plan at ¥1,500/month represent a practical and economical investment as the protection foundation for executives and accounting staff during the BEC peak season following mid-year financial results. Combining these 5 components establishes organizational and technical resilience against BEC attacks.
Summary
Q: If we fall victim to BEC, can we recover the transferred funds?
A: The possibility of fund recovery after BEC damage depends on the response speed across the following 5 stages. Stage 1 “Within 15 minutes of discovery”: High likelihood of wire reversal request to the sending bank being in time, recovery success rate approximately 60-80%. Stage 2 “Within 2 hours of discovery”: Possibility of freezing the receiving account in time, recovery success rate approximately 30-50%. Stage 3 “Within 24 hours of discovery”: Consideration of Wire Fraud Relief Law application, international coordination for overseas transfers, recovery success rate approximately 10-30%. Stage 4 “Within 72 hours of discovery”: Funds likely already withdrawn or transferred, recovery success rate approximately 5-15%. Stage 5 “One week or more after discovery”: Recovery is nearly impossible, consider damage compensation through cyber insurance etc. According to National Police Agency 2025 statistics, the average discovery time for BEC damage is approximately 4.2 days, which is the main cause of difficult recovery. Accounting staff and executives conducting “post-transfer confirmation” on the same day is the most important factor in minimizing damage.
Q: How can you identify executive impersonation emails?
A: The following 5 items help identify CEO Fraud emails. Item 1 “Scrutiny of sender address”: Subtle differences from the actual email address (e.g., ceo@company.jp vs ceo@company-jp.com), discrepancy between Reply-To and sender, using free addresses such as Gmail while claiming to be the president. Item 2 “Abnormality in writing style and request content”: Inconsistency with the usual email writing style, requests to bypass internal approval processes, abnormal emphasis on urgency or confidentiality, instructions “not to confirm by phone.” Item 3 “Unnatural timing”: Sending timed to difficult contact periods such as when the executive is on a business trip or in meetings, sending outside business hours or late at night, concentration around earnings announcements. Item 4 “Alertness to amount and payee”: New accounts with no past transactions, overseas accounts, abnormal transaction amounts, expenditures outside internal budget. Item 5 “Identity verification through alternative channels”: Always verify identity through channels other than email such as phone or in-person, confirmation to the executive’s personal mobile number, confirmation through the executive’s secretary, inquiry through alternative channels such as internal chat. Immediately acting alone on an “urgent instruction from an executive” is a process that organizations must absolutely avoid.
Q: How does SecureSS contribute to BEC attack countermeasures?
A: SecureSS's Shadowsocks-based VPN provides the following 5 types of protection in BEC attack countermeasures. Item 1 “Encryption of executive and accounting staff communications”: Encryption of all communications when checking business email during business trips or while working from home, prevention of man-in-the-middle attacks. Item 2 “Secure DNS features”: Prevention of connections to phishing fake sites even when links in BEC emails are accidentally clicked, prevention of credential theft. Item 3 “Unified protection across multiple devices”: Protection of executives’ and CFOs’ family devices as well with Family Plan at ¥1,500/month, prevention of secondary attacks via family members. Item 4 “Public Wi-Fi security”: Prevention of eavesdropping when checking email via in-flight, hotel, or airport Wi-Fi during overseas business trips. Item 5 “Cost efficiency”: Protection of executives and accounting staff for ¥500-1,500/month, several times more economical than dedicated corporate VPNs, easy adoption even for mid-sized companies. On the other hand, email authentication (DMARC, etc.), organizational wire transfer approval processes, and BEC response protocols must be separately established. Combining three layers of technical, organizational, and human countermeasures establishes BEC resilience.
Three layers of understanding the latest attack methods, organizational defense, and technical integration are indispensable for minimizing financial damage from BEC following the 2026 mid-year financial results. SecureSS's Shadowsocks-based VPN provides the protection foundation for executives and accounting staff during the BEC peak season following mid-year results at ¥500/month and Family Plan ¥1,500/month. Experience the security of your company’s business email environment during the 5-day free trial period.