A Houston-area environmental services company recovered every dollar of a fraudulent wire transfer after CMIT Solutions of Austin Central led a 16-hour incident response to a Business Email Compromise (BEC) attack, containing the breach on day one, evicting the attacker from the email environment, and rebuilding the company's defenses so the same attack could not work twice.
BEC is the quietest of the major cyberattacks. Ransomware announces itself; BEC does the opposite. An attacker takes over one legitimate mailbox, learns who approves payments and how they write, then waits for a wire transfer worth stealing. By the time anyone notices, the money has moved. That is how this incident began in November 2023, and why the first 24 hours mattered more than everything that followed.
Project Snapshot
- Client: Environmental services company
- Location: Houston area
- Service: Cybersecurity & MDR
- Scope: 16 hours — full incident response under formal reference IRJR001, from containment through forensic documentation
- Outcome: Fraudulently transferred funds fully recovered six weeks after detection, with the attacker's foothold eradicated
The Challenge
The first symptom looked trivial: a staff member's email password stopped working. Investigation showed something far worse. The account had been compromised once, reset, and compromised again within 24 hours. The attacker held persistence through hidden forwarding rules that copied every inbound and outbound message to an external address, and had read the company's financial correspondence long enough to know when to strike. The result was a fraudulent wire transfer released on a trusted-looking request.
A dark web credential scan run during the initial response pointed to the likely origin: credentials belonging to one of the organization's legal contacts, a law firm, had been exposed in a prior data breach. The attacker never defeated a firewall or an antivirus product. They started with one valid credential and found a company without Multi-Factor Authentication (MFA) on email.
The Solution
CMIT Solutions of Austin Central ran a structured, three-phase incident response across the first 72 hours and the weeks that followed, sequenced so that evidence was preserved rather than destroyed, because that evidence trail is what makes fund recovery possible.
Containment
On day one the team removed the malicious forwarding rules, analyzed headers from the fraudulent messages to trace attacker infrastructure, reviewed mail server logs for unauthorized activity, and reset every compromised password with forced session termination so active attacker sessions died immediately. The dark web scan ran in parallel.
Eradication & Hardening
Over the following days, MFA was enforced on all email accounts, including the admin and scheduling accounts that are commonly overlooked. Email access from outside the United States was blocked, closing off high-risk geographies including China, India, Russia, Saudi Arabia, and Japan. Legacy ActiveSync device connections dating back to the prior year were deleted, and login anomaly alerting was switched on.
Investigation & Documentation
A SentinelOne endpoint scan confirmed the compromise stayed inside email and never reached the endpoints. The team rebuilt the full timeline from the email archiving system, documented the attacker's use of the RSS folder as a covert staging area, a known BEC technique for hiding malicious rules from casual inbox review, and produced a comprehensive Incident Response Report and containment checklist.
What We Delivered
- Malicious email forwarding rules identified and removed, with full header and mail log analysis
- All compromised passwords reset and active attacker sessions terminated
- Dark web credential scan identifying the likely source of the original credential theft
- MFA enforced across every email account, including admin and scheduling accounts
- Geographic access restrictions blocking email logins from outside the United States
- Legacy ActiveSync connections purged and login anomaly alerting enabled
- SentinelOne endpoint scan confirming the breach never spread beyond email
- Formal Incident Response Report and post-incident containment checklist under reference IRJR001
The Results
Six weeks after detection, the organization received confirmation that the fraudulently transferred funds had been recovered in full. That outcome is genuinely uncommon: the FBI reports that less than 30% of funds stolen in BEC cases are ever returned. It was possible here because the response was fast and disciplined enough to preserve the evidence trail and support timely engagement with the bank.
The company also came out of the incident with a far stronger email environment. MFA, geographic access restrictions, anomaly alerting, and credential monitoring are now standing controls, the same controls that would have stopped the attack before a dollar moved.
Key Takeaways
- In a Business Email Compromise, speed decides the money: fast containment preserves the evidence banks and investigators need to reverse a fraudulent transfer.
- Hidden forwarding rules and stale mobile device connections are how attackers stay in an inbox after a password reset; check both before declaring an account clean.
- Your exposure includes your partners: credentials leaked from a vendor, client, or law firm are a viable path into your business, which is why MFA and credential monitoring are non-negotiable.
If your Austin business handles wire transfers or financial approvals over email, talk to CMIT Solutions of Austin Central about Cybersecurity & MDR before an incident forces the conversation.
