Security for construction: how to safeguard payments, contracts and buyer data
Real estate developers and construction firms move high-value contracts, financing and construction progress payments over email and spreadsheets. It is the ideal setting for wire transfer fraud (BEC), ransomware in the ERP and leaks of buyer data. See how Decripte detects, contains and structures the defense.
Direct answer
To protect a real estate developer or construction firm, start with the money: deploy mandatory out-of-band verification for any change to the bank details of contractors and suppliers, enable continuous email monitoring (DMARC/DKIM/SPF + lookalike domain detection), place the construction management ERP under SOC 24x7 with tested immutable backups, and bring the handling of buyer data into LGPD compliance. The sector's number-one vector is not technically sophisticated — it is payment fraud through email compromise, and it is defeated with a verification process, not just a firewall.
24/7
SOC monitoring ERP and email
<=1h
Incident containment SLA
LGPD
Buyer data as personal data
Out-of-band
Bank account change verification
In summary
- ›The sector's biggest financial loss comes from payment fraud (BEC), not ransomware: the attacker intercepts a contractor's billing communication and diverts the transfer to their own account.
- ›The core defense against BEC is procedural: mandatory out-of-band verification for any change to a bank account, using a pre-registered phone number, never the contact that came in the email itself.
- ›Construction management ERPs and financial systems need tested immutable backups — ransomware that encrypts the base of progress measurements and contracts can halt supplier payments for weeks.
- ›Buyer data (tax ID, income, credit score, financing documents) is personal data under the LGPD; a leak triggers the duty to notify the ANPD and the data subjects.
- ›The supplier chain is part of the attack surface: a compromised email from an outsourced contractor becomes an entry point for the fraud.
- ›Decripte combines SOC 24x7, Incident Response with containment within 1h, Pentest and Compliance alignment in a single defense flow.
Cibersegurança para Construction and Real Estate Development
Real estate developers and construction firms move high-value contracts, financing and construction progress payments over email and spreadsheets. It is the ideal setting for wire transfer fraud (BEC), ransomware in the ERP and leaks of buyer data. See how Decripte detects, contains and structures the defense.
Why real estate developers and construction firms are prime targets
The construction and real estate development sector concentrates three ingredients that attract digital financial crime: a high volume of money in a few payments, long and heterogeneous supplier chains, and financial processes that still rely heavily on email, spreadsheets and attached PDFs. A single construction progress payment or financing disbursement can be worth hundreds of thousands or millions of reais, and the payment order often originates from an exchange of messages with a contractor or supplier.
For the attacker, this means they do not need to break into the vault. It is enough to convince the finance department that the legitimate recipient's bank details have changed. It is the economics of fraud: low technical effort, extremely high return per successful scam.
The vector that drains the most cash in the sector
Wire transfer fraud through email compromise (BEC — Business Email Compromise) accounts for the largest share of direct financial losses at real estate developers. The money leaves via an order that looks legitimate, authorized by real people, within the normal process — which is why a firewall alone does not catch it.
Add to that buyer data: tax ID, proof of income, credit score, mortgage financing documentation, spouse data. All of this is personal data under the LGPD, and some of it is sensitive or financial data. A leak here is not just reputational — it creates a legal notification obligation and exposure to ANPD sanctions.
Anatomy of the real threats to the sector
Wire transfer fraud (BEC)
The classic scam: a contractor's or supplier's email is compromised (or a nearly identical domain is registered). The attacker silently watches the billing conversation for days or weeks, learning the tone, the amounts and the payment schedule. When the real invoice comes due, they send a message asking to update the bank account — claiming a change of bank, an account block or a tax requirement. Finance pays the new account. The money disappears.
Ransomware, data leaks and the supplier chain
Construction ERPs, progress measurement systems and contract databases are targets for encryption: without those databases, the company can neither issue payments nor close out measurements, and the impact on the construction site is immediate. Sales portals, real estate CRMs and bank integrations concentrate sensitive buyer data, exposed by misconfiguration or credential phishing. And the outsourced chain is only as secure as its weakest link — a small contractor's compromised email becomes a trusted springboard to reach your finance department.
Threats mapped in this sector
- ›Wire transfer fraud (BEC) — diversion of a contractor/supplier payment
- ›Ransomware in the construction ERP and the contract/measurement database
- ›Leak of buyer data (tax ID, income, financing)
- ›Compromise of an outsourced supplier's email
- ›Financial phishing targeted at the accounts payable department
Is construction and real estate development data already exposed or up for sale? Find out now — for free.
Sem cartão, sem compromisso. Descubra em minutos o que já vazou da sua empresa e qual é o seu risco real.
Where the defense fails today (and why a firewall is not enough)
Most successful BEC frauds do not exploit a technical vulnerability — they exploit trust and haste. The fraudulent payment order arrives through the legitimate channel, with the right supplier name, at the right moment in the schedule. Perimeter tools do not block an email that looks like an ordinary billing email.
The question that separates who loses from who does not
When a supplier asks to change the bank account, what exactly is your company's process to confirm the request is genuine? If the answer involves replying to the email itself or calling the number that came in the message, the fraud is already pre-approved.
The second blind spot is the absence of continuous monitoring. A compromised email can be watched by the attacker for weeks before the scam. Without detection of suspicious forwarding rules, anomalous logins and newly registered lookalike domains, no one notices that the conversation is being read by a third party.
Common gaps we find at real estate developers
- ✓Bank account change approved based solely on the email received
- ✓No DMARC in reject mode — the company's domain is easily spoofable
- ✓Construction ERP without an immutable backup tested against ransomware
- ✓Buyer data without LGPD mapping or documented legal basis
- ✓Supplier and former-employee access without periodic review
- ✓No monitoring of lookalike domains (typosquatting) of the brand
How Decripte works: detection, containment and out-of-band verification
Our work in the sector starts from one principle: because the money leaves through a process that looks legitimate, the defense must be inside the financial process, not just at the network edge. We combine continuous technical monitoring (SOC 24x7) with the structuring of anti-fraud controls in the payment flow.
Detection and containment
We monitor the email and identity environment for the early signs of BEC: creation of hidden forwarding rules, anomalous logins, recent registration of domains resembling yours or those of key suppliers, and phishing attempts targeted at accounts payable. When compromise is detected, we act with a containment SLA within 1 hour: revoking sessions, resetting credentials, removing malicious email rules and — if the fraud is already underway — immediately engaging the bank to attempt a block/reversal.
Out-of-band verification as a permanent control
The deliverable that reduces risk the most is structural: we deploy a mandatory out-of-band verification process for any change to bank details. Confirmation via a pre-registered phone number (never the number from the received email), dual approval for changes and amounts above a threshold, and an anti-BEC checklist integrated into accounts payable.
Anti-fraud golden rule
No supplier bank account change is executed without confirmation through a second channel independent of the original email. This single control neutralizes most of the sector's BEC scams.
Hardening the construction ERP and backups against ransomware
The construction management, measurement and contract systems are the operational heart. If encrypted, the company stops paying suppliers, loses measurement traceability and misses the schedule. The defense combines prevention, segmentation and — above all — guaranteed recovery.
More important than trying to never be hit is ensuring the company recovers without paying a ransom. That is why we focus on backups that ransomware cannot reach or encrypt, and on real restoration drills — a backup that was never tested is not a backup, it is hope.
Anti-ransomware controls we deploy
- ✓Immutable (write-once) backups with a copy isolated from the network and periodic restoration tests
- ✓Segmentation between the administrative, financial and construction/site IoT networks
- ✓Phishing-resistant MFA on all privileged access and the ERP
- ✓EDR with response managed by the SOC 24x7 to isolate machines in seconds
- ✓A rehearsed ransomware response plan, with a contingency payment runbook
What would an incident in construction and real estate development cost? See your real risk before it happens.
Sem cartão, sem compromisso. Descubra em minutos o que já vazou da sua empresa e qual é o seu risco real.
Compliance: LGPD for buyer data and the supplier chain
Real estate developers handle sensitive personal data of buyers throughout the entire sales and financing journey. This brings concrete duties under the LGPD (Law No. 13,709/2018): a defined legal basis for each processing activity, a record of operations, adequate technical and administrative security, and an incident response plan with the duty to notify the ANPD and the data subjects when the leak could pose a relevant risk.
We work on data mapping, the definition of legal bases, contracts with processors (contractors and providers that process data on your behalf) and the notification plan. When there is card payment capture on sales portals, we also align with PCI-DSS in the applicable portion.
Obligations that most impact the sector
- ›LGPD: incident notification to the ANPD and the data subjects in case of relevant risk
- ›LGPD: processor contracts for suppliers that handle buyer data
- ›PCI-DSS: applicable when there is card capture/processing on sales portals
- ›ISO 27001: a management benchmark for due diligence by banks and financing partners
Testing the defense before the criminal does: Pentest and phishing simulation
A defense that has not been tested is just an assumption. We conduct Pentest against the sales portals, the exposed ERP, bank integrations and the email infrastructure, and we run controlled phishing and BEC simulations against the finance department to measure — with real data — the resilience of the anti-fraud process.
The difference a well-executed offensive test makes is that it turns 'we think we are secure' into a list of fixes prioritized by real risk. It is better to discover the gap in an authorized exercise than in a lost payment.
What a test usually reveals
In typical assessments of the sector we find: sales portals with buyer data accessible through ID enumeration, DMARC absent or in permissive mode (spoofable domain), and finance that approves a bank account change in a simulated phishing test. Each finding becomes a fix prioritized by risk.
Continuous monitoring: SOC 24x7 in the construction context
Fraud and intrusion do not respect business hours — payment scams are usually triggered precisely at month-end closings, the eve of holidays and end of the workday, when the team is in a hurry and the attacker knows it. That is why monitoring is 24x7.
Our SOC correlates events from email, identity, ERP, endpoints and the edge, with playbooks specific to the sector: immediate alert on a forwarding rule created in a finance mailbox, an anomalous login in an executive account, and detection of newly registered lookalike domains mimicking the company or key suppliers.
Start with the free assessment
Decripte's free Threat Management plan (decripte.com.br/intelligence-center) already shows your exposed surface: domains resembling yours, associated leaks and email posture. It is the natural starting point before signing up for SOC or Incident Response.
Anatomy of a real case: the BEC scam that tried to divert a contractor's payment
Real, de-identified example
A real anonymized example (without identifying the client), built from patterns typical of the sector. A mid-sized real estate developer has an outsourced contractor executing the structure of a project. The monthly progress payment, in the region of R$ 480 thousand, is arranged by email between the responsible engineer and finance. The contractor's email is compromised by phishing weeks earlier, and the attacker begins reading the conversation in silence.
Reconnaissance (silent)
The attacker, with access to the contractor's mailbox, creates a hidden forwarding rule and observes the measurement cycle. They learn amounts, payment dates, the names of the parties and the tone of the messages. Nothing is changed yet — just surveillance.
Attack / Fraud trigger
On the date of the real invoice, the attacker replies within the legitimate thread itself, stating that the contractor 'has changed banks due to a tax requirement' and sends new bank details, with a tone of urgency because of the construction schedule. Finance initiates the payment.
Detection
Decripte's SOC 24x7 fires an alert: the sender's domain, although visually identical, shows a DMARC alignment failure, and there is a recent anomalous login in the supplier's account. In parallel, the accounts payable anti-fraud control blocks execution because it is a bank account change without out-of-band verification.
Containment
Within the SLA of up to 1 hour, Decripte engages finance to suspend the transfer, validates by pre-registered phone with the contractor's real contact (confirming there was NO change of bank), and revokes sessions and malicious rules in the supplier's compromised mailbox.
Eradication
Reset of credentials and MFA on the compromised account, removal of the hidden forwarding rules, sweep for persistence and blocking of the lookalike domain. Investigation confirms the exposure window and that no other payment was tampered with.
Recovery
The legitimate payment is executed to the correct, verified account. There was no financial loss. The contractor is advised to clean up their environment, closing the weak link in the chain.
Lessons and structuring
Permanent deployment of mandatory out-of-band verification for a bank account change, DMARC in reject mode, continuous monitoring of lookalike domains, dual approval for payments above a threshold and anti-BEC training for finance.
Outcome with Decripte
In this real anonymized example, the combination of detection by the SOC 24x7 and the accounts payable anti-fraud control prevents the R$ 480 thousand from leaving. More important than the scam avoided: the developer emerges from the incident with a BEC-proof financial process, continuous monitoring of email and identity, and the supplier chain included in the security posture. It was exactly what the fraud tried to exploit — trust without verification — that became the company's strongest control.
Don’t wait for the incident. Start hardening construction and real estate development today.
Comece pelo diagnóstico gratuito agora e veja em minutos o que já vazou. SOC 24x7 e contenção em até 1h nos planos pagos.
How Decripte responds to an incident in construction
When there is suspected payment fraud, ransomware or a data leak, every minute counts — especially if a transfer has already left. Our Incident Response flow for the sector follows clear steps, with containment within 1 hour.
- Activation and immediate triage: we classify the incident (BEC underway, ransomware, leak of buyer data) and activate the specific playbook, with a secure communication channel outside the possibly compromised environment.
- Containment within 1h: revoking sessions, resetting credentials, removing malicious forwarding rules, isolating accounts and machines affected by the SOC/EDR.
- Urgent financial action (if a payment is underway): immediately engaging the bank to attempt a block/reversal of the fraudulent transfer and out-of-band confirmation of the legitimate recipient.
- Forensic investigation: determining the entry vector, the exposure window, the scope of the compromise and whether buyer data was accessed or exfiltrated.
- Eradication: eliminating persistence, closing the exploited gaps, hardening email (DMARC/DKIM/SPF) and privileged access.
- Recovery: restoration from tested immutable backups (in the case of ransomware) and a safe resumption of payment and measurement operations.
- Notification and compliance: support in assessing the duty to notify the ANPD and the data subjects under the LGPD when there is relevant risk, with the necessary documentation.
- Lessons learned and structuring: an executive report with the root cause and deployment of the permanent controls (out-of-band verification, continuous monitoring, dual approval) so the same scam does not work again.
How Decripte structures the security of a real estate developer
Response puts out the fire; structuring prevents it from starting. We build the sector's defense on pillars that directly attack the vectors of BEC, ransomware and data leaks.
Anti-fraud in the financial flow
Mandatory out-of-band verification for bank detail changes, dual approval by amount, a supplier list with pre-registered contacts and an anti-BEC checklist integrated into accounts payable — the control that most reduces loss in the sector.
Email and identity security
DMARC in reject mode, correct DKIM and SPF, phishing-resistant MFA, monitoring of forwarding rules and anomalous logins, and detection of lookalike domains mimicking the company and suppliers.
Ransomware resilience
Tested immutable backups, segmentation between the administrative, financial and construction networks, EDR managed by the SOC and a rehearsed recovery plan for the ERP and the contract/measurement database.
Buyer data protection (LGPD)
Data mapping, documented legal bases, processor contracts across the supplier chain, least-privilege access controls and an incident notification plan.
Continuous monitoring (SOC 24x7)
Correlation of events from email, identity, ERP, endpoints and the edge, with sector-specific playbooks and actionable response at any hour, including month-end closings and the eve of holidays.
Recurring offensive validation
Pentest of sales portals, the ERP and bank integrations, and phishing/BEC simulations against finance to measure and fix the real risk before the criminal does.
Recommended plans for Construction and Real Estate Development
Incident Response
When a payment fraud is underway or the ERP has been encrypted, containment within 1h and immediate action with the bank make the difference between recovering the money and losing it.
See plan →SOC 24x7
BEC scams and ransomware are triggered outside business hours; continuous monitoring of email, identity and the ERP detects the compromise before the transfer leaves.
See plan →Pentest
Tests sales portals, the ERP and finance's anti-fraud process with a real phishing/BEC simulation, revealing where the scam would get through before a criminal finds out.
See plan →Compliance
Buyer data (tax ID, income, financing) is personal data under the LGPD; compliance, processor contracts and a notification plan reduce legal risk and ANPD sanctions.
See plan →Frequently asked questions
What is BEC fraud and why is my real estate development company a target?
BEC (Business Email Compromise) is the scam in which the attacker compromises or imitates a supplier's/contractor's email and diverts a legitimate payment to their own account, usually asking for a 'bank details update'. Real estate developers are targets because they move high payments by email, have many suppliers and financial processes rushed by the schedule.
How do I prevent a contractor's payment from being diverted?
The decisive control is out-of-band verification: no bank account change is executed without confirmation through a second channel independent of the email — a call to a pre-registered supplier phone number, never the number that came in the message. Add dual approval by amount and email monitoring.
If ransomware encrypts our construction ERP, can we recover without paying a ransom?
Yes, if there are immutable (write-once) backups isolated from the network and tested regularly. Most companies that pay a ransom do so because the backup did not exist, was on the same encrypted network or was never tested. Decripte structures and rehearses this recovery.
Is buyer data covered by the LGPD?
Yes. Tax ID, proof of income, credit score, financing documents and spouse data are personal data — some of it sensitive or financial. The LGPD requires a legal basis, adequate security and, in case of a leak with relevant risk, communication to the ANPD and the data subjects.
Our suppliers are small and not very secure. Is that our problem?
It is. A contractor's compromised email becomes an entry point to defraud you. We treat the supplier chain as part of the attack surface: pre-registered contacts, processor contracts under the LGPD and independent verification for any financial change.
How long does Decripte take to contain an incident?
Our containment SLA is within 1 hour from activation. In the case of payment fraud underway, we act in parallel to attempt the block/reversal with the bank while we contain the technical compromise.
Do we need SOC 24x7 even though we are a construction firm, not a technology company?
The scams that drain the most cash in the sector are triggered outside business hours, precisely at closings and the eve of holidays. Continuous monitoring detects the malicious forwarding rule, the anomalous login and the lookalike domain before the money leaves.
Where do we start without signing a contract right away?
With the free assessment at decripte.com.br/intelligence-center (Threat Management), which shows domains resembling yours, associated leaks and email posture. To structure the defense or respond to an incident, talk to us at decripte.io/start or /contato.
Sector terms
- BEC (Business Email Compromise)
- Fraud in which the attacker compromises or imitates a corporate email (of a supplier or of the company itself) to divert legitimate payments, usually requesting a change of bank details.
- Out-of-band verification
- Confirmation of a sensitive request — such as a bank account change — through a channel independent of the one that originated the request, for example a call to a pre-registered phone number, never the contact that came in the email.
- DMARC
- An email authentication standard that, combined with SPF and DKIM, allows rejecting messages that spoof the company's domain, reducing phishing and impersonation. In reject mode, it blocks the spoofed email.
- Immutable backup
- A backup copy in write-once format (it cannot be altered or deleted for a period), isolated from the network, that guarantees recovery even after a ransomware attack encrypts the production systems.
- LGPD
- Brazil's General Data Protection Law (Law No. 13,709/2018), which governs the processing of personal data in Brazil and imposes duties of security, legal basis and incident notification to the ANPD and the data subjects.
- SOC 24x7
- A Security Operations Center that monitors and responds to security events around the clock, correlating signals from email, identity, ERP, endpoints and the edge to detect threats at any hour.
Decripte protects and responds to incidents in construction and real estate development.
Pentest, 24x7 SOC, incident response with a 1-hour containment SLA and compliance — without building an internal team. Or start free by seeing what has already leaked from your company.