Security for real estate and proptech: shielding high-value transactions against fraud
Real estate firms broker purchases, sales, and rentals that move large sums and sensitive records. Using an anonymized case study, we show how Decripte detects, contains, and designs anti-fraud controls against the compromised-email wire-transfer scam.
Direct answer
To protect a real estate firm or proptech, you need four fronts operating together: continuous monitoring (24x7 SOC) that detects anomalous access and account takeover attempts on the portals; anti-fraud controls in the payment flow, with confirmation of banking details through an alternative channel (verified callback) before any transfer; LGPD compliance covering the customer-record database; and an Incident Response plan capable of containing a compromised email within 1 hour. The costliest vector in this industry is wire-transfer fraud via BEC (Business Email Compromise), in which the fraudster intercepts the negotiation and swaps the banking details moments before payment — and it is prevented with process, not technology alone.
24/7
SOC monitoring portals and email
<=1h
Incident containment SLA
LGPD
Compliant customer-record database
BEC
#1 fraud vector in the industry
In summary
- ›Wire-transfer fraud (BEC) is the industry's greatest financial risk: the fraudster compromises an email in the negotiation and swaps the banking details before the property payment goes through.
- ›No payment banking details should be accepted by email without confirmation via verified callback on an independent channel — this process control prevents the majority of losses.
- ›Real estate and proptech portals suffer account takeover via phishing and password reuse; MFA, anomalous-login detection, and a 24x7 SOC are the edge defense.
- ›The customer-record database (ID documents, tax IDs, proof of income, financial data) is sensitive personal data under the LGPD; a leak triggers a duty to notify the ANPD and the data subjects.
- ›Fast response matters: containing a compromised email within 1 hour breaks the fraud chain before the transfer is completed.
Cibersegurança para Real Estate & Proptech
Real estate firms broker purchases, sales, and rentals that move large sums and sensitive records. Using an anonymized case study, we show how Decripte detects, contains, and designs anti-fraud controls against the compromised-email wire-transfer scam.
Why real estate firms and proptechs are prime targets
Real estate firms and proptechs occupy an unusual spot on the risk map: they combine extremely high per-transaction value — a property purchase moves hundreds of thousands to millions of reais in a single transfer — with dense personal-data repositories and negotiation processes that rely heavily on email and messaging. For a fraudster, this is the ideal scenario: a single successful scam pays for months of effort, and the attack surface (agents, clients, closing agents, notaries) is broad and decentralized.
Unlike e-commerce, where fraud is spread across many small purchases, in a property purchase fraud is concentrated: one wrong payment and the loss is total. And unlike a bank, a real estate firm rarely has a dedicated security team watching the flow. It is this gap — high value without proportional oversight — that scammers exploit.
The vector that causes the most damage: BEC
Business Email Compromise is the wire-transfer scam. The fraudster gains access to an email inbox involved in the negotiation — the agent's, the client's, or the closing agent's — watches the conversation for days, and, at the exact moment of payment, sends fake banking details while impersonating the legitimate party. The money goes to the scammer's account and recovery is difficult.
The remaining vectors round out the picture: rental scams with fake listings and impersonation of agents, account takeover on search and management portals, leaks of customer records containing personal documents, and phishing campaigns using the firm's brand to deceive clients.
The five concrete threats in the industry
The risk map every real estate firm should have on the wall
Priority threats
- ✓Wire-transfer fraud (BEC): swapping banking details at the moment of the purchase payment
- ✓Rental scams and impersonation: fake listings and agents using the real brand
- ✓Customer-record data leaks: ID documents, tax IDs, proof of income, and financial data exposed
- ✓Account takeover: hijacking client and agent accounts on the portals
- ✓Phishing: fake emails and pages to steal credentials and divert payments
Each threat calls for a specific control, but they chain together. Phishing feeds account takeover, which grants access to email, which enables BEC. That is why the defense cannot be piecemeal: breaking the chain at any link already reduces the risk of the next link. A good security program attacks the first links (phishing and ATO) with prevention and the last ones (BEC) with process and detection.
Why verified callback is non-negotiable
The cheapest and most effective anti-fraud control in the industry is a process rule: no banking details received by email or message are accepted without confirmation via a phone call to a previously registered number (callback). This simple step defeats BEC even when the email is already compromised, because the fraudster does not control the voice channel to a known number.
Is real estate & proptech data already exposed or up for sale? Find out now — for free.
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Anatomy of the compromised-email wire-transfer scam
The most dangerous vector deserves a close look. BEC in a property purchase tends to follow a predictable script, which is good news: a predictable script is a defensible script.
The phases of the scam
First, the compromise: the fraudster gains access to an email inbox in the negotiation, usually through phishing or a leaked and reused credential. Second, silent observation: they create forwarding rules and filters to monitor the conversation unnoticed, learning names, amounts, dates, and the tone of the messages. Third, the insertion: at the moment of payment, they send an email (from a nearly identical domain — typosquatting — or from the compromised inbox itself) with 'new banking details' and a plausible pretext. Fourth, the financial exfiltration: the victim transfers to the scammer's account, which disperses the money quickly.
The detail that gives the scam away
There is almost always a technical signal before the loss: a newly created automatic forwarding rule in the email inbox, a login from an unusual geolocation, or a sender domain with one letter changed. A SOC that monitors these signals detects the scam during the observation phase — days before the transfer.
It is this window between the compromise and the payment — often several days — that Decripte turns into a defensive advantage. Detecting the malicious forwarding rule or the anomalous login within this window means aborting the scam before the money leaves.
How Decripte structures the anti-fraud defense
Defending a real estate firm is not about installing a product; it is about designing a system of controls that covers identity, email, the payment flow, and the database. Decripte structures this in layers that reinforce one another.
Defense in depth applied to the industry
The edge (anti-phishing and MFA) prevents the initial compromise. Monitoring (24x7 SOC over email and portals) detects what got past the edge. Process (verified callback at payment) neutralizes BEC even with a compromised email. Compliance (LGPD over the customer-record database) limits the damage of any leak. Each layer covers the failures of the previous one.
The key point is that the process layer — the banking-confirmation-by-callback rule — works even when all technical defenses fail. That is why it is the first control we implement: it offers the best cost-benefit ratio in the entire industry.
Brand impersonation monitoring
Decripte continuously monitors the registration of domains resembling the firm's (typosquatting) and the emergence of fake pages and listings using the brand. Identifying a look-alike domain before it is used in phishing or a rental scam enables preemptive blocking and takedown.
LGPD compliance: the customer-record database is the most regulated asset
Every real estate firm accumulates a database that, under the LGPD, is highly sensitive: copies of ID documents and tax IDs, proof of income and residence, banking data, registration forms and, in rentals, guarantors and guarantees. A leak of this database is not just a reputational problem — it triggers concrete legal obligations.
Duty to notify the ANPD
The LGPD (Law 13.709/2018) requires that, in a security incident that may pose relevant risk or harm to data subjects, the controller notify the ANPD (National Data Protection Authority) and the affected data subjects within a reasonable timeframe. Not having a ready response plan turns a technical leak into a compliance failure with exposure to sanctions.
Decripte treats compliance as part of the defense, not as separate bureaucracy. We map where personal data lives (email, CRM, portal, spreadsheets), apply minimization and access control, and prepare the notification runbook so that, if the worst happens, the legal response is fast and correct. Well-executed compliance reduces both the probability and the cost of an incident.
Minimum LGPD hygiene for real estate firms
- ✓Map every repository that stores client documents
- ✓Apply role-based access control — an agent does not need to see the entire database
- ✓Encrypt sensitive documents at rest and limit retention to what is necessary
- ✓Keep a runbook for notifying the ANPD and data subjects ready to use
- ✓Record consent and legal basis for processing each category of data
What would an incident in real estate & proptech 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.
Pentest and validation: find the flaw before the fraudster does
Real estate portals and proptech platforms expose logged-in areas for clients and agents, integrations with payment gateways, search APIs, and document-upload functions. Each of these points is a potential door. Decripte's Pentest exercises those doors the way a real attacker would, following recognized methodologies such as the OWASP Top 10 for web applications and the OWASP API Security Top 10.
What the Pentest typically finds in the industry
Access-control flaws that let one user view another's data (IDOR), document uploads without validation that become an intrusion vector, the absence of brute-force protection on the portals (enabling account takeover), and exposure of sensitive data in API responses. Finding this in a test is orders of magnitude cheaper than discovering it in a leak.
The Pentest result is not a list of problems for the client to solve alone — it is a remediation plan prioritized by real risk, with retesting to confirm that each flaw has actually been closed.
Continuous operation: a 24x7 SOC over what matters
Fraud does not keep business hours. The wire-transfer scam is often executed precisely at moments of least vigilance — weekends, the eve of a holiday, the end of the workday. That is why monitoring must be continuous and focused on the signals that precede fraud.
What Decripte's 24x7 SOC watches at a real estate firm
The creation of suspicious forwarding rules and filters in email inboxes, logins from unusual geolocations or devices on the portals, spikes in authentication attempts (a sign of account takeover), the registration of look-alike brand domains, and the emergence of phishing pages. Each alert is triaged by analysts and, when confirmed, escalated for containment.
The difference between an alert and a loss is the speed of the response. When the SOC detects a sign of compromise, the Incident Response team steps in with a containment SLA of within 1 hour — enough time to revoke access, take down malicious rules, and warn the parties to the negotiation before the transfer is completed.
Anatomy of a real case: the wire-transfer scam in the purchase of an apartment
Real, de-identified example
Anonymized real example (with no identification of the client). A mid-sized real estate firm was brokering the purchase of an apartment worth R$ 780,000. The negotiation was running by email among the buyer, the agent, and the firm's finance department. Unnoticed by anyone, the agent's email inbox had been compromised weeks earlier by a phishing campaign — the fraudster was silently reading the entire conversation, waiting for the moment of payment. Decripte had been engaged for 24x7 SOC and Incident Response a few days before, with email monitoring recently activated.
Detection
Decripte's 24x7 SOC generated a high-priority alert: an automatic forwarding rule had been newly created in the agent's inbox, silently redirecting messages containing the words 'payment', 'transfer', and 'account' to a hidden folder. In parallel, a login to the inbox was recorded from a geolocation inconsistent with the user's routine.
Triage
The analysts correlated the two signals and classified the event as an email compromise in progress (BEC) — not a false positive. They identified that a high-value negotiation was active in that inbox and that payment was scheduled for the following days. The Incident Response team was activated immediately.
Containment
Within the SLA of within 1 hour: the malicious session was revoked, the account password reset with reinforced MFA, and the hidden forwarding rule removed. Crucially, Decripte instructed finance and the buyer NOT to process any transfer without confirmation via callback to a previously known phone number — stopping the scam before the money left.
Eradication
The investigation confirmed the entry vector (phishing weeks earlier) and checked all of the firm's inboxes for other malicious rules and persistent access. A look-alike brand domain, registered by the fraudster to reinforce the scam, was identified and referred for takedown.
Recovery
The legitimate parties to the negotiation reconfirmed the true banking details through a verified voice channel. The transfer was completed to the correct account. MFA was enabled on all inboxes, and the portal received anomalous-login detection.
Compliance
Since there had been unauthorized access to an inbox containing personal data, Decripte conducted the impact assessment under the LGPD and prepared the response documentation, advising on any communication to the ANPD and the data subjects according to the assessed risk.
Lessons and controls
Decripte designed and deployed the permanent anti-fraud controls: a mandatory verified-callback rule for any banking details, continuous monitoring of email rules and brand impersonation, and anti-phishing training for agents. The process that failed became a control that does not depend on luck.
Outcome with Decripte
The R$ 780,000 scam was aborted in the window between the compromise and the transfer — exactly the interval the 24x7 SOC exists to watch. More important than avoiding the single loss was the structural outcome: the firm came out of the incident with anti-fraud controls designed, universal MFA, active impersonation monitoring, and an LGPD runbook ready. The case illustrates Decripte's thesis: most wire-transfer fraud shows days of detectable signals before the loss, and process plus monitoring turn that window into a defense.
Don’t wait for the incident. Start hardening real estate & proptech today.
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How Decripte responds to a fraud incident at a real estate firm
When a real estate firm calls Decripte in the face of a compromised email or suspected wire-transfer fraud, the response follows a tested flow, with a containment SLA of within 1 hour to contain before the money leaves.
- Activation and immediate triage: we classify the severity, identify whether a high-value negotiation is at risk, and mobilize the Incident Response team.
- Containment within 1 hour: we revoke active sessions, reset credentials with MFA, remove malicious forwarding rules, and isolate the compromised inboxes.
- Blocking the financial flow: we advise suspending any pending transfer and confirming banking details via verified callback on an independent channel.
- Forensic investigation: we identify the entry vector, the scope of the access, and which personal data was exposed, preserving evidence.
- Eradication and takedown: we eliminate persistence, sweep the remaining inboxes, and refer look-alike domains and phishing pages for removal.
- LGPD assessment: we measure the impact on personal data and prepare the documentation for any communication to the ANPD and the affected data subjects.
- Verified recovery: we restore secure operation, confirm the legitimate details of the negotiation, and validate that the accounts are clean.
- Permanent controls: we design the anti-fraud rules, activate continuous monitoring, and train the team so the vector does not recur.
How Decripte structures the security of a real estate firm or proptech
Beyond reacting to incidents, Decripte builds a security program on pillars that reinforce one another — covering identity, email, the payment flow, the database, and continuous operation.
Anti-fraud controls at payment
Deployment of the verified-callback rule and approval segregation for banking details. It is the control that neutralizes BEC even when the email is already compromised — the best cost-benefit in the industry.
Identity and edge defense
Mandatory MFA on email and portals, anomalous-login detection, brute-force protection, and anti-phishing. It prevents the initial compromise that opens the way to all the other scams.
Continuous monitoring (24x7 SOC)
Permanent surveillance of email rules, anomalous access, account takeover attempts, and brand impersonation. It detects the scam during the observation phase, days before the transfer.
LGPD compliance for the customer-record database
Mapping of personal data, role-based access control, minimization, encryption, and a ready runbook for notifying the ANPD. It limits the damage and legal cost of any leak.
Offensive validation (Pentest)
Regular testing of portals and APIs following OWASP, finding access-control flaws and data exposure before a real attacker uses them, with a remediation plan and retesting.
Incident Response ready
An actionable plan and team with a containment SLA of within 1 hour, industry-specific runbooks, and evidence custody — so the window between compromise and loss becomes a defense, not a loss.
Recommended plans for Real Estate & Proptech
SOC 24x7
Wire-transfer fraud is executed outside business hours; continuous monitoring of email and portals detects malicious forwarding rules, anomalous logins, and account takeover attempts in the window before payment.
See plan →Incident Response
When an email is compromised, containing it within 1 hour — revoking access and blocking the transfer — is the difference between an alert and a loss of hundreds of thousands of reais.
See plan →Compliance
The customer-record database (ID documents, tax IDs, income, banking data) is personal data under the LGPD; a leak triggers a duty to notify the ANPD, and compliance reduces the probability and cost of the incident.
See plan →Pentest
Real estate and proptech portals and APIs expose logged-in areas and document uploads; testing finds access-control flaws and account takeover before the fraudster does, following OWASP.
See plan →Frequently asked questions
What is the wire-transfer scam (BEC) in a property purchase?
It is the fraud in which the scammer compromises an email inbox in the negotiation, watches the conversation silently and, at the moment of payment, sends fake banking details while impersonating the legitimate party. The victim transfers the property's value to the scammer's account. It is the costliest vector in the industry because the loss is total and concentrated in a single transaction.
How do I keep my real estate firm from falling for wire-transfer fraud?
The most effective control is a process one: never accept banking details by email without confirming via a phone call to a previously registered number (verified callback). Combine this with MFA on email inboxes, detection of suspicious forwarding rules, and continuous monitoring (24x7 SOC). Start with a free assessment at decripte.com.br/intelligence-center.
Could my email be compromised without my noticing?
Yes. The scammer often creates hidden forwarding rules and filters to read the conversation unnoticed, sometimes for weeks. Signs include messages disappearing from the inbox, forwarding rules you did not create, and logins from unusual locations. A SOC detects these signals automatically.
I leaked customer data. What does the LGPD require me to do?
The LGPD requires that, in an incident that may create relevant risk or harm to data subjects, you notify the ANPD and the affected data subjects within a reasonable timeframe, describing the nature of the data, the risks, and the measures taken. Decripte conducts the impact assessment and prepares this documentation as part of Incident Response.
How do I protect the client and agent portals against intrusion?
Account takeover is prevented with mandatory MFA, brute-force protection, anomalous-login detection, and remediation of the flaws a Pentest reveals (such as broken access control). The 24x7 SOC monitors spikes in authentication attempts that signal attacks in progress.
How do I fight fake listings and agents using my brand?
With impersonation monitoring: Decripte watches the registration of domains resembling yours (typosquatting) and the emergence of fake pages and listings, referring them for takedown before they are used in rental scams or phishing against your clients.
How long does Decripte take to contain an incident?
The containment SLA is within 1 hour from activation. In a compromised email, that means revoking access, removing malicious rules, and blocking the pending transfer before the money leaves — within the window between the compromise and the payment.
Where do I start if I have never done anything about security?
Start with the free Threat Management assessment at decripte.com.br/intelligence-center, which reveals your real exposure. Based on the result, Decripte recommends the right set (usually 24x7 SOC + Incident Response + Compliance). To engage, go to decripte.io/start or reach out via /contato.
Sector terms
- BEC (Business Email Compromise)
- Business email compromise: a scam in which the fraudster accesses a legitimate email inbox to intercept negotiations and divert payments, typically swapping banking details at the moment of the transfer. It is the highest-loss vector in the real estate industry.
- Account Takeover (ATO)
- Account takeover: when an attacker takes control of a legitimate user's account (client or agent) on a portal, usually via phishing or reuse of a leaked password, to access data or defraud transactions.
- Verified callback
- A process anti-fraud control: confirming banking details via a phone call to a previously registered number, on a channel independent of email, before making any transfer. It neutralizes BEC even with a compromised email.
- Typosquatting
- Registration of domains nearly identical to the company's (with letters changed or transposed) to deceive victims in phishing and brand impersonation, common in rental scams and payment diversion.
- ANPD
- National Data Protection Authority: the body that oversees compliance with the LGPD in Brazil and to which the controller must report security incidents that may pose relevant risk or harm to data subjects.
- SOC 24x7
- A Security Operations Center that operates 24 hours a day, 7 days a week, monitoring logs, email, portals, and threats in real time to detect and escalate incidents at any hour — including the moments of least vigilance when fraud tends to occur.
Decripte protects and responds to incidents in real estate & proptech.
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.