Why Law Firms in Montreal and Toronto Are Hacker Targets

Your clients trust you with everything. Cybercriminals know it.

It's 11:22am on a Thursday in Toronto. A senior associate is finalizing documents for a major M&A closing happening tomorrow. The managing partner is on a call with a corporate client. The firm's bookkeeper just received what looks like a wire transfer request from the client's CFO, familiar email domain, professional tone, urgent deadline. She processes it.

By the time anyone realizes the CFO's email was spoofed, $340,000 has landed in a criminal's account overseas. The client is furious. The firm is exposed. The relationship, built over a decade — is over.

This is Business Email Compromise, and it's one of the most common attacks hitting Canadian law firms right now. A Vancouver-based law firm lost CAD $2.3 million in a single BEC attack after fraudulent emails perfectly mimicked legitimate partners.[1] These aren't random attacks. They're deliberate, researched, and targeted at an industry that handles enormous amounts of sensitive data and high-value financial transactions every single day.

Canadian law firms are, in the words of a cybersecurity lawyer at Borden Ladner Gervais LLP's Montreal office, the "bright and shiny object" that cyberattackers seek — a treasure trove of confidential information with security practices that often lag far behind the value of what's being protected.[2]

Why do cybercriminals target the legal profession?

It works, because the math works in their favor.

Law firms in Montreal and Toronto hold some of the most sensitive and valuable data in existence: M&A details before they're public, litigation strategies, intellectual property, real estate transaction records, client financial information, privileged communications that can never legally be disclosed. That combination of confidentiality obligations and high-value data makes the legal sector uniquely attractive to two different types of attackers — those motivated by money, and those motivated by espionage.

Financially motivated attackers want ransom payments and fraudulent wire transfers. Espionage-motivated attackers — including state-sponsored groups, want deal intelligence, litigation strategy, and client lists. A law firm working on a major cross-border transaction or a sensitive regulatory matter may be targeted not for its own data, but for what it knows about its clients.

The numbers reflect the targeting. The average cost of a data breach for law firms in 2024 was $5.08 million USD — a more than 10% increase from the previous year.[3] In 2024, a record 45 ransomware attacks hit law firms globally, compromising 1.5 million records.[4] Among firms that experienced a breach, 56% lost sensitive client information — among the most damaging outcomes possible for a practice built on confidentiality.[5]

For Montreal law firms specifically, Quebec's Law 25 adds a compliance dimension that raises the stakes further. A breach involving personal information now triggers mandatory notification obligations and potential fines. If you haven't built your incident response around Law 25 requirements, a cyberattack becomes both an operational crisis and a legal one simultaneously. (We covered Law 25 in detail in our Bill 25 compliance blog.)

What is the most common type of cyber attack faced by law firms?

Phishing and Business Email Compromise — by a significant margin.

Phishing attacks targeting law firms have become so sophisticated that they routinely bypass advanced spam filters and fool experienced legal professionals. The attacks are researched. Criminals study your firm's website, your LinkedIn profiles, your client relationships, and your deal announcements before crafting an email that appears to come from someone you trust.

BEC attacks — where criminals impersonate executives, clients, or opposing counsel to redirect payments or extract credentials — are particularly devastating in legal environments because the financial transactions are real, large, and move quickly. A lawyer authorizing a wire transfer for a real estate closing doesn't have time to triple-verify every instruction.

Beyond phishing and BEC, the most common attack types hitting law firms include:

Ransomware — Attackers encrypt your files and demand payment to restore access. For a law firm with active matters and court deadlines, even 48 hours of downtime is catastrophic. MBC Law, an Ontario bilingual litigation firm, was hit by ransomware in January 2024. The firm was disconnected from the internet for two weeks and didn't return to full operation for a month. IT recovery and infrastructure upgrades alone cost between $80,000 and $210,000.[6]

Insider threats — Current or former staff, contract IT workers, or partners with access to sensitive systems represent a risk that's harder to detect than external attacks. The Panama Papers — one of the largest data leaks in history — originated from an insider at a law firm.

Credential theft — Stolen login credentials, often harvested through phishing or purchased on the dark web, allow attackers to log into firm systems quietly and gather intelligence over weeks or months before triggering an attack.

Do law firms need cyber security?

This question still gets asked. The answer, unambiguously, is yes, and the gap between awareness and action in the Canadian legal sector is alarming.

Canadian Lawyer Magazine reported in May 2025 that Canadian law firms are "painfully unprepared" for cyberattacks, and that AI is making the situation worse by enabling faster, cheaper, more convincing attacks.[2] The same report noted that 80% of Canadian organizations have experienced an AI-related cyber incident in the past year, yet only 3% are fully prepared to defend against these threats.[2]

Meanwhile, according to the American Bar Association's most recent technology survey, only 34% of law firms have an incident response plan in place. Less than half — 43% — conduct regular online backups of data.[3] Only 26% of law firms believe their firm is "very prepared" to respond to a cyber incident.[5]

These aren't abstract statistics. They describe the actual preparedness level of most firms — including, likely, your direct competitors in Toronto and Montreal. The firms that invest now in getting their security posture right aren't just protecting themselves. They're differentiating themselves. In 2025, more than a third of legal clients said they would pay a premium for a law firm with stronger cybersecurity practices.[3]

Clients are paying attention. The question is whether your firm is.

Looking for managed IT and cybersecurity services built for law firms in Montreal and Toronto? Explore Resitek's cybersecurity services at resitek.com/cybersecurity or book a free consultation at resitek.com/consultations with our team. Call 514-447-7840.

What is the 72 hour rule for data breach?

In Canada, the relevant framework is PIPEDA's breach of security safeguards regulations, which require organizations to report a breach to the Office of the Privacy Commissioner of Canada as soon as feasible after determining that a breach poses a real risk of significant harm. For Quebec firms, Law 25 adds a parallel obligation to report to the Commission d'accès à l'information (CAI) within 72 hours of becoming aware of a confidentiality incident.[7]

For law firms, this creates a compressed timeline during the worst possible circumstances. When ransomware hits on a Friday afternoon — and attackers time their strikes deliberately, your firm has 72 hours to assess the scope of the breach, determine whether personal information was compromised, notify regulators, and begin client notification,  all while trying to restore systems and maintain active matters.

Firms that have never mapped their data, meaning they don't know what personal information they hold, where it lives, or who can access it, face a near-impossible task during that 72-hour window. Matt Saunders, cybersecurity lawyer at BLG's Montreal office, notes that poor data management practices make everything worse if a breach occurs: with proper data mapping, planning, and backups, firms can recover faster and resume operations more quickly. Without that preparation, recovery becomes far more complex.[2]

The 72-hour rule isn't a technicality. It's a forcing function that exposes exactly how prepared — or unprepared — your firm actually is.

What is the 3 2 1 rule for ransomware?

The 3-2-1 backup rule is the baseline standard recommended by the Canadian Centre for Cyber Security for any organization handling sensitive data — and it's especially critical for law firms.[8]

It works like this:

3 — Keep three copies of your data (the original plus two backups) 2 — Store backups on two different types of media such as cloud and an external drive 1 — Keep one copy completely offline and disconnected from your network

The reason the offline copy matters so much: modern ransomware groups specifically target backup systems. A 2025 Sophos report found that 94% of ransomware victims reported attackers went after their backup systems — and more than half of those attacks succeeded.[9] If your only backup is connected to the same network that gets encrypted, you have no backup.

The Canadian Bar Association specifically recommends that law firms maintain backups on removable or cloud devices that cannot be reached by an exploit that gets loose.[10] For a Montreal or Toronto law firm with active client files, M&A deal rooms, and real estate transaction records, the 3-2-1 rule isn't optional. It's the minimum.

What is the most effective control against ransomware?

There isn't one single control that eliminates ransomware risk. Anyone telling you otherwise is selling something. What actually works is a layered approach — multiple controls that each close a different attack vector, so that if one fails, another catches it.

For law firms in Montreal and Toronto, that layered approach should include:

Multi-factor authentication on everything — Email, document management systems, remote access, banking portals. Credential theft is the leading initial access vector in ransomware attacks. MFA stops most credential-based attacks cold.

Email filtering and anti-spoofing controls — Given that phishing and BEC are the top attack types targeting law firms, your email environment needs active filtering, domain authentication (SPF, DKIM, DMARC), and tools that flag external senders impersonating internal addresses.

Endpoint detection and response (EDR) — Every device that touches your network — including home computers used by lawyers working remotely — needs active endpoint protection that can detect and isolate threats before they spread.

Employee training specific to legal industry threats — Generic cybersecurity awareness training isn't enough. Your team needs to understand BEC scenarios specific to legal practice: fake wire transfer requests, spoofed opposing counsel emails, fraudulent client impersonation. Regular phishing simulations keep the muscle memory sharp.

A tested incident response plan — Only 34% of law firms have one.[3] Having a plan that your team has actually practiced — not a document that lives in a folder — is what determines whether a breach becomes a bad week or a business-ending event.

Cyber liability insurance — With cyber liability insurance, firms can mobilize a comprehensive response team with a single call when an attack hits.[2] Without it, you're funding forensic investigators, legal counsel, client notification, and regulatory response out of pocket.

The Canadian Centre for Cyber Security's Ransomware Playbook is a practical starting point for any firm that wants to build these controls systematically.[8]

What are the 4 actions of a data breach response?

When a breach happens — and across the legal sector, the question increasingly is when, not if — the response follows four key steps: contain, assess, notify, and review.

Contain — Isolate affected systems immediately. Disconnect from the internet if necessary. Stop the bleeding before assessing the wound. MBC Law disconnected from the internet within hours of detecting the breach — a decision that limited further unauthorized access.[6]

Assess — Determine what was accessed, what was compromised, and how the attacker got in. This typically requires a cybersecurity forensics firm. For a law firm, the assessment must specifically identify whether personal information was involved, which triggers notification obligations.

Notify — Under PIPEDA and Law 25, notification to regulators and affected individuals is mandatory when there's a real risk of significant harm. This includes clients whose data may have been accessed. For a law firm, client notification is both a legal obligation and a reputational crisis management exercise.

Review — Once the immediate crisis is contained, conduct a full post-incident review. What control failed? What would have stopped it? What needs to change? This step is how firms turn a costly breach into an investment in future resilience.

Having this process documented and practiced before an incident is the difference between a firm that recovers in weeks and one that is still in damage control months later.

RESITEK  has been helping Montreal and Toronto businesses navigate cybersecurity incidents and build the controls that prevent them for over 20 years. If your firm doesn't have a documented incident response plan, that's the first conversation we should have. Book a free consultation at resitek.com/consultations or call us at 514-447-7840.

The bottom line

Law firms in Montreal and Toronto are not random targets. They are deliberate, researched, high-value targets — chosen because of the data they hold, the transactions they facilitate, and the confidentiality obligations that make paying a ransom feel like the only option when systems go down.

The good news is that the controls that meaningfully reduce that risk are not exotic or expensive. MFA, tested backups, email filtering, employee training, an incident response plan — these are the fundamentals that most firms still don't have fully in place. Getting them right is what separates the firms that survive a cyberattack from the ones that don't.

If you're not sure where your firm stands, that's exactly what Resitek is here to help you figure out. Explore our managed IT and cybersecurity services at resitek.com/managed-it-services or book a free consultation at resitek.com/consultations. Call 514-447-7840.

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Sources and references

1. NOVIPRO, Most Common Cyberattacks in 2025 for Canadian Businesses https://www.novipro.com/blog/most-common-cyberattacks-2025
2. Canadian Lawyer Magazine, Canadian law firms are painfully unprepared for cyberattacks https://www.canadianlawyermag.com/news/features/canadian-law-firms-are-painfully-unprepared-for-cyberattacks-ai-is-only-making-it-worse/392438
3. Embroker, Law Firm Cyberattack Statistics and Trends 2025 https://www.embroker.com/blog/law-firm-cyberattacks/
4. Programs.com, The Latest Law Firm Cyberattack Statistics 2026 https://programs.com/resources/law-firm-cyberattack-statistics/
5. Arctic Wolf, Biggest Legal Industry Cyber Attacks https://arcticwolf.com/resources/blog/top-legal-industry-cyber-attacks/
6. PracticePRO, When a Law Firm Gets Hacked: A Case Study in Cybersecurity Risks and Recovery https://www.practicepro.ca/2025/03/when-a-law-firm-gets-hacked-a-case-study-in-cybersecurity-risks-and-recovery/
7. Commission d'accès à l'information du Québec, Law 25 Confidentiality Incident Requirements https://www.cai.gouv.qc.ca/protection-renseignements-personnels/information-entreprises-privees
8. Canadian Centre for Cyber Security, Ransomware: How to Prevent and Recover https://www.cyber.gc.ca/en/guidance/ransomware-how-prevent-and-recover-itsap00099
9. Sophos, State of Ransomware 2025 https://www.sophos.com/en-us/whitepaper/state-of-ransomware
10. Canadian Bar Association, Protecting Your Files from Ransomware Extortion: https://www.cba.org/resources/cba-practicelink/protecting-your-files-from-ransomware-extortion/

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