Law firms hold exactly what attackers want: confidential client files, merger details, settlement figures, personal information, and trust account funds. Many firms also run lean IT operations, rely on email for nearly everything, and work under constant deadline pressure. That combination makes legal practices one of the most targeted professional service industries.
Knowing the most common threats is the first step toward protecting your firm and your clients. Here are the attacks we see most often and what you can do about each one.
1. Phishing And Credential Theft
Phishing is still the leading way attackers get into law firms. Messages are made to look like court notices, e-filing alerts, document shares, or client requests. One click on a fake Microsoft 365 login page can give an attacker access to an attorney’s entire mailbox, including privileged communications.
How to reduce the risk: multi-factor authentication on every account, advanced email filtering, and regular phishing awareness training for attorneys and staff.
2. Business Email Compromise And Wire Fraud
Once inside a mailbox, attackers quietly watch conversations. When a real estate closing or settlement payment is coming, they send updated wiring instructions that look like they came from the firm or the client. Funds are often gone before anyone notices.
How to reduce the risk: require verbal confirmation of any wire instruction change using a known phone number, monitor mailboxes for suspicious forwarding rules, and limit who can approve payments from trust accounts.
3. Ransomware
Ransomware encrypts document management systems, case files, and billing data, bringing a firm to a halt. Modern groups also steal data before encrypting it and threaten to publish confidential client information unless a ransom is paid.
How to reduce the risk: endpoint detection and response, 24/7 monitoring, patched systems, and backups stored offline or in immutable storage that are tested regularly. Our ransomware protection services combine these layers.
4. Third-Party And Vendor Risk
Firms depend on case management software, e-discovery platforms, cloud storage, and outside IT vendors. A breach at any of them can expose your data. Attackers also target vendors specifically because one compromise can reach many firms.
How to reduce the risk: review vendor security practices, limit vendor access to what is needed, and require MFA for all remote support connections.
5. Insider Threats And Accidental Exposure
Not every incident is malicious. Sending a document to the wrong recipient, sharing a file link publicly, or keeping client files on a personal device can expose confidential information. Departing employees taking client data is another real risk.
How to reduce the risk: data loss prevention policies, role-based access to matters, and prompt removal of access when people leave.
6. Lost Or Stolen Devices
Attorneys work from courthouses, client sites, and home. Laptops and phones get left behind. Without encryption and remote wipe, a lost device can become a data breach.
How to reduce the risk: full-disk encryption, mobile device management, and strong screen lock policies.
7. Unpatched Remote Access
Older VPN appliances and exposed remote desktop services are common entry points. Attackers scan the internet constantly for known vulnerabilities in these systems.
How to reduce the risk: keep remote access systems updated, retire legacy VPNs where possible, and use secure, MFA-protected remote access.
Why This Matters Beyond IT
Attorneys have ethical duties to protect client information and to understand the technology they use. A breach can lead to bar complaints, malpractice claims, lost clients, and damage to the firm’s reputation. Clients, especially corporate clients, increasingly ask firms to complete security questionnaires before sending work.
Building A Practical Defense
Most firms can dramatically reduce risk with a focused set of controls: MFA, email security, EDR with 24/7 monitoring, tested backups, encryption, and staff training. A written incident response plan ensures everyone knows what to do if something does go wrong.
CTS Companies provides cybersecurity services for law firms in Michigan, helping practices protect client confidentiality without getting in the way of billable work. Talk to an expert about a security review for your firm.