Law Firm Cybersecurity Checklist

For solo and small firms. Practical steps organized around the ABA ethics opinions, written by the people who attack systems for a living.

By Cytronics/Published

  • ///Your technology duties translated into actions you can assign this week
  • ///Stopping wire fraud at closing, plus safe rules for generative AI
  • ///A fillable breach response plan, built around ABA Formal Opinion 483
Get the 7-page PDF
29%

Share of respondents to the ABA's 2023 cybersecurity survey who said their firm had ever had a security breach

19%

Share in the same survey who said they didn't know whether their firm had been breached

$200,000

Paid by a New York law firm in a 2023 settlement after an unpatched email server exposed data on about 114,000 patients of its hospital clients

One inbox can hold the secrets of every client you have

A law firm's email has what attackers want: deal terms, medical records, Social Security numbers and wiring instructions, often all in a single mailbox. Small firms hold the same kinds of secrets as big ones, usually with no security team.

This checklist turns guidance you already know about into tasks someone can actually do. Model Rules and ABA opinions aren't binding on their own, and your state may differ, so take the conclusions to your ethics counsel.

The opinions, translated

SourceWhat it addresses
Model Rule 1.6(c)Reasonable efforts to prevent unauthorized disclosure of or access to client information
ABA Op. 477R (2017)Securing electronic client communications, with a risk-based approach
ABA Op. 483 (2018)Duties after a breach: monitor, stop it, find out what happened, notify clients
ABA Op. 498 (2021)Virtual practice, reasonable precautions and supervision
ABA Op. 512 (2024)Generative AI: competence, confidentiality, communication, supervision and fees

Stop wire fraud: three rules

  • ///
    Call back on every new or changed wiring instruction

    Use a number you already had, never one from the email, every time. No exceptions for urgency or seniority.

  • ///
    Warn clients at engagement, in writing

    Tell them you'll never change wiring instructions by email, and to call you before sending money.

  • ///
    Require two people for trust account wires

    One sets it up, another approves it after the call-back. Set the rule with your bank, not only in an office policy.

How an attacker sees it

We don't need your document system. Give us one lawyer's mailbox and a quiet week. We'll read how you write, learn which deals are closing, and set a rule to hide replies. Then we'll send the wiring instructions ourselves.

What's in the full PDF

  • ///The full checklist for accounts, client files, remote work and AI
  • ///A decision table for when email needs more than email
  • ///A firm wire-safety sheet to fill in
  • ///A breach response plan and contact sheet built around Opinion 483