Williams, Kastner & Gibbs PLLC Listed by SilentRansomGroup Ransomware Group: Ransomware Claim — What’s Alleged & What To Do

Williams, Kastner & Gibbs PLLC, a U.S. law firm, was listed by the ransomware group SilentRansomGroup on or around December 13, 2024. Public reporting indicates the group claims to have exfiltrated internal files during a ransomware attack. The number of people affected remains unknown, and further details on timing, method, and full scope have not been disclosed by the firm or independently confirmed.

For clients, employees, and others who interact with the firm, the listing raises practical questions about what information may have left its systems and what steps are available while official confirmation is limited.

Inside the incident

According to the available record, SilentRansomGroup listed Williams, Kastner & Gibbs PLLC as a victim and stated that internal files were exfiltrated in a ransomware attack. The listing was reported on December 13, 2024. The group’s materials associated with the claim include a revenue figure of $25.2 million and a total of 172 downloads, along with a brief description of the firm as a provider of legal advisory services that focuses on areas including federal litigation. No independent verification of the intrusion, the volume of data taken, or the exact date of any compromise has been made public. The number of individuals whose information may be involved is listed as unknown. Public detail on how the attackers gained access, whether encryption was deployed, or whether negotiations occurred remains undisclosed.

Who is SilentRansomGroup?

SilentRansomGroup, also tracked in public reporting as Luna Moth, is a ransomware operation that has appeared on leak sites in recent years. The group typically follows a double-extortion model: it claims to steal data before or instead of encrypting systems, then threatens to publish or sell the material if a ransom is not paid. Public analyses of its activity describe frequent use of social-engineering techniques, including callback phishing and voice-based lures that impersonate technical support or trusted vendors, to obtain initial access. Once inside a network, operators have been observed moving laterally, collecting files, and posting victim names on a dedicated leak site. Prior listings have involved professional-services firms, healthcare entities, and other organizations that hold sensitive records. In this case, the group’s claim that it exfiltrated internal files from Williams, Kastner & Gibbs PLLC should be treated as an unverified assertion until corroborated by the firm or forensic reporting.

Williams, Kastner & Gibbs PLLC and its sector

Williams, Kastner & Gibbs PLLC is a law firm that provides legal advisory services. Public descriptions note a focus that includes federal litigation and related practice areas. Like most mid-sized and larger law firms, it routinely handles confidential client matters, litigation materials, contracts, correspondence, and administrative records. Law firms occupy a high-value position in the professional-services sector because they aggregate sensitive information belonging to many different clients, often across industries and jurisdictions. A breach at such an organization can therefore affect not only the firm’s own staff and operations but also third parties whose data was entrusted to the firm for legal representation. The firm’s reported revenue figure of $25.2 million, as cited in the group’s materials, places it among established regional practices, though that figure itself originates from the threat actor’s claim rather than an independent audit released in connection with the incident.

What data was at risk

The only data category named in the public record is “internal files” said to have been exfiltrated. No further inventory of file types, record counts, or specific categories has been released by the firm or confirmed by independent sources. Organizations of this kind typically maintain a range of sensitive material; the precise contents involved here remain unconfirmed. In general terms, law firms commonly hold:

• Client correspondence, pleadings, and case files
• Contracts, discovery materials, and privileged communications
• Employee personnel and payroll records
• Billing, accounting, and administrative documents
• Contact details and identifying information of clients and opposing parties

Because the exact files taken have not been itemized publicly, it is not possible to state which of these categories, if any, were included. Readers should treat any claim of specific document exposure as unconfirmed unless the firm later publishes a detailed notice.

The real-world impact

For individuals whose information may have been among the internal files, the primary risks are misuse of personal or confidential data, potential identity-related fraud, and the possibility that privileged or sensitive legal matters could be exposed or leveraged. Even if the firm’s systems are restored, the mere fact that copies of files may now reside outside its control creates ongoing uncertainty. For the firm itself, consequences can include operational disruption, regulatory notification obligations under state and federal privacy rules, potential civil claims from clients, and reputational harm that affects client trust. Because the number of people affected is unknown and the data types remain only broadly described, the full scale of individual harm cannot yet be quantified. Clients and employees who later receive formal notice from the firm will have the clearest indication of whether their own records were involved.

What to do if you're exposed

If you are a client, employee, or other party who has shared information with Williams, Kastner & Gibbs PLLC, treat the listing as a reason for heightened caution rather than confirmed personal exposure. Practical first steps include monitoring financial and credit accounts for unusual activity, enabling multi-factor authentication on email and other critical services, and reviewing any formal breach notification the firm may issue. Preserve copies of correspondence with the firm in case questions arise later. You can also run a free exposure scan of your email address to check whether that address has already appeared in known breach datasets elsewhere; such a scan does not confirm or rule out involvement in this specific incident but can surface other exposures that warrant attention. If you receive phishing messages that reference the firm or legal matters, treat them skeptically and verify through known contact channels before responding.

AICompiled with AI assistance from public sources and published under our editorial standards.