MSK Listed by SilentRansomGroup Ransomware Group: Ransomware Claim — What’s Alleged & What To Do

On November 25, 2025, the ransomware group SilentRansomGroup listed Mitchell Silberberg & Knupp (MSK) on its leak site. The listing states that internal files were exfiltrated during a ransomware attack. The number of individuals affected remains unknown, and no further details on the volume or contents of the data have been made public. This incident occurs amid ongoing ransomware activity that frequently targets professional-services organizations. Such listings on leak sites are one mechanism groups use to pressure victims after data is removed from networks.

Breaking down the breach

The only confirmed information is the date the listing appeared and the group’s assertion that internal files were taken. No timeline for the intrusion, no count of affected records, and no description of the attack method have been released. The organization has not issued a public statement confirming or denying the claims.

The group behind it: SilentRansomGroup

SilentRansomGroup is a ransomware operator that maintains a public leak site where it posts names of organizations it claims to have targeted. The group’s typical pattern involves gaining access to corporate networks, copying data, and then encrypting systems before demanding payment. When payment is not received, the group publishes samples or directories of stolen material on its site. The listing of MSK follows this established pattern, but the group’s statements about any specific victim remain unverified claims until independently confirmed.

About MSK

Mitchell Silberberg & Knupp was established in 1908 and operates as a law firm providing legal and related professional services. Organizations of this type routinely store client correspondence, contracts, financial records, and internal administrative documents. A compromise at such a firm can expose information belonging to multiple clients across different industries.

The information in question

The listing refers only to “internal files exfiltrated in ransomware attack.” No inventory of file types, client names, or specific data categories has been published. While law firms commonly hold personal identifiers, privileged communications, and business records, the precise contents of the material claimed in this case have not been disclosed.

Why it matters

Exposure of internal legal files can create downstream risks for clients whose matters are referenced in those documents. Individuals may face increased chances of identity misuse or targeted scams if personal details appear in the material. For the firm, the incident adds operational costs related to investigation, potential regulatory notifications, and client communications, regardless of whether ransom demands were met.

If your data was in this claimed breach

Monitor financial accounts and credit reports for unusual activity. Enable multi-factor authentication on any services that may hold related information. Review privacy settings on professional or client portals connected to the firm. Individuals can also run a free exposure scan of their email address against known breach data to check for prior appearances of their information in public listings.

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