Was TCG hit by ransomware?

TCG was listed by the sinobi ransomware operation (United States), and stolen data was published on the group's leak site. Darkfield tracks this disclosure with the original leak post, screenshot and group context.

Who is the sinobi ransomware group?

sinobi is a ransomware operator tracked by Darkfield. See the full operator dossier for its known victims, sectors targeted, IOCs and leak-site infrastructure.

What data was leaked in the TCG breach?

sinobi published data attributed to TCG. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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TCG Inc

listed as TCG · Claimed by Sinobi · listed 7 months ago

Age

since listed · data leaked

Status timeline

ListedDec 8, 2025
Data leakeddate unknown

At a glance

Group: Sinobi
Status: Data leaked
Country: United States
Listed on leak site: Dec 8, 2025

About the victim

AI dossier — public-source company profile

TCG Inc provides specialized information technology and management advisory services exclusively to U.S. federal government agencies. The company's core competencies include Agile software development, federal shared services optimization, budget formulation and execution support, and health science analytics. It focuses on helping agencies modernize legacy systems, navigate federal procurement and compliance requirements, and address mission-critical operational challenges.

Industry: Federal IT & Management Advisory Services

Attack summary

Severity: critical — TCG Inc serves exclusively U.S. federal government agencies; exfiltrated data almost certainly includes sensitive government operational, financial, and health-related records, placing this in the critical tier due to the involvement of government-sector PII and mission-critical data at scale, with data confirmed published.

The ransomware group Sinobi claims to have published data exfiltrated from TCG Inc, with the disclosure status marked as data_published, indicating stolen data has been released. The nature of the exfiltrated data is not explicitly itemized in the post, but given TCG's federal government client base, it likely encompasses sensitive government advisory and operational records.

critical

Data the group says was taken

AI dossier — extracted from the leak post

Federal agency advisory records
Agile development project documentation
Budget formulation and execution data
Health science analytics data
Federal procurement and compliance documents
Mission-critical operational information

What the group claims

TCG Inc delivers specialized information technology and management advisory services to federal government agencies, combining technical expertise with deep understanding of public sector operations. The company focuses on four core competencies: Agile development methodologies, federal shared services optimization, budget formulation and execution support, and health science analytics. This multifaceted approach enables TCG to address complex challenges across diverse government missions. The company's service offerings reflect extensive experience navigating federal procurement, compliance requirements, and mission-critical operations. TCG's Agile development capabilities help agencies modernize legacy systems and accelerate software delivery cycles. In budget management, the firm provides advisory support for formulation processes and execution strategies, helping agencies optimize resource allocation and financial planning.

Sources

Leak posthttp://sinobi6ftrg27d6g4sjdt65malds6cfptlnjyw52rskakqjda6uvb7yd.onion/leaks/693582aa88b6823fa25d539c

Source

Indexed 7 months ago

This page surfaces a public ransomware disclosure indexed by Darkfield. Original posts come from the operator's own leak site; we cross-check against ransomware.live, RansomLook and RansomWatch where applicable. Share this URL freely.

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Disclosure context

About sinobi

Based on the limited publicly available information, Sinobi appears to be a recently emerged ransomware operation first observed in July 2025, with financial motivations evidenced by their targeting of 268 victims across multiple sectors. The group's origin and specific affiliations remain undocumented in public threat intelligence reporting, and there is no confirmed information regarding whether they operate as a Ransomware-as-a-Service model or as an independent entity. Their attack methodology and technical capabilities have not been extensively documented by major security research organizations, though their targeting patterns suggest a broad opportunistic approach rather than highly selective operations. The group demonstrates a preference for targeting organizations in the United States, India, United Kingdom, Canada, and Italy, with a focus on manufacturing, healthcare, construction, and technology sectors, suggesting they may exploit common vulnerabilities across these industries rather than deploying sophisticated, sector-specific attack vectors. No major high-profile campaigns or significant law enforcement actions against Sinobi have been publicly reported by CISA, FBI, or established threat intelligence firms. Given the recent emergence timeline and lack of extensive public documentation, the group's current operational status and long-term trajectory remain unclear, though the substantial victim count suggests continued activity as of the last available reporting period. The group has been linked to 274 public disclosures across our corpus. First observed on a leak site on July 5, 2025; most recent post May 8, 2026. The operation is currently active.

Timeline of this disclosure

December 8, 2025TCG listed by sinobion the group's public leak site

Other recent disclosures by sinobi

sinobi has been linked to 274 public victims on Darkfield. A sample of the most recent:

See the full sinobi dossier →

Sector and geography

Geographically, TCG is reported in United States, a country with 11,033 ransomware disclosures in our corpus.

If your organisation is affected

A listing by sinobi means TCG appeared on a ransomware extortion site and data attributed to it has been published. If this is your organisation, or a supplier you depend on, the priority is to confirm the intrusion and contain it before the window to act closes.

Engage your incident-response team and preserve forensic evidence before remediating — do not wipe affected systems first.
Force a password reset and revoke active sessions for exposed accounts; rotate any credentials, API keys or certificates that may have been in the stolen data.
Assess regulatory notification duties (GDPR, NIS2, sector regulators) — many carry a 72-hour reporting clock from awareness.
Report the incident to your national CERT, CISA (United States), as required for your jurisdiction.
Monitor for the data appearing on sinobi's leak site and across paste and breach channels, and brief downstream partners who may be exposed through you.

How we know this. Darkfield monitors public ransomware leak sites continuously, archiving every new disclosure and the data later released against the victim. Each entry on this page is sourced from the operator's own publication and cross-checked against complementary OSINT feeds (RansomLook, ransomware.live, RansomWatch). We do not collect or host stolen data — only the metadata, timestamps and screenshots needed to make the public disclosure searchable and accountable. Records here are corrected when the original post is edited, retracted, or merged with another disclosure.