Disclosure context

About securotrop

Securotrop is a relatively new ransomware group that emerged in July 2025 and operates with apparent financial motivations, having targeted at least 31 victims across multiple sectors. The group primarily targets English-speaking countries including the United States, Canada, and the United Kingdom, with their attacks focused heavily on manufacturing companies, business services firms, construction organizations, and telecommunications providers. Due to the group's recent emergence and limited public documentation from major cybersecurity agencies and researchers, specific details about their country of origin, operational structure, attack methodologies, and technical capabilities remain largely undocumented in open-source intelligence reports. The targeting pattern suggests a focus on critical infrastructure and industrial sectors that may be willing to pay ransoms to quickly restore operations, though no major high-profile attacks or record ransom demands have been publicly reported by established threat intelligence sources. Given the group's recent formation in mid-2025, Securotrop appears to remain active, though comprehensive analysis of their tactics, techniques, and procedures awaits further documentation by cybersecurity researchers and law enforcement agencies. The group has been linked to 35 public disclosures across our corpus. First observed on a leak site on July 22, 2025; most recent post May 4, 2026. The operation is currently active.

Timeline of this disclosure

May 4, 2026Thompson Builders Corporation listed by securotropon the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Construction sector, which has 415 disclosures indexed across all operators we track. Geographically, Thompson Builders Corporation is reported in US, a country with 2,713 ransomware disclosures in our corpus.

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.

Ransomware victim disclosure

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Thompson Builders Corporation

Claimed by securotrop · listed 16 days ago

16d

Age

since listed · data leaked

Status timeline

Listed
May 4, 2026
Data leaked

At a glance

Group: securotrop
Status: Data leaked
Country: US
Sector: Construction
Listed on leak site: May 4, 2026

About the victim

AI dossier — public-source company profile

Thompson Builders Corporation (TBC) is a Bay Area-based general contractor serving California since 1989. The company specializes in design/build, lease-leaseback, general contracting, pre-construction, and value engineering services for public and private sector clients. It has completed over 200 large-scale commercial and civil projects with a cumulative contract value exceeding $2 billion.

Industry: Commercial & Civil General Contracting
Address: Bay Area, California, US
Founded: 1989

Attack summary

Severity: high — 3,633 GB of confirmed exfiltrated data from a major general contractor with public-sector clients represents a significant volume of potentially sensitive business, financial, and project data; public agency client data may include regulated records, warranting a high severity rating.

The group 'securotrop' claims to have exfiltrated approximately 3,633 GB of data from Thompson Builders Corporation, with the post status listed as 'AWAITING', suggesting data has been published or is staged for release pending a response. No ransom amount was stated.

high

Data the group says was taken

AI dossier — extracted from the leak post

Project documents and contracts
Financial records
Subcontractor and supplier information
Employee records
Client/public agency data
Design and engineering files

What the group claims

Status: AWAITING Size: 3633 GB

Sources

Victim sitewww.tbcorp.com
Leak posthttp://securo45z554mw7rgrt7wcgv5eenj2xmxyrsdj3fcjsvindu63s4bsid.onion

Source

Indexed 16 days 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.