Was STC Concrete Product hit by ransomware?

STC Concrete Product was listed by the obscura ransomware operation (Thailand), 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 obscura ransomware group?

obscura 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 STC Concrete Product breach?

obscura published data attributed to STC Concrete Product. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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STC Concrete Product Public Company Limited

listed as STC Concrete Product · Claimed by Obscura · listed 6 months ago

Age

since listed · data leaked

Status timeline

ListedJan 11, 2026
Data leakeddate unknown

At a glance

Group: Obscura
Status: Data leaked
Country: Thailand
Sector: Construction
Listed on leak site: Jan 11, 2026

About the victim

AI dossier — public-source company profile

STC Concrete Product Public Company Limited (บริษัท เอสทีซี คอนกรีตโปรดัคท์ จำกัด (มหาชน)) is a publicly listed Thai manufacturer and distributor of precast concrete products, including ready-mixed concrete, precast floor slabs, concrete drainage pipes, prestressed concrete piles, and related products under the 'STC CONCRETE' trademark. Founded in 1988 and headquartered in Bang Lamung, Chonburi, the company claims the highest precast floor slab production capacity in Thailand's eastern region. Its products are manufactured under ISO 9001:2000 certification and Thai Industrial Standards (TIS).

Industry: Precast Concrete & Ready-Mixed Concrete Manufacturing
Address: 220/26 Moo 6, Sukhumvit Road, Na Kluea, Bang Lamung, Chonburi 20150, Thailand
Founded: 1988

Attack summary

Severity: medium — Data has been published (not merely listed), indicating confirmed exfiltration and disclosure; however, there is no stated volume, no confirmed regulated/sensitive personal data at scale (e.g., medical or government), and the leak post provides minimal detail, limiting severity to medium.

The ransomware group 'obscura' claims to have attacked STC Concrete Product Public Company Limited and has published data (disclosed status: data_published), though the leak post provides no detail on encryption, volume of exfiltrated data, or specific data categories beyond the company identification.

medium

Data the group says was taken

AI dossier — extracted from the leak post

Corporate business data
Investor relations documents
Financial statements
Annual reports (Form 56-1)
Board of directors evaluation records
Company policies and governance documents
Shareholder information
Internal communications

What the group claims

STC Concrete Product Public Company Limited engages in the manufacture and distribution of precast concrete products in Thailand.

Sources

Victim sitestc.co.th

Source

Indexed 6 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 obscura

Obscura is a recently emerged ransomware group that was first observed in September 2025, operating with apparent financial motivations based on their targeting patterns across multiple sectors and geographic regions. The group has compromised at least 33 known victims since their emergence, demonstrating rapid operational capabilities despite their recent entry into the ransomware landscape. Limited public documentation exists regarding their country of origin, operational structure, or affiliations with established ransomware families, though their targeting pattern suggests either opportunistic attacks or access to diverse initial compromise vectors. Their victim profile spans multiple sectors including healthcare, technology, manufacturing, and construction, with geographic focus on the United States, Malaysia, Portugal, Egypt, and Denmark, indicating either broad targeting criteria or access to varied attack infrastructure across different regions. Due to the group's recent emergence and limited public reporting from major security vendors and law enforcement agencies, specific details regarding their technical capabilities, encryption methods, data exfiltration practices, or ransom demands remain undocumented in open-source intelligence. The group appears to remain active as of late 2025, though insufficient time has elapsed to determine their long-term operational sustainability or potential law enforcement attention. The group has been linked to 33 public disclosures across our corpus. First observed on a leak site on September 5, 2025; most recent post January 11, 2026. The operation is currently active.

Timeline of this disclosure

January 11, 2026STC Concrete Product listed by obscuraon the group's public leak site

Other recent disclosures by obscura

obscura has been linked to 33 public victims on Darkfield. A sample of the most recent:

See the full obscura dossier →

Sector and geography

This disclosure adds to ransomware activity in the Construction sector, which has 988 disclosures indexed across all operators we track. Geographically, STC Concrete Product is reported in Thailand, a country with 63 ransomware disclosures in our corpus.

If your organisation is affected

A listing by obscura means STC Concrete Product 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.
Monitor for the data appearing on obscura'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.