Disclosure context

About lockbit5

Based on the provided data, LockBit5 appears to be a recently emerged ransomware operation first observed in December 2025, representing what may be a new iteration or rebrand within the LockBit ransomware ecosystem, with primary financial motivations evidenced by their targeting of high-value sectors. Given the LockBit naming convention and the timing of emergence, this group likely operates from Eastern Europe or Russia and may represent either a continuation of previous LockBit operations or a new affiliate group leveraging the established LockBit brand, though specific organizational details remain undocumented by major security agencies. While detailed attack methodologies have not been publicly documented by CISA, FBI, or major security researchers, the group's targeting pattern across 157 victims suggests a broad-spectrum approach focusing on technology, manufacturing, healthcare, and transportation sectors primarily in the United States, Brazil, Germany, Italy, and Mexico. Due to the group's recent emergence in December 2025, there are no publicly documented notable campaigns or major incidents reported by established threat intelligence sources, though the victim count indicates active operations. The group appears to be currently active based on the recent first observation date, though comprehensive analysis from major security agencies has not yet been published given the short timeframe since emergence. The group has been linked to 252 public disclosures across our corpus. First observed on a leak site on December 7, 2025; most recent post May 12, 2026. The operation is currently active.

Timeline of this disclosure

May 1, 2026ritta.co.th listed by lockbit5on the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Business Services sector, which has 2,640 disclosures indexed across all operators we track. Geographically, ritta.co.th is reported in TH, a country with 45 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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ritta.co.th

Claimed by lockbit5 · listed 20 days ago

19d

Age

since listed · data leaked

Status timeline

Listed
May 1, 2026
Data leaked

At a glance

Group: lockbit5
Status: Data leaked
Country: TH
Sector: Business Services
Listed on leak site: May 1, 2026

About the victim

AI dossier — public-source company profile

RITTA (Ritta Co., Ltd.) is a leading design and construction service provider based in Thailand, employing in excess of 700 engineers and architects. The company undertakes a wide range of project types including condominiums, hospitals, hotels and resorts, factories, offices, and universities. It offers integrated services covering design and engineering, BIM, pricing, commercial licensing, and facility support.

Industry: Design & Construction Services
Address: Thailand (specific street address not stated on public site)
Employees: 700+

Attack summary

Severity: high — Data has been published (not merely listed), confirming exfiltration of significant business data from a sizeable construction firm with 700+ staff and major commercial clients; while no explicit regulated/PII-at-scale detail is confirmed, the published status and business scale elevate this to high.

LockBit 5 claims to have attacked RITTA and has published data (disclosed status: data_published), indicating exfiltration of company data; the specific data types and volume were not detailed in the truncated post.

high

Data the group says was taken

AI dossier — extracted from the leak post

Company internal data
Project documentation
Engineering and design files
Employee records (inferred)
Client/contract information (inferred)

What the group claims

RITTA is a leading design and construction service provider in Thailand, specializing in a wide rang...

Sources

Victim siteritta.co.th
Leak posthttp://lockbitapt67g6rwzjbcxnww5efpg4qok6vpfeth7wx3okj52ks4wtad.onion/post/3aade86bda787805044e87403ff2eebb

Source

Indexed 20 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.