Disclosure context

About worldleaks

Based on the limited available data, worldleaks is a recently emerged ransomware group that was first observed in May 2025 and appears to be primarily financially motivated, having claimed 134 victims in a relatively short timeframe since its emergence. The group's origin and organizational structure remain unclear, with no publicly documented information from major cybersecurity firms or law enforcement agencies regarding their country of origin, potential affiliations, or operational model. Their targeting patterns indicate a focus on English-speaking countries, particularly the United States, United Kingdom, and Canada, with additional activity observed in Germany and Japan, while their sector targeting shows a preference for healthcare, technology, manufacturing, and consumer services organizations. Due to the group's recent emergence and limited public documentation by established threat intelligence sources, specific details about their attack methodologies, encryption techniques, extortion tactics, and notable campaigns have not yet been comprehensively analyzed or reported by organizations such as CISA, FBI, or major cybersecurity research firms. The group appears to remain active as of the most recent observations, though comprehensive threat intelligence profiling awaits further analysis and documentation by established cybersecurity authorities. The group has been linked to 155 public disclosures across our corpus. First observed on a leak site on May 18, 2025; most recent post May 12, 2026. The operation is currently active.

Timeline of this disclosure

March 27, 2026Leighton listed by worldleakson 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, Leighton is reported in United Kingdom, a country with 902 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

← All victims

Leighton

Claimed by worldleaks · listed 2 months ago

54d

Age

since listed · data leaked

Status timeline

Listed
Mar 27, 2026
Data leaked

At a glance

Group: worldleaks
Status: Data leaked
Country: United Kingdom
Sector: Construction
Listed on leak site: Mar 27, 2026

About the victim

AI dossier — public-source company profile

Leighton is a UK-based software development and digital transformation company headquartered in Newcastle, North East England. The company specialises in building custom software applications, automating business processes, and providing embedded technology experts to help organisations accelerate digital capabilities. It holds AWS Advanced Tier Partner status and employs over 100 AWS-certified professionals.

Industry: Software Development & Digital Transformation Services
Employees: 51-200

Attack summary

Severity: medium — Data is marked as published (data_published), indicating some form of confirmed disclosure, but the leak post provides no specifics on the nature, volume, or sensitivity of the data involved, and the threat actor's description of the victim is demonstrably inaccurate, reducing confidence in claimed impact.

The worldleaks group claims a data disclosure against Leighton, with the status recorded as data_published. The leak post's description of a multinational construction company appears to be AI-generated and misidentifies the victim; no specific data types, exfiltration volumes, or encryption claims are stated in the post.

medium

Data the group says was taken

AI dossier — extracted from the leak post

Unspecified published data

Original description

AI-summarised, not from the leak post

Leighton is a multinational construction company, based in Australia, known for undertaking major construction, infrastructure, telecommunications and engineering works around the world. It was previously known as Leighton Contractors, prior to its rebranding as CIMIC Group in 2015. Some of its notable projects include large-scale building, infrastructure, and civil & mining projects globally.

Sources

Victim sitewww.leighton.com
Leak posthttps://worldleaksartrjm3c6vasllvgacbi5u3mgzkluehrzhk2jz4taufuid.onion/companies/1504221778

Source

Indexed 2 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.