Disclosure context

About lamashtu

Based on the limited available information, Lamashtu is an emerging ransomware group that was first observed in April 2026, appearing to be financially motivated based on their operational patterns. The group's origin and potential affiliations remain unclear due to their recent emergence and limited public documentation by major threat intelligence organizations. Lamashtu's attack methodology and specific technical capabilities have not been extensively documented by established security researchers, though their targeting patterns suggest they employ standard ransomware deployment techniques across multiple industry verticals. The group has conducted at least 8 confirmed attacks, demonstrating a geographically diverse targeting approach with victims identified in France, Italy, the United States, Singapore, and Malaysia, while focusing primarily on business services, manufacturing, transportation and logistics, hospitality and tourism, and energy sectors. Given the group's recent first observation in April 2026 and limited public threat intelligence reporting from established sources like CISA, FBI, or major security firms, Lamashtu appears to represent a newly active threat actor whose current operational status and long-term capabilities require further monitoring and analysis. The group has been linked to 30 public disclosures across our corpus. First observed on a leak site on April 13, 2026; most recent post May 19, 2026. The operation is currently active.

Timeline of this disclosure

April 20, 2026Jesin Group listed by lamashtuon the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Not Found sector, which has 4,859 disclosures indexed across all operators we track. Geographically, Jesin Group is reported in MY, a country with 29 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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Jesin Group

Claimed by lamashtu · listed 1 month ago

30d

Age

since listed · data leaked

Status timeline

Listed
Apr 20, 2026
Data leaked

At a glance

Group: lamashtu
Status: Data leaked
Country: MY
Sector: Not Found
Listed on leak site: Apr 20, 2026

About the victim

AI dossier — public-source company profile

Jesin Group is one of Northern Malaysia's leading property developers, operating for over 50 years with a strong presence in the Kedah region. The company specialises in residential, commercial, and industrial real estate development, construction, and asset management. It has built approximately 2,967 properties across 360 acres and is a pioneer of the Industrialised Building System (IBS) in Malaysia.

Industry: Residential & Commercial Property Development
Address: No. 25, 26 & 27, Jalan Petani, 08000 Sungai Petani, Kedah Darul Aman, Malaysia

Attack summary

Severity: high — The status is 'data_published', meaning the group has already released stolen data publicly. As a property developer, this likely involves customer PII (buyers, financial records, contracts) and sensitive business data, constituting confirmed exfiltration with published proof.

The Lamashtu ransomware group claims an attack on Jesin Group with data published (disclosed status: data_published), though the leak post does not specify whether encryption, exfiltration, or both occurred, and no ransom amount or data volume is stated.

high

Data the group says was taken

AI dossier — extracted from the leak post

Corporate business data
Property development records
Customer information
Internal company files

What the group claims

Jesin Group is a prominent property developer in Northern Malaysia with over 50 years of experience, specializing in residential and commercial real estate development, construction, and asset management.

Sources

Victim sitejesin.com.my
Leak posthttp://lamashtux5j74mcm7lwwgn5yrvuwtrpxjoyendif3v3hrztjesfoyayd.onion/post/33b6727db6b8cd5e8d214d8ab4574368

Source

Indexed 1 month 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.