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Jesin Group

Claimed by Lamashtu · listed 3 months ago

2m
Age
since listed · data leaked

Status timeline

  1. ListedApr 20, 2026
  2. Data leakeddate unknown

At a glance

Group
Lamashtu
Status
Data leaked
Country
Malaysia
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

Source

Indexed 3 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 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 34 public disclosures across our corpus. First observed on a leak site on April 13, 2026; most recent post June 17, 2026. The operation is currently active.

Timeline of this disclosure

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

Other recent disclosures by lamashtu

lamashtu has been linked to 34 public victims on Darkfield. A sample of the most recent:

See the full lamashtu dossier →

Sector and geography

Geographically, Jesin Group is reported in Malaysia, a country with 40 ransomware disclosures in our corpus.

If your organisation is affected

A listing by lamashtu means Jesin Group 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 lamashtu'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.