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Ransomware Victim Construction

Jesin Group

Ransomware attack by Lamashtu · Disclosed April 20, 2026 · 🇲🇾 Malaysia

jesin.com.my

Date Disclosed
Apr 20, 2026
2026
Threat Group
Lamashtu
34 total victims
Country
🇲🇾 Malaysia
Industry
Construction

ThreatAI Analysis

Compiled from this incident record and the threat intelligence profile for Lamashtu. Figures and technique mappings are quoted from the source data, not inferred.

About the Lamashtu group

Lamashtu is an extortion group that first appeared in April 2026, claiming attacks against organizations in France, Romania, and Thailand across energy, pharmaceutical, and film sectors; it has not yet been confirmed as operating actual file-encrypting ransomware rather than pure data-theft extortion. Lamashtu has listed 34 victims since April 2026.

Incident Analysis

Jesin Group was targeted by Lamashtu ransomware, one of the most active ransomware groups in our database with 34 confirmed victims globally. The attack was disclosed on April 20, 2026, when Jesin Group appeared on the group's dark web leak site.

Jesin Group is based in Malaysia , operating in the Construction sector. Malaysia ranks #24 globally for ransomware attacks, with 128 victims in our database.

Sector context: Construction firms often hold sensitive project data, client financials, and intellectual property. The industry's typically lean IT security teams can make them more vulnerable.

Lamashtu typically employs a double extortion model: first exfiltrating sensitive data from the victim's systems, then deploying ransomware to encrypt files. Victims face two simultaneous threats — paying to restore access and paying to prevent publication of stolen data. The group's leak site publishes victim names and exfiltrated data as leverage.

Data source: This incident record is sourced from public ransomware group leak site disclosures aggregated via the ransomware.live API. Disclosure date reflects when the victim was published on the leak site, which may differ from the initial date of compromise. This platform does not publish or link to stolen data. Last data update: Sep 14, 2026 20:00 UTC.

Frequently Asked Questions

Was Jesin Group attacked by ransomware?

Yes. Jesin Group was listed as a victim of the Lamashtu ransomware group on April 20, 2026. The organisation is based in Malaysia and operates in the Construction sector. The disclosure appeared on the group's dark web leak site.

Which ransomware group attacked Jesin Group?

Jesin Group was attacked by Lamashtu ransomware. Lamashtu is one of the most active ransomware groups, having claimed 34 victims globally. The group typically employs a double-extortion model: encrypting the victim's files and threatening to publish stolen data.

When did the Jesin Group ransomware attack occur?

The ransomware attack on Jesin Group was disclosed on April 20, 2026. This date reflects when the victim was published on the threat group's leak site, which may differ from the actual date of initial compromise.

What data was stolen in the Jesin Group ransomware attack?

The specific data stolen from Jesin Group has not been independently verified by this platform. Ransomware groups typically exfiltrate data before encrypting systems and use the threat of publication to pressure victims. As a Construction organisation, Jesin Group likely held sensitive business data, client information, and operational records.

How can organisations protect against Lamashtu attacks?

To defend against Lamashtu and similar threat actors, organisations should: maintain regular offline backups tested for restoration; implement network segmentation to limit lateral movement; deploy multi-factor authentication on all remote access; use endpoint detection and response (EDR) tools; conduct regular phishing and security awareness training; and monitor threat intelligence feeds for indicators of compromise (IOCs) associated with active groups.