Cyber Threat Intelligence
CTI Academy Sponsor CTI Academy
PE
Ransomware Victim Energy & Utilities

Pertamina

Ransomware attack by Ransomhouse · Disclosed September 17, 2026 · 🇮🇩 Indonesia

www.pertamina.com

Date Disclosed
Sep 17, 2026
2026
Threat Group
Ransomhouse
150 total victims
Country
🇮🇩 Indonesia
Industry
Energy & Utilities

ThreatAI Analysis

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

Ransomhouse listed Indonesian energy firm Pertamina on its dark web leak site on 17 September 2026. Pertamina is involved in oil and gas operations, providing services for new and renewable energy and related activities.

About Pertamina

Pertamina is an energy company primarily in the oil and gas sector. The company provides services for new and renewable energy, and other activities related to or supporting business activities in energy.

Source record: ransomware.live

About the Ransomhouse group

RansomHouse is a double-extortion RaaS operation active since late 2021, attributed to the threat actor "Jolly Scorpius," targeting over 120 organizations across healthcare, finance, transportation, and government, recently upgrading to a multi-layered dual-key encryption architecture. Ransomhouse has listed 206 victims since June 2021.

Incident Analysis

Pertamina was targeted by Ransomhouse ransomware, one of the most active ransomware groups in our database with 150 confirmed victims globally. The attack was disclosed on September 17, 2026, when Pertamina appeared on the group's dark web leak site.

Pertamina is based in Indonesia , operating in the Energy & Utilities sector. Indonesia ranks #27 globally for ransomware attacks, with 121 victims in our database.

Sector context: Organisations in this sector hold valuable data and operational systems that ransomware groups seek to exploit for financial gain through encryption and data exfiltration.

Ransomhouse 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 18, 2026 12:00 UTC.

Frequently Asked Questions

Was Pertamina attacked by ransomware?

Yes. Pertamina was listed as a victim of the Ransomhouse ransomware group on September 17, 2026. The organisation is based in Indonesia and operates in the Energy & Utilities sector. The disclosure appeared on the group's dark web leak site.

Which ransomware group attacked Pertamina?

Pertamina was attacked by Ransomhouse ransomware. Ransomhouse is one of the most active ransomware groups, having claimed 150 victims globally. The group typically employs a double-extortion model: encrypting the victim's files and threatening to publish stolen data.

When did the Pertamina ransomware attack occur?

The ransomware attack on Pertamina was disclosed on September 17, 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 Pertamina ransomware attack?

The specific data stolen from Pertamina 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 Energy & Utilities organisation, Pertamina likely held sensitive business data, client information, and operational records.

How can organisations protect against Ransomhouse attacks?

To defend against Ransomhouse 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.