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Cyber Threat
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Ransomware victim Energy & Utilities

Pertamina

Listed by Ransomhouse on · organisation based in Indonesia

www.pertamina.com

Disclosed
Sep 17, 2026
Leak-site listing date
Threat group
Ransomhouse
159 victims listed
Country
Indonesia
#27 most targeted
Sector
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 212 victims since June 2021.

Incident analysis

Pertamina was listed by Ransomhouse ransomware, a group with 159 victims recorded in this database. The listing appeared on the group's leak site on September 17, 2026.

Pertamina is based in Indonesia and operates in the Energy & Utilities sector. Indonesia ranks #27 worldwide for ransomware disclosures, with 134 victims in this 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 follows a double extortion model: data is exfiltrated from the victim's systems before files are encrypted, so the victim faces two demands at once — pay to restore access, and pay to keep stolen data unpublished. The leak site, where this listing appeared, is the lever for the second demand.

Source. Public leak-site disclosures aggregated via the ransomware.live API. The disclosure date is when the listing was published, which can differ from the date of compromise. This site does not publish or link to stolen data. Last updated .

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 159 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.