Sinarmas Cepsa Pte. Ltd. Data Breach

Sinarmas Cepsa Pte. Ltd., a company operating within the industrial sector in Portugal and utilizing the domain ptesm[.]com, was listed on the Blackwater ransomware group’s leak site on August 24, 2026. This listing positions Sinarmas Cepsa Pte. Ltd. as a potential victim of data extortion. The industrial and energy-adjacent sector is a known area of interest for Blackwater, suggesting the company may have been targeted due to its industry profile, which aligns with the threat actor’s typical focus. Blackwater has claimed four victims within the preceding 60 days. The group primarily targets the Professional Services and Energy & Utilities sectors, with a significant operational presence in Portugal, alongside victims in India and Argentina. Portugal is noted as Blackwater’s most active geographic area for attacks. The targeting of Sinarmas Cepsa Pte. Ltd. aligns with the group’s established pattern of targeting Portuguese entities within its preferred sectors. Previous victims include Shalina, AMCA, and msgas, indicating a consistent operational strategy by Blackwater.

SOCRadar’s analysis of stealer-log telemetry for the domain ptesm[.]com did not yield any records within the queried dataset. It is crucial to note that this result does not constitute a clearance of compromise. The queried dataset represents a paginated sample and does not encompass all available threat intelligence feeds or account for credentials associated with personal email aliases. Furthermore, records may exist in other data sources not included in this specific query, or credentials may have been used and subsequently rotated by threat actors before being indexed. The absence of evidence in this particular log slice is not definitive proof of the absence of a compromise. The typical access vector employed by Blackwater involves sourcing credentials from infostealer logs acquired on underground markets. These credentials are then validated and used to gain access to systems, often through platforms such as Microsoft 365, VPNs, or remote access portals, before ransomware deployment. For an industrial sector entity like Sinarmas Cepsa Pte. Ltd., the credential surface likely includes both corporate email accounts and operational system access portals. Given Blackwater’s noted focus on Portuguese industrial targets, broader credential screening and monitoring are recommended. This includes continuous dark web monitoring, proactive credential hygiene checks, regular password rotation, and multi-factor authentication review for all access points.

This report is intended for threat intelligence and security awareness purposes. SOCRadar does not host, redistribute or buy stolen data. All breach information reported here is collected from publicly accessible threat actor and ransomware portals. This content is intended to equip CTI teams with context around recent attacks. While we strive for accuracy, listings on ransomware leak and extortion sites cannot always be independently verified and may not reflect confirmed breaches. If you believe any data in this report is incorrect, please contact us.