Bolivian Military Social Security Corporation – COSSMIL

Bolivian Military Social Security Corporation – COSSMIL was compromised in a ransomware attack attributed to kazu in November 2025. The organization, operating in an undisclosed sector in Unknown, was added to the group's data leak site as part of an extortion campaign.

kazu operates as a financially motivated ransomware-as-a-service (RaaS) operation, exfiltrating sensitive data and threatening public disclosure to pressure victims into paying ransom demands.

The website cossmil.mil.bo belongs to COSSMIL (Corporación del Seguro Social Militar), Bolivia’s Military Social Security Corporation. It is a government institution under the Ministry of Defense that provides healthcare and social security services to members of the Bolivian Armed Forces and their families.