Kasimierz L

Profile narrative

Kasimierz L is an alias used by a threat actor known to operate from Poland. The actor has been observed working in conjunction with another individual who goes by the handle Kapustkiy. Public reporting identifies Kasimierz L as one of the two individuals responsible for a breach of the Argentinian Ministry of Industry website in December 2016. The collaboration between the two actors was described in the source material as a joint effort to gain access to the target, with both individuals participating in the intrusion.

The target of the operation was the official website of the Ministerio de Produccion in Argentina, a government sector entity. By obtaining access to an administrator account through a weak password, the pair were able to enter the site’s admin panel and download files stored on the ministry’s servers. This access exposed personal information such as names, home addresses, email addresses, social media profiles and phone numbers for roughly eighteen thousand individuals. The actors stated that they did not intend to leak the obtained data, and the ministry was notified of the incident although no public response was recorded at the time of reporting. An update noted that the login link was down, indicating the security team was working to fix the breach, possibly by taking down the admin panel or employing IP filters to block external access. No evidence of data leakage or public release of the information was presented in the reporting, and the actors claimed they would not disclose the compromised details.

The reported tactics centered on credential compromise rather than the use of malware or custom tooling. No specific malware families, exploit frameworks or tool suites are mentioned in the source material. Attribution to state sponsors or criminal groups has not been established in public sources. The Argentinian Ministry breach remains the sole publicly documented operation associated with Kasimierz L, serving as the representative example of the actor’s activity. This concludes the factual profile based solely on the provided source material.

Incidents

Attributed incidents are available to members.