Skip to content
Cyber Threat
CTI Academy Sponsor CTI Academy
Ransomware victim Technology

multi-media systeme AG (mmsag.de)

Listed by J on · organisation based in Germany

mmsag.de

Disclosed
Sep 30, 2025
Leak-site listing date
Threat group
J
41 victims listed
Country
Germany
#2 most targeted
Sector
Technology

ThreatAI analysis

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

About the J group

J is an emerging ransomware group that launched its leak site in May 2025, claiming over 41 victims by late 2025 including FAI Aviation Group (Germany), operating primarily as a leak-site-centric extortion identity with limited public technical analysis. J has listed 41 victims since February 2025.

Incident analysis

multi-media systeme AG (mmsag.de) was listed by J ransomware, a group with 41 victims recorded in this database. The listing appeared on the group's leak site on September 30, 2025.

multi-media systeme AG (mmsag.de) is based in Germany and operates in the Technology sector. Germany ranks #2 worldwide for ransomware disclosures, with 1,006 victims in this database.

Sector context. Technology companies hold intellectual property, customer data, and source code — all highly valuable assets. A successful ransomware attack can also put downstream customers at risk through supply chain exposure.

J 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files are encrypted, so the victim faces two demands at once — pay to restore access, and pay to keep stolen data unpublished.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 multi-media systeme AG (mmsag.de) attacked by ransomware?

Yes. multi-media systeme AG (mmsag.de) was listed as a victim of the J ransomware group on September 30, 2025. The organisation is based in Germany and operates in the Technology sector. The disclosure appeared on the group's dark web leak site.

Which ransomware group attacked multi-media systeme AG (mmsag.de)?

multi-media systeme AG (mmsag.de) was attacked by J ransomware. J is one of the most active ransomware groups, having claimed 41 victims globally. The group typically employs a double-extortion model: encrypting the victim's files and threatening to publish stolen data.

When did the multi-media systeme AG (mmsag.de) ransomware attack occur?

The ransomware attack on multi-media systeme AG (mmsag.de) was disclosed on September 30, 2025. 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 multi-media systeme AG (mmsag.de) ransomware attack?

The specific data stolen from multi-media systeme AG (mmsag.de) 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 Technology organisation, multi-media systeme AG (mmsag.de) likely held source code, intellectual property, and customer data.

How can organisations protect against J attacks?

To defend against J 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.