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Cyber Threat
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Ransomware victim Government & Defense

City of Fort Smith Arkansas

Listed by Interlock on · organisation based in United States

fortsmithar.gov

Disclosed
Sep 15, 2026
Leak-site listing date
Threat group
Interlock
145 victims listed
Country
United States
#1 most targeted
Sector
Government & Defense

ThreatAI analysis

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

About the Interlock group

Interlock is a ransomware group first observed in September 2024 that targets critical infrastructure sectors including healthcare, government, education, and technology across North America and Europe using double-extortion, with 57+ claimed victims including a major US dialysis provider exposing over two million patient records. Interlock has listed 132 victims since December 2023.

Vulnerabilities Interlock is recorded exploiting

1 of these 1 are in the CISA Known Exploited Vulnerabilities catalog, 1 of them recorded by CISA as used in ransomware campaigns. CVEs attributed to Interlock across its reported activity. There is no indication that any of these was involved in the City of Fort Smith Arkansas incident — the source data does not record an entry point.

Incident analysis

City of Fort Smith Arkansas was listed by Interlock ransomware, a group with 145 victims recorded in this database. The listing appeared on the group's leak site on September 15, 2026.

City of Fort Smith Arkansas is based in United States and operates in the Government & Defense sector. United States ranks #1 worldwide for ransomware disclosures, with 10,292 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.

Interlock 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files are encrypted, so the victim faces two demands at once — pay to restore access, and pay to keep stolen data unpublished.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 City of Fort Smith Arkansas attacked by ransomware?

Yes. City of Fort Smith Arkansas was listed as a victim of the Interlock ransomware group on September 15, 2026. The organisation is based in United States and operates in the Government & Defense sector. The disclosure appeared on the group's dark web leak site.

Which ransomware group attacked City of Fort Smith Arkansas?

City of Fort Smith Arkansas was attacked by Interlock ransomware. Interlock is one of the most active ransomware groups, having claimed 145 victims globally. The group typically employs a double-extortion model: encrypting the victim's files and threatening to publish stolen data.

When did the City of Fort Smith Arkansas ransomware attack occur?

The ransomware attack on City of Fort Smith Arkansas was disclosed on September 15, 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 City of Fort Smith Arkansas ransomware attack?

The specific data stolen from City of Fort Smith Arkansas 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 Government & Defense organisation, City of Fort Smith Arkansas likely held sensitive business data, client information, and operational records.

How can organisations protect against Interlock attacks?

To defend against Interlock 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.