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Cyber Threat
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Ransomware victim Telecommunication

Netstar Australia PTY Ltd

Listed by Blackshrantac on · organisation based in Australia

netstar.com.au

Disclosed
Dec 17, 2025
Leak-site listing date
Threat group
Blackshrantac
43 victims listed
Country
Australia
#10 most targeted
Sector
Telecommunication

ThreatAI analysis

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

About the Blackshrantac group

BlackShrantac is a ransomware group that emerged in late 2025, targeting organizations in manufacturing, financial services, technology, and the public sector globally, employing double-extortion combined with living-off-the-land techniques to weaponize legitimate tools and disable defenses before encrypting files. Blackshrantac has listed 43 victims since September 2025.

Incident analysis

Netstar Australia PTY Ltd was listed by Blackshrantac ransomware, a group with 43 victims recorded in this database. The listing appeared on the group's leak site on December 17, 2025.

Netstar Australia PTY Ltd is based in Australia and operates in the Telecommunication sector. Australia ranks #10 worldwide for ransomware disclosures, with 420 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.

Blackshrantac 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files are encrypted, so the victim faces two demands at once — pay to restore access, and pay to keep stolen data unpublished.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 Netstar Australia PTY Ltd attacked by ransomware?

Yes. Netstar Australia PTY Ltd was listed as a victim of the Blackshrantac ransomware group on December 17, 2025. The organisation is based in Australia and operates in the Telecommunication sector. The disclosure appeared on the group's dark web leak site.

Which ransomware group attacked Netstar Australia PTY Ltd?

Netstar Australia PTY Ltd was attacked by Blackshrantac ransomware. Blackshrantac is one of the most active ransomware groups, having claimed 43 victims globally. The group typically employs a double-extortion model: encrypting the victim's files and threatening to publish stolen data.

When did the Netstar Australia PTY Ltd ransomware attack occur?

The ransomware attack on Netstar Australia PTY Ltd was disclosed on December 17, 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 Netstar Australia PTY Ltd ransomware attack?

The specific data stolen from Netstar Australia PTY Ltd 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 Telecommunication organisation, Netstar Australia PTY Ltd likely held sensitive business data, client information, and operational records.

How can organisations protect against Blackshrantac attacks?

To defend against Blackshrantac 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.