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Solar says attackers it attributes to the Belarusian Cyber Partisans had access to an unnamed Russian healthcare organization from early 2024 until the intrusion was discovered in December 2025. The organization’s systems were not reported as disrupted or destroyed, but Solar said sensitive medical data was accessed. Public reporting does not establish how the attackers first got in, whether they copied data, or whether they reached any of the victim’s healthcare partners.
What happened, and when was it discovered?
According to Solar’s investigation, as reported by The Record on October 5, 2026, the earliest signs of compromise date to early 2024. Solar said it discovered the intrusion in December 2025, making the apparent access period nearly two years. The Record described Solar’s report as released the previous week; a technical report dates its publication to October 2, 2026.
Solar did not name the healthcare organization. The reporting describes it as having extensive infrastructure and connections to numerous other healthcare organizations. Those connections may have presented opportunities for further attacks, but there is no public confirmation that any connected organization was compromised.
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What did the attackers access?
Solar said the attackers accessed sensitive medical data. The public account does not specify the types of records, the number of records or patients affected, or whether information was exfiltrated. Access to data should not be treated as confirmation that it was copied or that a quantified patient-data breach occurred.
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The incident was not reported to have disrupted or destroyed the victim’s systems. Solar researchers offered a possible explanation for the quiet activity: “We believe the lack of destructive activity was linked to the value of maintaining this access for further espionage and trusted-relationship attacks.” That is Solar’s interpretation of motive, not a demonstrated account of the attackers’ intent.
A trusted-relationship attack uses access to one organization to try to reach another organization that trusts or is connected to it. Solar’s concern about the victim’s connections does not show that such a follow-on attack succeeded.
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What is known about the attribution?
Solar attributed the intrusion to the Belarusian Cyber Partisans. That attribution is Solar’s conclusion; the public reporting does not independently verify it or establish that the group acted at the direction of a government. The Cyber Partisans did not respond to The Record’s request for comment by publication.
The Record says the Cyber Partisans emerged after protests following Belarus’s disputed 2020 presidential election and have claimed responsibility for attacks on Belarusian government targets and, increasingly, Russian organizations. In July 2026, Russia’s Supreme Court designated the group an “extremist organization.” That is the court’s legal designation, not a neutral description; The Record reported it was the first time Russia applied the designation to a hacking group. In response to the ruling—not to the healthcare incident—the group said: “They can’t stop us, so they’re at least doing something to show they’re useful,” and “And we will keep destabilizing the dictatorship!”
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What tool did Solar report?
The Record identified Vasilek as one tool used in the intrusion. It describes Vasilek as a Windows backdoor that communicates with operators through Telegram. Reported capabilities include gathering information about an infected computer, running Windows commands, launching or terminating processes, moving files, capturing screenshots, recording keystrokes, and updating or deleting itself. Solar said the version it examined was newer than the version Kaspersky first documented in 2025.
Solar reportedly said restrictions on Telegram in Russia made communications less reliable, while noting that operators could switch communication methods. The reporting does not establish that Telegram was the attackers’ only channel or that the restrictions stopped the operation.
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How did the attackers get in—and what remains unknown?
The accessible reporting does not identify the initial access method. It therefore does not establish whether the intrusion began with phishing, exploitation of a software vulnerability, stolen credentials, or another route. Without that information, the account cannot explain how the attackers first entered or exactly how they maintained access for so long.
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- Victim identity: Solar has not publicly named the healthcare organization in the reporting.
- Data scope: Sensitive medical data was reportedly accessed, but its categories and scale are not stated.
- Exfiltration: The public account does not confirm whether data was copied out of the network.
- Related organizations: The victim had connections to other healthcare entities, but no compromise of those entities is confirmed.
- Entry method: The initial access vector is not stated.
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