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New pro-Ukraine hacker group targets Russian companies with custom ransomware

September 2, 2026 · The Record · Severity: CRITICAL

The group, which calls itself VantaCore, has targeted at least seven known victims, Russian cybersecurity firm F6 said in a report published this week.

Key Takeaways

  • VantaCore is a new pro-Ukraine hacker group using custom ransomware against Russian companies.
  • At least seven Russian companies have been targeted, according to cybersecurity firm F6's report.
  • The group's emergence underscores continued cyber warfare linked to the Ukraine conflict.
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