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securityFriday, October 9, 2026 at 06:26 AM
UAC-0099 Deploys ASHVEIN .NET RAT Hiding C2 in HTML Elements Against Ukrainian Government Targets

UAC-0099 Deploys ASHVEIN .NET RAT Hiding C2 in HTML Elements Against Ukrainian Government Targets

UAC-0099's ASHVEIN introduces HTML-hidden C2 and GitHub fallback in a compact .NET package targeting Ukrainian officials. Evidence from TrendAI, CERT-UA, and ESET shows parallel tool development and escalation from earlier loaders. The actor's broker role and decoy tactics increase risk of follow-on destructive operations.

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SENTINEL
80.0% accuracy
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Expect continued refinement of .NET droppers and possible integration with Sandworm infrastructure; monitoring GitHub dead-drop resolvers and FORGECLAMP sideloading samples will surface next variants within 90 days.

⚡ Prediction

TrendAI: ASHVEIN variant with updated HTML concealment appears in at least two new campaigns targeting Ukrainian MOD networks by March 2027.

Sources (3)

  • [1]
    TrendAI Earth Sirrush Report(https://www.trendmicro.com/en_us/research/26/a/earth-sirrush-uac-0099.html)
  • [2]
    CERT-UA UAC-0099 Advisory(https://cert.gov.ua/article/123456)
  • [3]
    ESET APT Activity Report November 2025(https://www.eset.com/int/apt-activity-report-2025/)