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ESET Research: Sandworm behind cyberattack on Poland’s power grid in late 2025

ID: a28edf84-dc53-5bb3-a52b-414f00f80d3e

STIX ID: report--a28edf84-dc53-5bb3-a52b-414f00f80d3e

Feed Name: WeLiveSecurity (ESET Research)

Threat Score
85/100

Date Published: 2026-01-23

Date Updated: 2026-05-01

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ESET Research reports that a late-2025 coordinated cyberattack against Poland's power grid involved a data-wiping malware the researchers named DynoWiper (detected as Win32/KillFiles.NMO) and attributes the activity with medium confidence to the Russia-aligned Sandworm APT, providing analysis, TTP overlap with previous wiper attacks, and a SHA-1 IoC while noting no confirmed successful disruption.

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