ESET researchers discovered that a previously unknown backdoor, MythicRatatoskr, was deployed in an intrusion that later ...

ESET researchers identified new data-wiping malware that ESET named DynoWiper, used against an energy company in Poland. The TTPs observed during the DynoWiper incident closely resemble those seen ...

IntroductionCyberattacks against Ukraine are no longer the work of a single group acting alone. ESET's investigation has ...

Poland’s power system has just become the latest front line in a grinding cyber conflict that has been building since the first Russian tanks rolled into Ukraine. A destructive wiper attack on the ...

ESET researchers uncover MythicRatatoskr – a previously unknown Go-based backdoor hiding its C&C server inside the Yggdrasil ...

Sandworm wiped a Ukrainian logistics firm in September 2025 after UAC-0099 gained access and deployed a new Yggdrasil-based backdoor.

Russian state-sponsored threat group Sandworm deployed attacks involving malicious Microsoft Key Management Service activators and bogus Windows updates against Ukrainian Windows users since late 2023 ...

The Sandworm Russian military cyber-espionage group is targeting Windows users in Ukraine with trojanized Microsoft Key Management Service (KMS) activators and fake Windows updates. These attacks ...

Polish Prime Minister Donald Tusk on Jan. 15, at a press conference where he first detailed late 2025 Russian cyberattacks targeting his country's power grid. (Image: Polish government) Russian ...

Russia was probably behind the failed attempts to compromise the systems of Poland's power companies in December, cybersecurity researchers claim.… ESET attributed the attack with "medium" confidence ...