Targets of the operation were given phony coding challenges that delivered a range of malware including a previously-unseen backdoor.

The work has been carried out by a newly identified group dubbed "MustachedBouncer," according to researchers with ESET.

Researches believe the destructive malware is the work of Sandworm, a Russian military unit suspected in a series of Ukrainian cyberattacks.

Active since 2020, the cyberespionage group has targeted a range or mostly Asian public and private entities.

Dragos says the group behind the tools has a "breadth of knowledge" that's "beyond" any previously witnessed.

Russian losses near Kyiv and a looming onslaught in eastern Ukraine may be a factor in the attack, a Ukrainian official said.

Ukraine's Victor Zhora said the so-called IT Army has done "useful" things, and he offered information about the "CaddyWiper" incident.

The wiper could add to the woes of a country increasingly under physical and cyber assault.

Ukraine is more explicitly blaming Russia for the cyberattacks.

ESET said it discovered the group, which has been active since 2019.