A number of Ukrainian power companies are seeing fresh cyberattacks following ones in December that briefly knocked out power for tens of thousands of customers.

Security vendor Eset said on Wednesday that the attacks use a different kind of malware, prompting questions about whether the same group or groups are involved.

“The malware is based on a freely available open-source backdoor – something no one would expect from an alleged state-sponsored malware operator,” wrote Robert Lipovsky, a senior malware researcher with Eset.

The new finding deepens the mystery over who is targeting the Ukrainian companies.

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