Cybercriminals are abusing the Yandex.Direct online advertising service in order to serve up malicious ads that target Russian accountants with the goal of infecting them with banking trojans and ransomware.

Researchers from ESET have so far linked six malware programs to this campaign, which began in October and continues to this day. During periods of active distribution, these malware programs were hosted on two different GitHub repositories. When the campaign was dormant, the repositories would instead host harmless files. At times the malware files were signed with multiple code-signing certificates; other times, the attackers didn't bother or used invalid signatures.

Particularly noteworthy among the half-dozen malware programs was a previously undiscovered ransomware program identified as Win32/Filecoder.Buhtrap. Buhtrap is a cybercriminal group known to attack banks and the financial sector, and this apparently could be one of its newer weapons.

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