In the context of a customer project, we examined a new variant of the Locky ransomware. As in the meantime stated by a law enforcement agency, this has been part of a large wave of attacks hitting various enterprises in the night from Tuesday (2016-07-26) to Wednesday.
As an initial attack vector, the attackers use emails with an attachment that probably even uses a 0day exploit, that enables the payload to be executed already when displayed in the MS Outlook preview.
The ransomware encrypts accessible documents and threatens victims to pay a ransom in order to be able decrypt the files. Further, the malware uses accessible network shares/drives for further spreading.
Further information is following in the next section.
It might help to create filtering rules based on the mentioned file names, hash values, URLs, and IP addresses that are named in the rest of this report.
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