Russian hackers hide Zebrocy malware in virtual disk images

silversurfer

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Aug 17, 2014
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Russian-speaking hackers behind Zebrocy malware have changed their technique for delivering malware to high-profile victims and started to pack the threats in Virtual Hard Drives (VHD) to avoid detection. [...]

Windows 10 supports VHD files natively and can mount them as external drives to allow users to view the files within. Last year, security researchers discovered [1, 2] that antivirus engines do not check VHD contents until the disk images are mounted.

Researchers at Intezer discovered at the end of November a VHD uploaded to the Virus Total scanning platform from Azerbaijan. Inside the image were a PDF file and an executable posing as a Microsoft Word document, which Zebrocy malware.
 

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