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Posted by Arnold Osipov on June 2, 2020

Ursnif/Gozi Introduction:

Morphisec has been tracking an uptick in the delivery of Ursnif/Gozi during the COVID-19 pandemic. Specifically, we have noticed a significant spike both in numbers and sophistication. The latest delivery methods will many times involve old-school Excel 4.0 macro functionality, which historically is a blind spot for AV detection as it has nothing to do with the VBA macro engine and is integrated as part of the workbook. INQUEST reported the use of similar techniques as part of a Zloader delivery campaign. Interestingly, in the latest campaign, it looks like the malware writers removed the image from the Excel document to avoid OCR heuristic detection following the INQUEST article.

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