Dridex Downloader Tries New Sandbox-Evasion Techniques

Dridex is currently one of the most active and widespread banking malwares. Like Locky ransomware also Dridex is dispatched through a massive spam mail campaign that uses the Necurs botnet. Our sensors have long been tracking these spam campaigns and recent captured emails contain a Word document that drops Dridex. In our latest samples we have observed a delay on execution of the downloader stage that wasn’t present before, we have further investigated to figure out whether Dridex’s authors were experimenting with new, even if basic, anti-sandbox techniques.

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Analysis of an Undetected Dridex Sample

Analysis of an Undetected Dridex Sample

On the 4th of August one of our customers reported an infection attempt on one of their machines. In their deployment ReaQta-core is used to augment the security of their signature-based enterprise endpoint protection system, so an infection attempt detected by our solution is a sign that the AV missed the threat. Usually this either means that the attack is targeted or that the malware is brand new, let’s find out together the result of our investigation.
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