BrushaLoader is one of a growing group of downloaders frequently employed by threat actors to profile infected PCs and then load more robust payloads on devices of interest. Malware like BrushaLoader contributes to the ongoing trend of “quality over quantity” infections and enables threat actors to better stay under the radar than they can with highly disruptive infections like ransomware or when distributing massive malicious spam campaigns with high-profile malware as their primary payload. At the same time, these loaders can also deliver those same disruptive infections if threat actors choose to load ransomware as secondary payloads, a scenario ProofPoint have observed on multiple occasions recently.

REFERENCE:
https://www.proofpoint.com/us/threat-insight/post/brushaloader-still-sweeping-victims-one-year-later
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