Requiring the successful completion of a CAPTCHA means analysis will only happen when a live human being downloads the sample. Without the automation, the chances of the malicious file flying under the radar are much better. Microsoft has dubbed Chimborazo’s ongoing attack campaign Dudear.
CHIMBORAZO, the group behind Dudear campaigns that deploy the info-stealing Trojan GraceWire, evolved their methods once again in constant pursuit of detection evasion. The group is now using websites with CAPTCHA to avoid automated analysis. pic.twitter.com/Kz3cdwYDd7— Microsoft Security Intelligence (@MsftSecIntel) June 17, 2020