Office DDE feature exploited to deliver DNSMessenger payload in new targeted phishing campaign

The Research, Analysis, and Intelligence Division (R.A.I.D.) here at PhishLabs interacts with a multitude of malware samples in our day-to-day operations. Occasionally, we come across a campaign that stands out from the rest. One such instance occurred recently when one of our Phishing Threat Monitoring service clients was targeted with DNSMessenger, a sophisticated, memory-based infection technique, which has been previously associated with a financially-motivated Advanced Persistent Threat (APT) actor group. Also notable is the delivery method – the increasingly popular Dynamic Data Exchange (DDE) protocol Office document attack. This delivery method has recently been adopted by actors ranging from nation-state APTs to spammers peddling downloaders and ransomware. In this article, we will examine this delivery vector and dissect the initial DNSMessenger payload.

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