A Nasty Trick: From Credential Theft Malware to Business Disruption


Userlevel 7
Badge +48
January 10, 2019 | by Kimberly Goody, Jeremy Kennelly, Jaideep Natu, Christopher Glyer

FireEye is tracking a set of financially-motivated activity referred to as TEMP.MixMaster that involves the interactive deployment of Ryuk ransomware following TrickBot malware infections. These operations have been active since at least December 2017, with a notable uptick in the latter half of 2018, and have proven to be highly successful at soliciting large ransom payments from victim organizations. In multiple incidents, rather than relying solely on built-in TrickBot capabilities, TEMP.MixMaster used EMPIRE and RDP connections to enable lateral movement within victim environments. Interactive deployment of ransomware, such as this, allows an attacker to perform valuable reconnaissance within the victim network and identify critical systems to maximize their disruption to business operations, ultimately increasing the likelihood an organization will pay the demanded ransom. These operations have reportedly netted about $3.7 million in current BTC value.

Notably, while there have been numerous reports attributing Ryuk malware to North Korea, FireEye has not found evidence of this during our investigations. This narrative appears to be driven by code similarities between Ryuk and Hermes, a ransomware that has been used by APT38. However, these code similarities are insufficient to conclude North Korea is behind Ryuk attacks, as the Hermes ransomware kit was also advertised for sale in the underground community at one time.

Full Article.

0 replies

Be the first to reply!

Reply

    Cookie policy

    We use cookies to enhance and personalize your experience. If you accept or continue browsing you agree to our cookie policy. Learn more about our cookies.

    Accept cookies Cookie settings