Within the past several months, FireEye has observed financially-motivated threat actors employ tactics that focus on disrupting business processes by deploying ransomware in mass throughout a victim’s environment. Understanding that normal business processes are critical to organizational success, these ransomware campaigns have been accompanied with multi-million dollar ransom amounts. In this post, we’ll provide a technical examination of one recent campaign that stems back to a technique that we initially reported on in April 2018.
Between May and September 2019, FireEye responded to multiple incidents involving a financially-motivated threat actor who leveraged compromised web infrastructure to establish an initial foothold in victim environments. This activity bared consistencies with a fake browser update campaign first identified in April 2018 – now tracked by FireEye as FakeUpdates. In this newer campaign, the threat actors leveraged victim systems to deploy malware such as Dridex or NetSupport, and multiple post-exploitation frameworks. The threat actors’ ultimate goal in some cases was to ransom systems in mass with BitPaymer or DoppelPaymer ransomware (see Figure 1).