On November 9, 2018, we observed a relatively small email campaign (thousands of messages) delivering a new malware family that we call “ServHelper” based on file names associated with infection. The campaign primarily targeted financial institutions and was attributed to the threat actor TA505. The messages (Figure 1) contained Microsoft Word or Publisher attachments with macros that, when enabled, downloaded and executed the malware. This campaign used the “tunnel” variant of ServHelper, described in the “Malware Analysis” section