The remainder of this section focuses largely on Object Linking and Embedding (OLE) Microsoft Excel documents, as they are most commonly used by the Hangover group, at least when it comes to the BackConfig malware. Through infrastructure analysis however, Unit 42 was able to find a BackConfig PE sample (SHA256: e28f1bc0b0910757b25b2146ad02798ee6b206a5fe66ce68a28f4ab1538d6a1f; first seen 10/24/2019) using the C2 domain matissues[.]com and dropped by the weaponised Rich Text Format (RTF) file (SHA256: 752c173555edb49a2e1f18141859f22e39155f33f78ea70a3fbe9e2599af3d3f) from the same day. The RTF used the CVE-2017-11882 exploit against equation editor vulnerabilities in Office applications to execute the PE sample which was a unique exploitation method compared to all other samples analyzed.