Trojan.Downloader.Bredolab.CJ is an approximately 40kb piece of code with a high damage rate. Trojan.Downlolader.Cj is disguised in a word document in order to trick the users into downloading it into the computer. Once on the computer, it copies itself in %Programs%Startuprarype32.exe, deleting immediately afterwards the original file that generated the infection. This malicious code has two components: the packed main executable and a downloader that is always injected into other processes (including explorer.exe)”]
Source: https://www.bitdefender.com/blog/hotforsecurity/weekly-malware-review-trojan-downloader-bredolab-cj/