Infostealers and self-compiling droppers set loose by an unusual spam campaign
released on 2020-02-03 @ 04:06:51 PM
Thanks to massive botnets, attackers can generate large-scale spam campaigns on-demand and immediately use them to spread malware. While digging through some recent spam campaigns that we have detected, it came to our attention that there was some unexpected usage of the C# compiler from the command line, as reported by our sandbox analysis (shown in Figure 1).