VERY IMPORTANT

Shell Crew, first named by RSA, has been incredibly proficient over time and breached numerous high-value targets. The backdoor provided an alternative foothold in several observed instances for the group and employed a few tricks like using the Intel SSE extended instruction set to avoid emulation and obscure analysis. The StreamEx family has the ability to access and modify the user’s file system, modify the registry, create system services, enumerate process and system information, enumerate network resources and drive types, scan for security tools such as firewall products and antivirus products, change browser security settings, and remotely execute commands. The malware documented in this post was predominantly 64-bit, however, there are 32-bit versions of the malware in the wild.