Uroburos is a rootkit, composed of two files, a driver and an encrypted virtual file system. Experts at the German security vendor G Data claims that Uroburos is a highly complex and very sophisticated malware, programmed by skilled people.
Read G Data Red Paper here – https://blog.gdatasoftware.com/blog/article/android-smartphone-shipped-with-spyware.html
Deeper travel into kernel protection mitigation – https://blog.gdatasoftware.com/blog/article/uroburos-deeper-travel-into-kernel-protection-mitigation.html