A report released today dives deep into technical aspects of a Linux
   backdoor now tracked as Bvp47 that is linked to the Equation Group, the
   advanced persistent threat actor tied to the U.S. National Security
   Agency.
Bvp47 survived until today almost undetected, despite being submitted to the Vir
us Total antivirus database for the first time close to a decade ago, in late 20
13.

[1]https://www.bleepingcomputer.com/news/security/nsa-linked-bvp47-linux-backdoo
r-widely-undetected-for-10-years/

References

   1. https://www.bleepingcomputer.com/news/security/nsa-linked-bvp47-linux-backdoor-widely-undetected-for-10-years/