This malware is a Go written variant of Micropsia and according to DeepInstinct it is still in development.
Mantis: New Tooling Used in Attacks Against Palestinian Targets
Arid Gopher Micropsia
What does Go-written malware look like? Here's a sample under the microscope
What is Arid Gopher? An Analysis of a New, Never-Before-Seen Malware Variant
Arid Gopher AridHelper
There is no Yara-Signature yet.