APT_fnv1a_plus_extra_XOR_in_MSIL_experimental [yara]

This rule detects the specific MSIL implementation of fnv1a of the SUNBURST backdoor (standard fnv1a + one final XOR before RET) independent of the XOR-string. (fnv64a_offset and fnv64a_prime are standard constants in the fnv1a hashing algorithm.)