Plays a role in the inhibition of host RLR-induced interferon-beta activation by inhibiting the phosphorylation of TANK-binding kinase 1/TBK1, thereby blocking IRF3 activation and preventing the establishment of an antiviral state (PubMed:28848048, PubMed:28680969). Also blocks IFN-triggered nuclear translocation and activation of host STAT2 (PubMed:31040183, PubMed:28680969). Interacts with host TBK1; this interaction antagonizes TBK1 phosphorylation and inhibits TBK1-IRF3 interaction (PubMed:28848048, PubMed:28680969) (Probable). Interacts with host STAT2; this interaction blocks the nuclear translocation and activation of host STAT2 (PubMed:31040183). Interacts with host TNIP2 (PubMed:30617349). Belongs to the Bandavirus NS-S protein family.