Multifunctional nanoprobes for targeting, delivery and sensing have been highlighted due to their potential in revolutionizing understanding and treatment of diseases. While targeting functionality allows nanoprobes to reach specific, delivery function adding to nanoprobe allows on-demand drug releasing in a required cellular region. A further localization inside cells can be accomplished in sensing function. When nanoprobes are combined with selective optical antenna, it can provide enormous potential for molecular level imaging in living cells through electron absorption and vibration spectroscopic imaging. However, beside a difficulty of combining the two functions, nanoscale-fabrication, single-molecule sensitivity, and practical applications need to be resolved to realize optical antenna on nanoprobe. Highly organized viral structures are the one of nature's present. Even the simplest viruses have evolved the ability to enter cells, and to co-opt host cellular processes for replication. During the last century, these processes have been intensively studied to understand viral natural functions and to control viral diseases to human health and agriculture. More recently nano/biotechnology attempted to engineer viruses for approaching diagnostic/therapeutic applications. Here, for multifunctional nanoprobe, we demonstrate another promising paradigm of virus engineering by adding nanospectroscopic antenna on the highly ordered viral capsids. Used representative viruses are a simple but perfectly regular icosahedral, while their detail three dimensional structures increase plasmonic phenomena through thin metal layer imprinted on. An electromagnetic simulation study suggests a plasmonic virus more enhance localized and focused optical field near the particle than similar-sized smooth spheres, guaranteeing localized optical field based sensor applications. Through experiments for SERS and PRET, the viral particles were shown to increase the sensitivity by a factor of ∼106, compared to smooth spheres. Therefore, we believe this study increases potential for engineering viruses as resources for powerful research and medical applications involving molecular spectroscopy.