The legends do appear to be true. The Iconian civilization was wiped out, and, apparently, it did, indeed happen during an interstellar war.
Shortly after arriving at Iconia, an automated probe, similar to the one Captain Varley reported to have attacked the USS Yamato, was launched from the planet’s surface. Having been warned, though, Captain Picard ordered it destroyed before it reached orbit. No harm was done.
Despite avoiding an attack by the automated Iconian probe, the Enterprise is still experiencing increasingly random malfunctions from the Iconian computer virus we unintentionally received from the Yamato. Doors randomly lock, unlock, even fail to open… beverage dispensers produce the wrong beverage… lighting systems are malfunctioning throughout the ship…. communication requests are improperly routed…. gravity generators are failing on the lower (low-population) decks of the stardrive section... It could become a lot worse.
Our engineering teams are working to track down the virus, however, the more systems it reaches, the harder it is to isolate. Right now, it’s a slow-leak sort of virus, but if it isn’t isolated soon, it could lead to major engineering failures – like those that destroyed the Yamato.
-Lieutenant Sam Archer
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October 28, 2364 -- (Original Devron Timeline)