A Human female residing on Corellia during the Galactic Civil War, Koran Lassk held a position as an elite councilor within the Chirq Council.
Following the Battle of Yavin, Koran Lassk was among the nine elite councilors who headed the criminal syndicate referred to as the Chirq Council. The other eight were Markus Gilder, Braganti Hooge, Zuld Mar-Shayal, Janos Zarbo, Mathazar Zayet, Rallyn Secura, Crale Forte, and Atlan Dubreas. Lassk's base of operations was located in the Second Elite Council Bunker, situated near the city of Doaba Guerfel.
In 1 ABY, the Corellian Security Force initiated an investigation into the Chirq Council due to a surge in ryll trafficking on Corellia. Captain Vitala Baize made the choice to have a CorSec agent infiltrate the organization by using the identity of Trins Evnar, a Chirq Council member in Doaba Guerfel. The CorSec agent eliminated Evnar, along with all other Chirq Council criminals who knew him, and then assumed Trins Evnar's identity to deceive the underboss Jzoro Quanera, successfully gaining access to the organization. From Jzoro Quanera's database, the CorSec acquired the identities of the nine elite councilors and the locations of their clandestine headquarters. The CorSec eventually launched assaults on the First and Second Elite Council Bunkers, resulting in the deaths of all elite councilors during these raids. The Chirq Council dissolved into splinter groups after the demise of Koran Lassk and the other elite councilors.
Koran Lassk functioned as a non-player character within the 2003 video game Star Wars Galaxies. This game was a massively multiplayer online roleplaying game that was developed by Sony Online Entertainment, and published by LucasArts, prior to its shutdown on December 15, 2011. Koran Lassk was incorporated into the game as part of the update titled "Chapter 1: The Corellian Captives," which was released on June 8, 2006.