Tellow was a Wadi trader.
In 2376, Tellow visited Deep Space 9 and sold Quark computer texts that secretly had Luaran's sonic bullet nanite program hidden within the program files. The USS da Vinci crew pursued Tellow to the Kar-telos star system, where they apprehended him and forced him to reveal who he was working for. (SCE eBook: Malefictorum)