** Shares of cybersecurity exchange firm WhiteHawk WHK.AX
rise as much as 31.8% to A$0.029, set for their best day since
July 28. 2020, if current gains hold
** Stock hits highest level since Sept. 21
** Co says won new contract that offers additional annual
revenue of $1.2 mln on an existing agreement for cyber risk
services with "top" five global social media companies
** About 1.5 mln shares change hands, compared with the
30-day average volume of 424,822
** Stock down ~67% this year, as of last close
(Reporting by Sneha Kumar)
((Sneha.Kumar@thomsonreuters.com;))