BUZZ-Petrobras SA: Appoints executive to monitor corruption
** U.S.-listed shares of Brazil's state-run oil company up 3 pct at $10.71 premarket
** Board approves creation of new role of Executive Director of Governance, Risk and Compliance as firm battles with allegations of corrupt practices by executives
** Says executive will ensure company is not involved in fraud or corrupt practices and abide by laws and regulations
** Up to Tuesday's close, shares had fallen 50.4 pct in less than three months after hitting a 2014 high of $20.94 on Sept. 3
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