The VN-Index shook off a week-long slide Thursday to enjoy a gain for the first time this month. Stocks traded in positive territory for almost the entire session, peaking above 668 before closing up 4.79 points, or 0.7%, to 666.07. GAS (+2.4%) was the biggest contributor to the gain as Brent crude oil prices rose in Asian trading today, extending a 7.4% rally over the last week.