Vietcombank sold the greenback at VND26,040, up 0.04% from Thursday morning's 1.5-year low of VND26,030. The currency held firm at around VND26,080 at unofficial exchange points.
The State Bank of Vietnam lowered its reference rate by 0.02% to VND25,627.
Globally,the Japanese yen hit its strongest level in more than a month on Friday, buoyed by safe-haven flows due to a fresh bout of risk aversion that also sent US Treasury yields sharply lower, pushing the dollar to a nearly three-week trough, Reuters reported.
The dollar index, which measures the greenback against a basket of currencies, was at 101.52, after touching its lowest level since the beginning of the month at 101.44 on Thursday.
The yen strengthened 0.3% to 156.28 per dollar, leading gains among major currencies. It was set for a 1% gain for the week, its strongest weekly rise since early September. The Euro was largely flat at $1.122.
The Canadian dollar firmed past C$1.40 against the greenback, up 0.1% to its strongest level in a month. The Swiss franc was steady at 0.8199 per dollar, near its firmest level in a month.