Vietcombank sold the greenback at VND25,050, up 0.08% from Thursday.
The greenback was stable at VND25,200 on the black market.
The State Bank of Vietnam's reference rate rose by 0.01% to VND24,224.
Since the beginning of the year, the dollar has increased against the dong by 2.58%.
Globally, the dollar traded near a one-week high versus major peers on Friday, on track to snap a five-week losing run, after robust economic data pared bets for aggressive Federal Reserve interest rate cuts, Reuters reported.
The U.S. dollar index, which measures the currency against a basket of six major peers, was little changed at 101.34, after rising 0.36% on Thursday and touching the highest since Aug. 22 at 101.58.
It is on course for a 0.66% gain this week, which would be its best week since the start of August and snap a five-week losing streak. Over August though, it is set for a 2.6% drop, which would be its worst month since November.
The dollar eased 0.14% to 144.78 yen, after rising as high as 145.55 overnight for the first time since Aug. 23.
The euro was flat at $1.1082 and dropped as low as $1.10555 on Thursday.