Vietcombank sold the greenback at VND26,100, down 0.38% from Thursday. On the black market, the currency slid by 0.08% to around VND26,438.
The State Bank of Vietnam lowered its reference rate by 0.04% to VND25,074.
Globally, the dollar rose on Friday, paring its weekly slide, after U.S. President Donald Trump said he would soon announce his nominee to head the Federal Reserve and on optimism Washington will avert a government shutdown, Reuters reported.
It hit a four-year low earlier in the week after Trump seemed to shrug off the currency's weakness.
The dollar index, which measures the greenback against a basket of currencies, rose 0.4% to 96.60 on Friday, trimming its weekly decline to 0.9%. Against the Swiss franc, the dollar strengthened 0.7% to 0.7699.
The euro sank 0.4% at $1.1916, while the yen weakened 0.42% to 153.77 per dollar. Sterling weakened 0.32% to $1.3759.
The Australian dollar weakened 0.7% versus the greenback to $0.6996. New Zealand's kiwi weakened 0.5% to $0.6045.