It claimed Pyongyang had a “well-regulated” system to combat money laundering and was “not frightened in the least” by the latest label.
Washington’s move comes after the UN Security Council slapped the harshest-ever sanctions on the North in March for its widely-condemned nuclear test and a long-range missile launch.
The North staged its fourth atomic test in January and a long-range rocket test a month later — widely seen as a ballistic missile test, banned under existing UN resolutions.
Washington led the drive for new sanctions applied in March, which urged unprecedented inspections of all cargo to and from the North, and called for UN members to sever banking ties with Pyongyang.
The money laundering designation however was proof that the US found it “hard to achieve its objective (to punish the North) through the unreasonable UN… sanctions,” said KCNA statement.
“The US is sadly mistaken if it calculates it can attain its sinister political goal through the action,” it added.
The North has recently faced growing pressure from the international community, although questions remain on whether China — its economic lifeline — would join the push.
US Treasury Secretary Jack Lew is set to urge China to crack down harder on the North during a planned visit to Beijing from Monday to Tuesday, according to senior US officials.