Spokesman Jay Carney told reporters Monday that it was a "spearphishing attack against an unclassified network".
He said these types of attacks are not infrequent and the White House has mitigation measures in place, reported Xinhua.
Carney made the remarks to reporters in Henderson, Nevada, where President Barack Obama is preparing for the first presidential debate with Republican challenger Mitt Romney on Wednesday.
"In this instance the attack was identified, the system was isolated and there is no indication whatsoever that any exfiltration of data took place. Moreover there was never any impact or attempted breach of any classified system," said Carney.
Reports of the White House network was attacked last month surfaced earlier in the day. It wasn't clear who was behind the attack.
For the latest tech news and reviews, follow Gadgets 360 on X, Facebook, WhatsApp, Threads and Google News. For the latest videos on gadgets and tech, subscribe to our YouTube channel. If you want to know everything about top influencers, follow our in-house Who'sThat360 on Instagram and YouTube.