Spokeswoman Victoria DeLong said the site, belonging to the department's Office of International Information Programs (IIP), had some functionality, but is "not fully operational". The site was defaced on 8 May, and several of its servers were attacked.
"We will not achieve full operational status for at least three to four weeks," DeLong admitted. The State Department's main Web site wasn't affected.
The site's Internet connection has been severed in order to "quarantine" it and prevent further attacks, which DeLong explained is standard procedure after a Web site has been compromised.
However, she said, officials still don't know who attacked the site.
The US Federal Bureau of Investigation and the State Department's diplomatic security services have joined the case and are going over systems logs to find the attack's point of entry and to discover its origins, DeLong said.
The site is part of the IIP, which provides information in the context of US government policy for use by 140 foreign countries.