Qatar condemned on Friday what it called unfounded allegations by "bad actors" after The Guardian reported the country had attempted to discredit a woman who accused the ICC's chief prosecutor of sexual misconduct.
Karim Khan is currently on leave pending an investigation into the allegations.
The allegations were brought against the British lawyer after he successfully requested an International Criminal Court arrest warrant against Israeli Prime Minister Benjamin Netanyahu for alleged war crimes in Gaza.
In an article published on Thursday, The Guardian alleged that private intelligence agencies targeted his accuser at the request of Qatar.
The objective of the secret operation was to collect information which could discredit her, in particular by uncovering links to Israel, the paper reported.
The Qatar media office on Friday denounced the report as "unfounded allegations".
"These claims are part of a coordinated campaign led by certain bad actors" it said in a statement, adding it was being targeted for its mediation role in the Gaza war.
It said the reports were based on "falsified information".
"This fits into the broader influence campaign that remains ongoing against Qatar for its mediation role, saving lives and securing the release of hostages, its support for international institutions, and upholding international law," the statement said.
It also highlighted recent legal efforts in the US filed against Qatar Charity, which were "dismissed after the courts ruled that evidence presented in the cases was fabricated".
The ICC's oversight body announced last year that it had requested an external investigation into allegations of "alleged misconduct" by Khan, without providing further details.
According to various media reports, Khan was accused of inappropriate sexual behaviour towards a member of his office. He has denied the allegations.
Last year, Khan asked the ICC to issue arrest warrants for Netanyahu, his former defence minister Yoav Gallant, and three senior Hamas officials.
All three of the Hamas leaders were later killed. The warrants against Netanyahu and Gallant were granted and remain outstanding.
In his statement announcing the warrants, Khan said: “I insist that all attempts to impede, intimidate or improperly influence the officials of this court must cease immediately.”
An investigation by The Guardian and Israeli magazines +972 and Local Call revealed a 9-year Israeli spying, hacking and intimidation campaign against the court, which included capturing Khan's communications and those of his predecessor, Fatou Bensouda.