The confirmation came amid reports that he has been suspended by the Bangladesh Cricket Board.
Ashraful, 28, was questioned by the ICC's anti-corruption and security unit (ACSU) as part of investigations into the Bangladesh Premier League.
Reports from Dhaka suggest that Ashraful has been banned from domestic and international matches by the BCB until the matter is resolved and it is known that board president Nazmul Hassan was due to address local media this morning.
The BCB were not available for comment on Tuesday.
A spokesman for the ICC told the media: "We can confirm that the ACSU has interviewed Mohammad Ashraful, who is helping us in the ongoing investigations.
"Due to sensitivities around these investigations, the ICC cannot share any more details at this stage."
Ashraful is one of Bangladesh's best known players, representing the Tigers in 61 Tests, 177 one-day internationals and 23 Twenty20s.
He represented Dhaka Gladiators in the BPL.
The Indian Premier League is also the subject of investigation at present, with a spate of arrests by Mumbai Police taking place, including three Rajasthan Royals players.
The Board of Control for Cricket in India's president N Srinivasan has temporarily passed over his duties after his son-in-law Gurunath Meiyappan, an official with Chennai Super Kings, was also arrested.