735 ILCS 5/12-132
If a redemption is not made, pursuant to Section 12-122 of this Act where applicable, prior to the making of redemption under this Section, any judgment creditor, his or her heirs, executors, administrators or assigns may, after the expiration of 3 months and within 6 months after the sale, redeem the premises in the following manner: such creditor, so entitled to redeem, his or her heirs, executors, administrators or assigns may obtain a certified copy of the judgment, and place the same with the sheriff or other proper officer for enforcement, and the sheriff or other proper officer shall endorse upon the back thereof a levy of the premises desired to be redeemed; and the person so entitled and desiring to make such redemption shall pay to such officer the amount for which the premises to be redeemed were sold, with interest thereon at the rate of 10% per annum from the date of the sale, for the use of the purchaser of such premises, his or her heirs, executors, administrators or assigns, whereupon such officer shall prepare and file in the office of the recorder of the county in which the premises are situated a certificate of such redemption, and shall advertise and offer the premises for sale under the judgment as in other cases of sale under a judgment.
735 ILCS 5/12-132