You will need to request a review from Google so they may delist the site;
To delist your website from this block you need to contact Google
This excerpt was copied from the URL below, and provides step by step instructions to request a delisting.
Once you have reviewed your site and are sure it is clean, you can can submit a request for review. Note that you'll need to verify site ownership before you can request a site review.
1. Sign in to Webmaster Tools with your Google account.
2. On the Dashboard, select the site you want.
3. On the Overview page, click Request a review and follow the instructions.
I have enabled RAW ACCESS LOGGING so if this occurs again please do not touch the account and contact us immediately as we'd like to investigate. In the meantime please do the following to help secure your account.
You will need to update any scripts, programs, software, blogs, bulletins, shopping carts, etc.. located on the account. Outdated installs have been known to be exploitable. Also change the cpanel password for the account as it could have been breached as well. Use a long string such as: v7dsjsif734h5438s would be considered a strong password.