Scan your computer with your Trend Micro product to delete files detected as OSX_FLASHBCK.DL. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.
To delete the downloaded file:
Open a Terminal window. To open a terminal window, double-click Applications > Utilities > Terminal in Finder.
In the Terminal window, type the following command: