avast failed to detect trojan downloader.fr why ?
avast! is mainly antivirus program, so viruses and worms are its main target. But it is able to detect tons of Trojans too! If you have any suspected file which you think should be detected, send it to virus@avast.com. It will be inspected and if it is malware, it will be added to avast! detection soon.
Pavel
my friend who got infected by this trojan .she had send this file two or three days before to avast but it is still not added to detection