For a while, most security people agree on the fact that antivirus products are not enough for effective protection against malicious code. If they can block many threats, some of them remain undetected by classic technologies. Here is another example with a simple but effective PowerShell backdoor that I spotted yesterday. The file has been uploaded on VT (SHA256:4cd82b6cbd3e20fc8a9a0aa630d2a866d32cfb60e76b032191fda5d48720a64d) and received a score of ... 0/57! [1].