- VBS.VBSWG.AF is a Visual Basic Script (VBS) threat that can overwrite .vbe or .vbs files with a copy of itself. It attempts to send itself using MAPI email, but the attempt fails due to bugs in the script. In an attempt to distribute itself using Internet Relay Chat (IRC), it may also modify ...www.symantec.com/avcenter/venc/data/vbs.vbswg.af.html