Alwil Software released official statement in their Support center about the Win32:Delf-MZG false positive issue:
Win32:Delf-MZG and Win32:Zbot-MKK false positive issues
Issue
On Thursday 3.12. 2009 avast! had a bad false positive issue. At around 12:15 AM GMT we released VPS update 091203-0 which started flagging hundreds of innocent files as a 'Win32:Delf-MZG' Trojan (or, in less common cases, as 'Win32:Zbot-MKK). Among the files affected were high-profile programs produced by Adobe, Realtek, sound card drivers, various media players etc.
On Thursday 3.12. 2009 at 5:50 AM GMT, another VPS update 091203-1 was released, fixing the issue (for both 'Win32:Delf-MZG and Win32:Zbot-MKK). If you're still using the bad VPS 091203-0 we recommend to invoke a VPS update immediately. To restore false positive files from avast! Virus Chest please follow the instruction in the following article:
How to restore false positive file from Virus Chest?
Those who have not used their computers between 12:15 AM GMT and 5:50 AM GMT will most likely not be affected.
avast! Home Edition 4.x
avast! Professional Edition 4.x
avast! Server Edition 4.x
avast! Small Business Server Edition 4.x
Operating systems:
Microsoft Windows NT 4.0 Workstation
Microsoft Windows 95
Microsoft Windows 98
Microsoft Windows ME
Microsoft Windows 2000 Professional
Microsoft Windows XP Home / Professional / Media Center Edition
Microsoft Windows Vista Starter / Home Basic / Home Premium / Business / Enterprise / Ultimate
Microsoft Windows 7 Starter / Home Basic / Home Premium / Professional / Enterprise / Ultimate
Microsoft Windows NT 4.0 Server (Any Server Edition)
Microsoft Windows 2000 Server (Any Server Edition, incl. Small Business Server)
Microsoft Windows Server 2003 (Any Server Edition, incl. Small Business Server)
Microsoft Windows Server 2008 (Any Server Edition, incl. Small Business Server)
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