Avast, an antivirus software, started detecting all binaries created with Delphi as malware.
At first, it looked like just an isolated incident but according to Avast forum, they really had a bad false positive issue today. Admittedly, they reported that this incident does not only affects Delphi binaries but Avast started flagging hundreds of innocent files as a “Win32:Delf-MZG” Trojan. The files affected were high-profile programs produced by Adobe, Realtek sound card drivers, various media players among others.
The errant update had been issued around 12:15 a.m. GMT. A new update was issued at 5:50 a.m. GMT that corrected the problem.
A step-by-step guide on how to restore the files from the Virus Chest can be found here: http://support.avast.com/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=376