[TheBattman]

According to Symantec, OSX.Macarena, isn't designed to infect PowerPC Mach-O binaries, nor Universal binaries, those meant to run on both the PowerPC and Intel Mac platforms.

Then what exactly is infected???

[Swordmaker]

Then what exactly is infected???

Apparently only system files for OS X Intel which are neither PowerPC nor Universal.

Interestingly, since it can only infect files in the same folder where it's located, then it has to be installed in a SYSTEM folder where the vulnerable files are located... which would require ROOT level permissions to do. One more reason this cannot spread.