Does Avast 5.0.677 is good on detecting keyloggers? like Ardamax?
More than wanting to detect, you should want to prevent them. 
Yeah i know…
I dont use keyloggers.
I’m just asking what if i someone accidentally download and run the Ardamax will Avast completely block or remove it?
I good response to someone tested it already.
Avast can prevent from install/running/downloading several of keylogger software.But i dot know for Adamax. As far as i know avast has block refog keylogger (from refog.com) for download from their site. But not all of refog version. Refog still can be installed, but avast will remove one of refog file. Maybe it is core files of refog. But we must check PUP option on setting, so avast can block this kind of software. Please more advice from the others…
The biggest problem with key loggers is one of intent.
There are many commercial legitimate ones, installed by the owner of the system and obviously some ones not installed by the owner/user that are used for malicious purposes.
Whilst avast does detect keyloggers some commercial legitimate ones it doesn’t, the problem being how does an AV determine the use that a keylogger will be put and who installed it.
My guess would be that many would be determined as PUPs (Potentially Unwanted Programs) alerting the user to their presence, but many legit commercial keyloggers use methods to try and hide from detection or there would be little point in installing them to watch over your kids/employees, etc.