In light of the increasing number of D3 accounts being compromised, I suggest a solution to stop those bots from posting keylogger links.
Pretty simple solution actually:
1) all newly joined members need to have a mod approved their post before it could be displayed
2) Only members with at least 10 posts (all of which are approved by a mod) can post a new topic
This is the current solution for another gaming forum and it is really effective in stopping bots/trolls, although more work has to be done on the mods' part.