I noticed a couple things about these attacks now that a domain I control was recently hit with a variety of exploits (fortunately it's secure against all of them.)
- They only try one type of exploit at a time, and they only attempt it once.
- They use a different ip address for each attempt that they make, indicating that it's a distributed attack and seemingly automated.
The first attack attempted to exploit HORDE, a web mail client, using an outdated and assumedly unpatched version.
All other attacks (three so far) have focused on unpatched or outdated installs of WordPress.
The IP's appear to all be home internet accounts using cable or DSL connections, indicating that the storm infection is behind it (previously discussed, I am sure.)
fyi, if it helps.
SiL