RDP scanners seem to generate a lot of binpac errors in dpd.log for RDP connections.
The following log line is an example of the error that repeats continuously during the activity:
1441031469.413008 CPNcey4q2i8mGVUvEg 22.214.171.124 62082 10.10.81.207 3389 tcp RDP Binpac exception: binpac exception: out_of_bound: DT_Data:application_type: 3 > 2
The 10.x.x.x IP is the redacted local IP. The other IP is the scanner.
RHEL 6.6, 2.4-10 bro build from git