This indicates an attack attempt to exploit a Command Execution vulnerability in Trend Micro Smart Protection Server.
The vulnerability is due to an error when the vulnerable software attempts to handle a maliciously crafted user input. An attacker can exploit this to execute arbitrary code within context of the application, via a crafted request.
Trend Micro Smart Protection Server Version 3.1 before patch CP b1030
Trend Micro Smart Protection Server Version 3.0 before patch CP b1348
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrades or patches from the vendor.