This indicates an attack attempt against a Buffer Overflow vulnerability in Random Software's Icarus.
The vulnerability is caused by Icarus when handling a malicious file. It allows a remote attacker to execute arbitrary code via sending a specially crafted "ICP" file.
Random Software Icarus 2.0
System Compromise: Remote attackers can gain control of vulnerable systems.
Denial of Service: Remote attackers can crash vulnerable systems.
Currently we are not aware of any vendor supplied patch for this issue.