This indicates that a system might be infected by Catuaba Botnet.
Catuaba is a malware that targets Windows platform. It uses IRC to connect to C&C server and allows a remote attacker to execute shell commands on the infected machine.
Any unprotected Windows system is vulnerable
System Compromise: Remote attackers can gain control of vulnerable systems.
If required, the signature's action can be set to "Block".
Please use Anti-Virus software to scan and clean the infected computer.