VirTool:Win32/CeeInject.gen!J is Microsoft's generic detection for a group of applications often used by malware authors to inject code into other running Windows applications.
VirTool:Win32/CeeInject.gen!J usually detect files that carry different kinds of payloads that do a number of things without the user's knowledge. The payload is then inserted into other currently running applications, such as an innocuous file download injected into Internet Explorer that actually downloads other malware.
Analysis by Jireh Sanico
Alerts from your security software may be the only symptom.