Cxover.A infects devices over Microsoft's ActiveSync protocol. If the Cxover.A binary is executed on a Windows Mobile device, it looks for the PC over the ActiveSync connection and copies itself to the PC so that it will start automatically at next boot.
If Cxover.A is executed on a Windows PC it will search for any handled devices connected over ActiveSync and copy itself there.
F-Secure Anti-Virus detects this malware with the following updates:
Version = 2006-03-15_02.
F-Secure Mobile Anti-Virus for Windows Mobile detects this malware starting from the update build number 16.