CDU, also known as Cdudoor, is a remote administration tool with common set of functions. Its server part infects victimâ€™s PC and allows remote unauthorized access to it. CDU can be used for many malicious purposes. It can steal userâ€™s valuable information, disclose personal documents, remove or corrupt files, change critical computer settings, launch and terminate softwares, etc. Several modified versions of this spyware exist with slightly different code, but same features. CDU is serious security and privacy threat and should be removed as soon as possible using malware removal and antivirus software.