Backdoor.RAdmin.ab is a malicious Trojan that injects rootkit components into Windows processes to avoid detection. Backdoor.RAdmin.ab can make changes to Windows Explorer settings and download other malicious files from external servers. Backdoor.RAdmin.ab monitors user activities to obtain valuable information, specifically username and password information. Backdoor.RAdmin.ab is a dangerous threat and should be removed immediately using reliable antivirus software.