The RCServ is a backdoor - hacker's remote access tool. The backdoor consists of a server and of a client part. The server part should be installed on some computer so that a hacker could access it using a client part. The server part provides a hacker with information about an infected system, user actions and it also allows him to get a limited access to data on an infected computer. The RCServ backdoor server allows multiple connections, so several hackers can use the same server at the same time.
Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.
The following information can be obtained using RCServ backdoor:
1. Basic system information and network configuration 2. Network passwords (for shares) 3. All keyboard activities (keylogger DLL is dropped by the backdoor) 4. Screenshot of desktop window (realtime mode also possible) 5. Backdoor sessions info (to see other sessions of the server) 6. Active processes list 7. Log of backdoor server usage 8. Backdoor server configuration settings
Other features include:
1. FTP server control 2. File manager 3. Upgradeing of server component 4. Downloading files from the WEB 5. NetBios scanner 6. UDP flooding 7. Service manager 8. Keylogging 9. Network pinging 10. Network port scanning 11. Playing tricks (swapping mouse buttons, killing windows, running screensaver, etc.) 12. Proxy control
All files detected as Backdoor.RCServ should be deleted from an infected system. If some files are locked while Windows is active, they should be deleted from pure DOS (in case of Windows 9x system) or renamed with a different extensions (.EXA for example) with further system restart (in case of NT-based system).
Technical Details: Alexey Podrezov; F-Secure Corp.; May 13th 2002