W32/Rbot-OY

Please follow the instructions for removing worms.

You will also need to edit the following registry entries, if they are present. Please read the warning about editing the registry.

At the taskbar, click Start|Run. Type 'Regedit' and press Return. The registry editor opens.

Before you edit the registry, you should make a backup. On the 'Registry' menu, click 'Export Registry File'. In the 'Export range' panel, click 'All', then save your registry as Backup.

Locate the HKEY_LOCAL_MACHINE entries:

HKLM\Software\Microsoft\Windows\CurrentVersion\Run

HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices

and remove any reference to any file you deleted.

Each user has a registry area named HKEY_USERS\[code number indicating user]\. For each user locate the entry:

HKU\[code number]\Software\Microsoft\Windows\
CurrentVersion\Run\

and remove any reference to any file you deleted.

Close the registry editor.

Check the following items

• To renable DCOM you can edit the registry, but it's better to use Dcomcnfg.exe. See Microsoft article 825750 for details.
• The HKLM\SYSTEM\CurrentControlSet\Control\Lsa\restrictanonymous = "1" setting does not allow enumeration of SAM accounts and names. The default is "0". It can be changed in Local Security Policy. See Microsoft article 246261 for details.
• Check your administrator passwords and review network security.

W32/Rbot-OY is a network worm and IRC backdoor Trojan.

W32/Rbot-OY is capable of spreading to computers on the local network protected by weak passwords after receiving the appropriate backdoor command. W32/Rbot-OY is a network worm and IRC backdoor Trojan.

W32/Rbot-OY is capable of spreading to computers on the local network protected by weak passwords after receiving the appropriate backdoor command.

W32/Rbot-OY may also spread by exploiting the following vulnerabilities:

LSASS (MS04-011)
DCOM (MS04-012)
Microsoft SQL servers with weak passwords.

W32/Rbot-OY may attempt to spread with a filename of log.exe.

When first run, W32/Rbot-OY moves itself to the Windows system folder as winlogg.exe. In order to run each time Windows is started, W32/Rbot-OY creates the following registry entries:

HKLM\Software\Microsoft\Windows\CurrentVersion\Run\
Windows debug logging = "winlogg.exe"

HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices\
Windows debug logging = "winlogg.exe"

HKCU\Software\Microsoft\Windows\CurrentVersion\Run\
Windows debug logging = "winlogg.exe"

The worm runs continuously in the background providing backdoor access to the infected computer.

The backdoor component of W32/Rbot-OY can be used to:

Initiate distributed denial-of-service (DDoS) attacks using ICMP, SYN, UDP, PING, ACK and TCP flooding.
Redirect TCP and SOCKS4 traffic.
Provide a remote login shell.
Download, upload, delete and execute files.
Set up an HTTP, TFTP and FTP file server.
Steal passwords (including PayPal account information).
Log key presses.
Capture screenshots.
Capture webcam pictures and videos.
List and kill processes.
Stop, start and pause services.
Open and close vulnerabilities.
Port scan for vulnerabilities on other remote computers.
Send emails as specified by the remote user.
Flush the DNS and ARP caches.
Shut down and reboot the computer.
Add and delete network shares and users.
Sniff network traffic for passwords.

W32/Rbot-OY may be used to steal registration and key details from several computer games and applications.

W32/Rbot-OY may alter the following registry entries in order to enable/disable DCOM and open/close restrictions on IPC$ shares:

HKLM\Software\Microsoft\Ole\
EnableDCOM

HKLM\System\CurrentControlSet\Control\Lsa\
restrictanonymous

HKLM\System\ControlSet<NUMBER>\Control\Lsa\
restrictanonymous

W32/Rbot-OY may add and delete network shares and users on the infected computer.