W32/Rbot-AYL

Please follow the instructions for removing worms.

W32/Rbot-AYL is a worm and IRC backdoor Trojan for the Windows platform.

W32/Rbot-AYL runs continuously in the background, providing a backdoor server which allows a remote intruder to gain access and control over the computer via IRC channels.

W32/Rbot-AYL spreads:

- to other network computers infected with: Troj/Kuang, Troj/Sub7, Troj/NetDevil, W32/MyDoom, W32/Bagle and Troj/Optix
- to other network computers by exploiting common buffer overflow vulnerabilities, including: LSASS (MS04-011), RPC-DCOM (MS04-012), WKS (MS03-049) (CAN-2003-0812), WebDav (MS03-007), UPNP (MS01-059) and Dameware (CAN-2003-1030)
- by copying itself to network shares protected by weak passwords

W32/Rbot-AYL includes functionality to:

- steal confidential information
- carry out DDoS flooder attacks
- silently download, install and run new software

When first run W32/Rbot-AYL copies itself to <System>\nortonav.exe.

The following registry entries are created to run nortonav.exe on startup:

HKCU\Software\Microsoft\Windows\CurrentVersion\Run
Norton Antivirus
nortonav.exe

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
Norton Antivirus
nortonav.exe

HKCU\Software\Microsoft\Windows\CurrentVersion\RunServices
Norton Antivirus
nortonav.exe

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices
Norton Antivirus
nortonav.exe

Registry entries are set as follows:

HKCU\SYSTEM\CurrentControlSet\Control\Lsa
Norton Antivirus
nortonav.exe

HKLM\SYSTEM\CurrentControlSet\Control\Lsa
Norton Antivirus
nortonav.exe

HKCU\Software\Microsoft\OLE
Norton Antivirus
nortonav.exe

HKLM\SOFTWARE\Microsoft\Ole
Norton Antivirus
nortonav.exe