W32/Rbot-AIU

Please follow the instructions for removing worms.

Change any data that may have become compromised.

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.

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.

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

W32/Rbot-AIU spreads:

- to other network computers infected with:

Troj/Kuang
Troj/Sub7
Troj/NetDevil
W32/MyDoom
W32/Bagle
Troj/Optix

- to other network computers by exploiting common buffer overflow vulnerabilites, including:

LSASS (MS04-011)
RPC-DCOM (MS04-012)
WKS (MS03-049) (CAN-2003-0812)
WebDav (MS03-007)
IIS5SSL (MS04-011) (CAN-2003-0719)
MSSQL (MS02-039) (CAN-2002-0649)
UPNP (MS01-059)
Veritas (CAN-2004-1172)
Dameware (CAN-2003-1030)

- by copying itself to network shares protected by weak passwords

W32/Rbot-AIU 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-AIU includes functionality to:

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

When first run W32/Rbot-AIU moves itself to <System>\sound.pif.

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

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
SOUNDMAN Microsoft Help
soun.pif

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices
SOUNDMAN Microsoft Help
soun.pif

W32/Rbot-AIU sets the following registy entries:

HKLM\SOFTWARE\Microsoft\Ole
EnableDCOM
N

HKLM\SYSTEM\CurrentControlSet\Control\Lsa
restrictanonymous
1

The following patches for the operating system vulnerabilities exploited by W32/Rbot-AIU can be obtained from the Microsoft website:

MS04-011
MS04-012
MS03-049
MS03-007
MS02-039
MS01-059