high
Summary
Summary
Action- More Information
| How it spreads |
|
|---|---|
| Affected operating systems | Windows |
| Characteristics |
|
| Included in our products from | August 2005 (3.96) |
| Protection available since | 29 June 2005 12:57:12 (GMT) |
| Detected by | All Sophos products |
Action
- Summary
- Action
- More Information
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.
More Information
W32/Rbot-AGO is a worm and IRC backdoor Trojan for the Windows platform.
W32/Rbot-AGO 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-AGO spreads to other network computers by exploiting common buffer overflow vulnerabilites, including: LSASS (MS04-011), RPC-DCOM (MS04-012), WKS(MS03-049) (CAN-2003-0812) and MSSQL (MS02-039) (CAN-2002-0649) and by copying itself to network shares protected by weak passwords.
When first run W32/Rbot-AGO copies itself to <System>\crssr.exe.
The following registry entries are created to run crssr.exe on startup:
HKCU\Software\Microsoft\Windows\CurrentVersion\Run
MS taskbar
crssr.exe
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
MS taskbar
crssr.exe
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices
MS taskbar
crssr.exe
Registry entries are set as follows:
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-AGO can be obtained from the Microsoft website:
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