high
Summary
Summary
Action- More Information
| Protection available since | 22 December 2003 15:17:01 (GMT) |
|---|---|
| Detected by | All Sophos products |
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Action
- Summary
- Action
- More Information
Please follow the instructions for removing worms.
Delete any dropped files you do not want, ensuring that the names match those of the dropped files completely.
Check your administrator passwords and review network security.
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
\Generic Host Process for Win32 Services
= C:\<Windows system>\winsvc.exe
HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices
\Generic Host Process for Win32 Services
=C:\<Windows system>\winsvc.exe
and delete them if they exist.
Close the registry editor.
More Information
W32/SdBot-O is a worm which attempts to copy itself to IPC$, C and C$ network shares with weak or no passwords. The worm also allows unauthorised remote access to the computer via IRC channels.
W32/SdBot-O copies itself to the Windows system folder as winsvc.exe and adds the following entries to the registry to run itself on system restart:
HKLM\Software\Microsoft\Windows\CurrentVersion\Run
\Generic Host Process for Win32 Services
= C:\<Windows system>\winsvc.exe
HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices
\Generic Host Process for Win32 Services
=C:\<Windows system>\winsvc.exe
The worm also attempts to drop a file called SVCHOST32.EXE within the Windows system folder. This file is a legitimate networking utility called PSEXEC.
W32/SdBot-O then drops and executes the following BAT files in an attempt to spread to remote shares using PSEXEC:
C:\<Windows system32>/RUNTIME.BAT
C:\<Windows temp>/B.BAT
The worm then attempts to connect to a specific IRC channel and listen for commands from a remote intruder.
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