W32/Sdbot-OC

Please follow the instructions for removing worms.

You will also need to edit the following registry entries, if 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:

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

and remove any reference to any file you deleted.

Close the registry editor.

• Check your administrator passwords and review network security.
• Replace the Hosts file from a backup or edit it in Notepad to remove the changes that the worm has made.

W32/Sdbot-OC is a network worm which contains IRC backdoor Trojan functionality, allowing unauthorised remote access to the infected computer. W32/Sdbot-OC is a worm which attempts to spread to remote network shares. It also contains backdoor Trojan functionality, allowing unauthorised remote access to the infected computer via IRC channels while running in the background as a service process.

W32/Sdbot-OC copies itself to the Windows system folder as NTSYSMGR.EXE and as COOL.EXE and creates entries in the registry at the following locations with the value Microsoft System Checkup so as to run itself on system startup:

HKLM\Software\Microsoft\Windows\CurrentVersion\Run\
HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices\

W32/Sdbot-OC also sets the following registry entry so as to run a file called SYSLOG32.EXE on system startup, though no file of that name is dropped explicitly:

HKLM\Software\Microsoft\Windows\CurrentVersion\Run\NT Logging Service

W32/Sdbot-OC spreads to network shares with weak passwords as a result of the backdoor Trojan element receiving the appropriate command from a remote user.

W32/Sdbot-OC may attempt to download and execute several files, dropping temporary files to the Temp folder called KSPD32A.EXE and FSYS.TMP, and to the Windows system folder called MARKER32A.VXD.

W32/Sdbot-OC attempts to terminate and disable various anti-virus and security related programs and services.

W32/Sdbot-OC attempts to delete the files SYSMGR.EXE, WNETLOGIN.EXE, KEYMGR.EXE, INETMAN.EXE, WSOCK32.EXE, DBNETLIB.EXE, WNETMGR.EXE and WNETLIB.EXE from the following locations to prevent them from runnin on system startup:

C:\Documents and Settings\All Users\Startup
C:\WINDOWS\Start Menu\Programs\Startup\
C:\WINNT\Profiles\All Users\Start Menu\Programs\Startup

W32/Sdbot-OC also modifies the HOSTS file located in the subfolder drivers\etc\hosts of the Windows system folder,mapping selected anti-virus websites to the loopback address 127.0.0.1 in an attempt to prevent access to these sites. Typically the following mappings will be appended to the HOSTS file:

127.0.0.1 www.symantec.com
127.0.0.1 securityresponse.symantec.com
127.0.0.1 symantec.com
127.0.0.1 www.sophos.com
127.0.0.1 sophos.com
127.0.0.1 www.mcafee.com
127.0.0.1 mcafee.com
127.0.0.1 liveupdate.symantecliveupdate
127.0.0.1 www.viruslist.com
127.0.0.1 viruslist.com
127.0.0.1 f-secure.com
127.0.0.1 www.f-secure.com
127.0.0.1 kaspersky.com
127.0.0.1 www.avp.com
127.0.0.1 www.kaspersky.com
127.0.0.1 avp.com
127.0.0.1 www.networkassociates.com
127.0.0.1 networkassociates.com
127.0.0.1 www.ca.com
127.0.0.1 ca.com
127.0.0.1 mast.mcafee.com
127.0.0.1 my-etrust.com
127.0.0.1 www.my-etrust.com
127.0.0.1 download.mcafee.com
127.0.0.1 dispatch.mcafee.com
127.0.0.1 secure.nai.com
127.0.0.1 nai.com
127.0.0.1 www.nai.com
127.0.0.1 update.symantec.com
127.0.0.1 updates.symantec.com
127.0.0.1 us.mcafee.com
127.0.0.1 liveupdate.symantec.com
127.0.0.1 customer.symantec.com
127.0.0.1 rads.mcafee.com
127.0.0.1 trendmicro.com
127.0.0.1 www.trendmicro.com