high
Summary
Summary
Action- More Information
| How it spreads |
|
|---|---|
| Affected operating systems | Windows |
| Characteristics |
|
| Protection available since | 15 December 2004 14:48:12 (GMT) |
| Detected by | All Sophos products |
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Action
- Summary
- Action
- More Information
Please follow the instructions for removing worms.
Replace the Hosts file from a backup or edit it in Notepad to remove the changes that the worm has made.
Windows NT/2000/XP/2003
In Windows NT/2000/XP/2003 you will also need to edit the following registry entry. The removal of this entry is optional in Windows 95/98/Me. 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 entry:
HKLM\Software\Microsoft\Windows\CurrentVersion\Run\
and remove any reference to any file you deleted.
Close the registry editor.
More Information
W32/Dedler-E is a network worm with backdoor Trojan functionality.
W32/Dedler-E will connect to an ICQ chat server and await backdoor commands over the ICQ network. The worm is capable of downloading and running further executables.
W32/Dedler-E is capable of spreading to network shares protected by weak passwords.
W32/Dedler-E will attempt to disable anti-virus and security software and deny access to certain anti-virus websites. The worm will attempt to disable the Windows update service.
When first run, W32/Dedler-E will copy itself to the Windows system folder as CSMRS.EXE. In order to run automatically each time a user logs on, W32/Dedler-E will set one of the following registry entries:
HKLM\Software\Microsoft\Windows\CurrentVersion\Run
MsgApi
<path to worm EXE>
HKLM\Software\Microsoft\Windows\CurrentVersion\Run
WindowsInstaller
<path to worm EXE>
HKLM\Software\Microsoft\Windows\CurrentVersion\Run
WIN95DEFVIEW
<path to worm EXE>
HKLM\Software\Microsoft\Windows\CurrentVersion\Run
VC5MediaPlayer
<path to worm EXE>
W32/Dedler-E will attempt to disable and delete the following security related services:
Network Client Monitor
Network Client
kavsvc
SAVScan
Symantec Core LC
navapsvc
wuauserv
In order to deny access to certain anti-virus websites, W32/Dedler-E will overwrite the HOSTS file found in the <SYSTEM>\drivers\etc folder. The new HOSTS file will redirect network traffic intended for anti-virus websites back to the computer. For example,
127.0.0.1 www.sophos.com
127.0.0.1 sophos.com
W32/Dedler-E will then connect to login.icq.com and wait for further backdoor commands over the ICQ chat network.
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