WORM_WEBMONER.JC
Sophos: W32/CpLink-I; Kaspersky: Trojan-Spy.Win32.Webmoner.atv
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Worm
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
Copies itself in all available physical drives, Propagates via removable drives, Propagates via shared drives
This worm arrives by connecting affected removable drives to a system.
It adds registry entries to enable its automatic execution at every system startup.
TECHNICAL DETAILS
26,112 bytes
PE
Yes
02 Dec 2010
Drops files
Arrival Details
This worm arrives by connecting affected removable drives to a system.
It may arrive via network shares.
Installation
This worm drops the following files:
- %System Root%\Documents and Settings\All Users\Start Menu\Internet Explorer.lnk - autostart component detected as EXPL_CPLNK.SM
- %Common Startup%\Microsoft Update.lnk - autostart component detected as EXPL_CPLNK.SM
- %Favorites%\Microsoft Update.lnk - autostart component detected as EXPL_CPLNK.SM
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %Common Startup% is the system's shared Startup folder, which is usually C:\Windows\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\All Users\Programs\Startup on Windows NT, and C:\Documents and Settings\All Users\Start Menu\Programs\Startup on Windows 2000, XP, and Server 2003.. %Favorites% is the current user's Favorites folder, which is usually C:\Windows\Favorites on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Favorites on Windows NT, and C:\Documents and Settings\{user name}\Favorites on Windows 2000, XP, and Server 2003.)
Autostart Technique
This worm adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
Recycler = "%System Root%\RECYCLER.lnk"
Propagation
This worm drops the following copies of itself in all physical and removable drives:
- mso.sys
NOTES:
As part of its propagation routine, it also drops a copy of itself as MSO.SYS in all shared folders. In addition, it drops the file RECYCLER.LNK file to automatically execute copies of itself when a user accesses the drives of an affected system.
It then drops the following shortcut files, all of which are detected as EXPL_CPLNK.SM, in removable drives and shared folders:
- Documents and Settings.lnk
- Program Files.lnk
- System Volume Information.lnk
- WINDOWS.lnk
The said shortcut files are used to enable automatic execution of dropped copies in removable drives and shared folders.
SOLUTION
8.900
7.670.07
02 Dec 2010
7.671.00
02 Dec 2010
Step 1
For Windows ME and XP users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.