high
Summary
Summary
Action- More Information
| How it spreads |
|
|---|---|
| Affected operating systems | Windows |
| Characteristics |
|
| Included in our products from | March 2006 (4.03) |
| Protection available since | 7 February 2006 15:06:38 (GMT) |
| Detected by | All Sophos products |
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 for each user who ran the virus. 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.
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\
sysformat
<System>\sysformat.exe
and delete it if it exists.
Close the registry editor.
More Information
W32/Bagle-CH is a mass-mailing worm for the Windows platform.
W32/Bagle-CH will attempt to harvest email addresses from the infected computer and then mail itself to those addresses as an attachment.
Messages sent by the worm have the following characteristics:
Sender: an address harvested from the infected computer
Subject: price
Message text: February Price
Attachment name: chosen at random from
price.zip
pricelst.zip
pricelist.zip
price_lst.zip
new_price.zip
February_price.zip
21_price.zip
The zip contains two files:
<random1>.exe : the W32/Bagle-CH executable
<random2> (no extension) : a text file containing random lowercase characters
W32/Bagle-CH will attempt to copy itself to folders whose name contains the word 'shar' using the following filenames:
1.exe
2.exe
3.exe
4.exe
5.scr
6.exe
7.exe
8.exe
9.exe
10.exe
Ahead Nero 7.exe
Windown Longhorn Beta Leak.exe
Opera 8 New!.exe
XXX hardcore images.exe
WinAmp 6 New!.exe
WinAmp 5 Pro Keygen Crack Update.exe
Adobe Photoshop 9 full.exe
Matrix 3 Revolution English Subtitles.exe
ACDSee 9.exe
The worm will not function after the 30th of April, 2007.
When first run W32/Bagle-CH copies itself to <System>\sysformat.exe.
The following registry entry is created to run sysformat.exe on startup:
HKCU\Software\Microsoft\Windows\CurrentVersion\Run
sysformat
<System>\sysformat.exe
W32/Bagle-CH sets the following registry entries, disabling the automatic startup of other software:
HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess
Start
4
Note: disabling autostart for the SharedAccess service deactivates the Microsoft Internet Connection Firewall (ICF).
Registry entries are created under:
HKCU\Software\Microsoft\Params\
The worm will also attempt to modify the Windows HOSTS file and terminate various anti-virus and security related processes.
|
