high
Summary
Summary
Action- More Information
| Affected operating systems | Windows |
|---|---|
| Characteristics |
|
| Protection available since | 2 September 2005 13:10:56 (GMT) |
| Last updated | 11 October 2005 19:50:10 (GMT) |
| Detected by | All Sophos products |
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Action
- Summary
- Action
- More Information
Please follow the instructions for removing worms.
You should also check your Internet Explorer settings using Tools|Internet options|General for any modifications made by the worm.
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
Instance 001
<pathname of the worm executable>
and delete it if it exists.
Close the registry editor.
More Information
W32/Alasrou-A is an email address harvesting worm for the Windows platform.
W32/Alasrou-A spreads to other network computers by exploiting common buffer
overflow vulnerabilites, including LSASS (MS04-011).
W32/Alasrou-A includes functionality to download, install and run new software. W32/Alasrou-A is an email address harvesting worm for the Windows platform.
W32/Alasrou-A spreads to other network computers by exploiting common buffer
overflow vulnerabilites, including LSASS (MS04-011).
W32/Alasrou-A includes functionality to download, install and run new software.
When W32/Alasrou-A is installed the following files are created:
<Temp>\file1.exe
<System>\searchpage.htm
File1.exe is downloaded from a remote server, and searchpage.htm is set as the
default search page for Internet Explorer.
W32/Alasrou-A also searches for the file thebat.abd, and files with the following extensions, harvesting email addresses:
.tbb
.dbx
.nk2
.wab
The collected emails are then uploaded to a remote FTP server.
The following registry entry is created to run W32/Alasrou-A on startup:
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
Instance 001
<pathname of the worm executable>
W32/Alasrou-A changes settings for Microsoft Internet Explorer, including the Start Page and Search Page, by modifying values under:
HKCU\Software\Microsoft\Internet Explorer\Security\
HKCU\Software\Microsoft\Internet Explorer\Main\Search Page
HKCU\Software\Microsoft\Internet Explorer\Main\Start Page
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