W32.Sober@mm is a mass-mailing worm that utilizes victim’s computer as SMTP engine to email a copy of itself. This infection is a memory-resident worm that specifically targets Windows platform. W32.Sober@mm is written in Microsoft Visual Basic programming language and is UPX compacted.

Other Alias: W32/Sober@MM, I-Worm.Sober , W32/Sober-A, WORM_SOBER.A , Win32.Sober.A, Win32.HLLM.Odin,  Worm/Sober,  Win32/Sober.A@mm,  I-Worm.Win32.Sober,  I-Worm/Sober.A,  W32/Sober.A.worm

Damage Level: Low

Systems Affected: Windows 9x, 2000, XP, Windows Vista

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Upon execution, this worm will drop three versions of the file under Windows system directory. The mail file is SIMILARE.EXE. The two other files are consisting of any variations listed on “Associated Files and Folder” area. To run these varying files, the worm will create a registry entries that calls for execution each time Windows starts.

While inside the infected computer, W32.Sober@mm gathers email address and saves the collected information under MEDIA.DLL file.

The worm will spread via using a built-in Send Mail Transfer Protocol (SMTP). It collects contact details or email address from the infected computer where it later will be the recipients of spam email messages containing a copy of the worm.

An email sent out by this worm contains variations of subject and attached file. It fakes the FROM field and pretends to be coming from a legitimate and trusted sender. Some examples of the messages are as follows:

Email Message:
I permanently get Spam-Mails from you and inside is a virus!!
You should remove these things.
Sorry, but the ODIN Worm is probably on your computer!
You should check this with the patch application.
See you soon
Attachment: check-patch.bat

Email Message:
Programmer of the -Sobig Worm-
Congratulations!! Your Sobig Worms are very good!!!
You are a very good programmer!
Yours faithfully
Odin alias Anon
pan>Attachment: Odin_Worm.exe

How to Remove W32.Sober@mm

1. Temporarily Disable System Restore (Windows Me/XP). [how to]
2. To be able to identify even the most recent variant of W32.Sober@mm, open your antivirus application and update the virus definition file.

3. Start Windows in Safe Mode with Networking.
- From a power-off state, turn on the computer and press F8 on your keyboard repeatedly.
- Your computer will display Windows Advanced Boot Options menu. Please select Safe Mode with Networking.
- The system will now boot Windows and loads only necessary drivers and files.

4. Connect to Internet and download W32.Sober Removal Tool from Symantec.

5. Once the download completes, double click on the file FixSbr.exe to run the program.

6. Allow the tool to run until it finds and delete the virus.

Alternative Removal Method for W32.Sober@mm

Option 1 : Use Windows System Restore to return Windows to previous state

If W32.Sober@mm enters the computer, there is a big chance that Windows files, registry entries and other essential components are also infected. System Restore can reinstate clean system files by restoring the configuration to an earlier date. The method also replaces compromised files with a clean version. If you have a saved restore point before W32.Sober@mm infiltrates the PC, we highly encourage you to execute this procedure if none of the above works. You may proceed with Windows System Restore, click here to see the full procedure.

Option 2 : W32.Sober@mm manual uninstall guide

IMPORTANT! Manual removal of W32.Sober@mm requires technical skills. Deleting system files and registry entries by mistake may result to total disability of Windows system. We advise you to perform a backup of registry before proceeding with this guide.

1. Kill any running process that belongs to W32.Sober@mm.
- Press Ctrl+Alt+Del on your keyboard.
- When Windows Task Manager appears, look for W32.Sober@mm files (refer to Technical Reference) and click End Process.

End Task

2. Delete all registry entries that belong to this malware.
- Press [Windows Key]+R on your keyboard.
- In the 'Open' dialog box, type regedit and press Enter. This will open registry editor.
- Find and delete registry entries as mentioned in Technical Reference section below.
- Close registry editor. Changes made will be save automatically.

Run Regedit

3. Scan the computer with antivirus program.
- Connect to Internet and open your antivirus software. Please update to obtain the latest database and necessary files.
- Restart the computer in Safe Mode.
- Just before Windows logo begins to load press F8 on your keyboard.
- On Windows Advanced Boot Options, select Safe Mode and press Enter.

4. Delete all files dropped by W32.Sober@mm.
- While still in Safe Mode, search and delete malicious files. Please refer to 'Technical Reference'. Make sure that you execute 'End Task' first before deleting the file. Otherwise, the system will not let you perform this action.

Associated Files and Folders:Added Registry Entries:

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