Threat Description



Category: Malware
Platform: W32
Aliases: Sober.Z, Email-Worm.Win32.Sober.z, W32/Sober.Z@mm


The Sober.Z worm was found on November 15th, 2005. This Sober variant is similar to Sober.T, that appeared on November 14th:

Like the previous variants, this one sends itself inside a ZIP archive as an attachment in e-mail messages with English or German texts. We also received several different droppers for this worm variant. They were apparently created by the worm author manually. They are all detected as 'Sober.z'.


Automatic action

Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.

More scanning & removal options

More information on scanning or removal options is available in the documentation for your F-Secure security product on the Downloads section of our Home - Global site.

You may also refer to the Knowledge Base on the F-Secure Community site for more information.

Contact Support

For further assistance, F-Secure customers can request support online via the Request support or the Chat forms on our Home - Global site.

Technical Details

This Sober variant sends a bit different e-mail messages:


Betr: Passwort & Account Daten  


Ihre Account bzw. Passwort aenderung wurde nun vorgenommen.  Ihre neuen Zugangsdaten befinden sich Ge-Packt & Gesichert im Anhang!  AutoMailSystem: #HF011BACC091F  

Attachment name starts with:


---- OR ----


Password Confirmation  


Your password has been changed successfully!  Your new password is packed and safe in the attachment  Auto-MailSystem: #B20F3A7299A1000FC2  



Sober.Z worm is detected with the following F-Secure Anti-Virus updates:

Detection Type: PC
Database: 2005-11-15_05

Description Details: Alexey Podrezov; November 16th, 2005


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