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'.
Allow F-Secure Anti-Virus to disinfect the relevant files.
For more general information on disinfection, please see Removal Instructions.
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 ----
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
Description Created: Alexey Podrezov; November 16th, 2005