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Win32.Sobig.B@mm (Palyh)

First posted on 21 November 2011.
Source: BitDefender

Aliases :

Win32.Sobig.B@mm (Palyh) is also known as Win32.Sobig.(A,B.

Explanation :

This mass mailer spreads itself via email, as an attatched file with one of the following names:
your_details.pif
ref-394755.pif
approved.pif
password.pif
doc_details.pif
screen_temp.pif
screen_doc.pif
movie28.pif
application.pif

The email is fakely sent from support@microsoft.com, has "All information is in the attached file." in body, and the subject is one of the following:
Your details
Approved (Ref: 38446-263)
Re: Approved (Ref: 3394-65467)
Your password
Re: My details
Screensaver
Cool screensaver
Re: Movie
Re: My application

Once executed the malware copyes itself in %windows% (i.e. C:WINNT) and gives control to that copy. It searches the whole hard disk for email addresses contained in files with the following extensions: wab, dbx, htm, html, eml, txt.

Starting with 31st of May 2003 the worm stops spreading but it still infects the machine where it is executed.
The virus has been renamed from Win32.Palyh.A@mm into Win32.SoBig.B@mm, as it belongs to the SoBig family.

Last update 21 November 2011

 

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