UPS Invoice spam - Bredolab.X Trojan

SonicWALL UTM Research team observed a new wave of the UPS invoice spam campaign starting today morning. The email has a zip archived attachment which contains the new Bredolab Trojan variant.

SonicWALL has received more than 4,000 e-mail copies of this malware so far. The e-mail looks like:

Attachment:

• UPSNR_7a04d392.zip (contains UPSNR_7a04d392.exe)
• UPSNR_05fa2628.zip (contains UPSNR_05fa2628.exe)
• UPSNR_8d1cb9a4.zip (contains UPSNR_8d1cb9a4.exe)

Subject: UPS Tracking Number [7-digit alpha-numeric number]

Email Body:
------------------------
Dear customer!

We were not able to deliver postal package you have sent on the 9th of July in time because the addressee's address is erroneous.
Please print out the invoice copy attached and collect the package at our department.

Your United Parcel Service of America
------------------------

The e-mail message looks like below:

The executable file inside the zip attachment has an icon disguised as a Microsoft Excel sheet file:

The Trojan when executed performs following host level activity:

• Drops a copy of itself as (Windows System Folder)Startupdfqupd32.exe
• Deletes the original file

It tires to connect to mudstrang.ru domain and downloads an encrypted configuration file via following HTTP request to it:

• GET /def/controller.php?action=bot&entity_list=&uid=&first=1&guid=615903122&v=15&rnd=8520045

The Trojan is also known as trojan Mal/Bredo-A [Sophos] and TR/Crypt.ZPACK.Gen [AntiVir].

SonicWALL Gateway AntiVirus provides protection against this malware via GAV: Bredolab.X (Trojan) signature.[4,379,258 hits recorded starting August 5, 2009].