UPS Invoice spam - New ZBot

May 29, 2009

SonicWALL UTM Research team observed a new wave of the UPS invoice spam campaign starting late Wednesday night, May 27, 2009. The email has a zip archived attachment which contains the new ZBot Trojan variant.

SonicWALL has received more than 1,500 e-mail copies of this malware till date. The e-mail looks like:

Attachment: (contains UPS_DOC_986001.exe) or (contains UPSEXL_GEN99012.exe)

Subject: Postal Tracking # [15-digit alpha-numeric number]

Email Body:

We were not able to deliver postal package you sent on the 14th of March in time because the recipient’s address is not correct.
Please print out the invoice copy attached and collect the package at our office.

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:

  • Creates a directory (Windows System Folder)wbem
  • Drops a copy of itself as (Windows System Folder)wbemgrpconv.exe
  • Deletes the original file

It tires to connect to domain and sends following HTTP request to it:


The Trojan is also known as trojan W32/Trojan3.AXD [F-Secure], Win32/Agent.PMJ trojan [ESET], and trojan [McAfee]

SonicWALL Gateway AntiVirus provides protection against this malware via GAV: Zbot.JFG (Trojan) and GAV: Zbot.JFA (Trojan) signature.