TROJ_UPATRE.SMS

This malware is involved in a spam campaign that took place on December 2013, as a malicious attachment. Once opened, it connects to certain malicious URLs in order to download and execute malicious files onto the affected system. Affected users may find malicious routines being exhibited on their systems.

To get a one-glance comprehensive view of the behavior of this Trojan, refer to the Threat Diagram shown below.

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

It deletes the initially executed copy of itself.

Arrival Details

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This Trojan drops the following copies of itself into the affected system and executes them:

• %User Temp\budha.exe

Download Routine

This Trojan connects to the following website(s) to download and execute a malicious file:

• http://{BLOCKED}ame.com/wp-content/uploads/2009/06/pdf.enc
• http://{BLOCKED}rnia89.com/wp-content/uploads/2013/05/pdf.enc

It saves the files it downloads using the following names:

• %User Temp%\kilf.exe - TSPY_ZBOT.YDS

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

Other Details

This Trojan deletes the initially executed copy of itself