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TROJ_UPATRE.SMAI
Aliases: TrojanDownloader:Win32/Upatre.G(Microsoft), Downloader.Upatre(Symantec), Trojan.Win32.Upatre.jr (v)(Sunbelt), Trojan-Downloader.Win32.Upatre(Ikarus), Win32/TrojanDownloader.Waski.A trojan(Eset)
Malware type: Trojan
Destructive: No
Platform: Windows 2000, Windows XP, Windows Server 2003,Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
Encrypted: Yes
In the wild: Yes

Overview


Infection Channel: Spammed via email

This malware arrives as an unusual malicious attachment. It displays a fake and malicious error message when uncompressed and executed.

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.

As of this writing, the said sites are inaccessible.

It deletes itself after execution.

Technical Details


File size: 17,920 bytes
File type: EXE
Memory resident: No
Initial samples received date: 11 Jan 2014
Payload: Connects to URLs/IPs, Downloads files

Arrival Details

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

Installation

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

  • %User Temp%\ieupdater.exe

(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.)

Download Routine

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

  • https://{BLOCKED}headnails.com/wp-content/uploads/2011/10/pdf.exe

It saves the files it downloads using the following names:

  • %User Temp%\jenif.exe - detected as TSPY_ZBOT.ADXK

(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.)

As of this writing, the said sites are inaccessible.

Other Details

This Trojan deletes itself after execution.

NOTES:

This Trojan executes successfully if the current month of the infected machine is January.

Solution


Minimum scan engine: 9.700
First VSAPI Pattern File: 10.538.06
First VSAPI Pattern Release Date: 13 Jan 2014
VSAPI OPR Pattern Version: 10.539.00
VSAPI OPR Pattern Release Date: 14 Jan 2014

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Remove malware/grayware files dropped/downloaded by TROJ_UPATRE.SMAI

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_UPATRE.SMAI. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.


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Analysis By: Automation
Modified By: Rika Joi Gregorio

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