TROJ_UPATRE.YQU
TrojanDownloader:Win32/Upatre.O (Microsoft); Mal/Upatre-A (Sophos)
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
It is a malicious attachment related to a tax-themed spam campaign. The malware connects to malicious URLs to download an encrypted version of a ZBOT variant, which disables the antivirus products installed in the system.
To get a one-glance comprehensive view of the behavior of this Trojan, refer to the Threat Diagram shown below.
![](https://documents.trendmicro.com/images/troj_upatre_yqu.jpg)
This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.
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.
TECHNICAL DETAILS
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%\lsame.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 URL(s) to download its component file(s):
- http://vtiger.{BLOCKED}inc.com/test/logo/0804UKr.jpi - detected as TROJ_UPATRE.CFG
- http://{BLOCKED}inc.com/wp-content/uploads/2014/04/0804Ukr.jpi - inaccessible
It saves the files it downloads using the following names:
- %User Temp%\tislu.exe - detected as TSPY_ZBOT.YQU
(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
SOLUTION
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 the malware/grayware file dropped/downloaded by TROJ_UPATRE.YQU
- TSPY_ZBOT.YQU
Step 3
Search and delete this file
- %User Temp%\lsame.exe
Step 4
Scan your computer with your Trend Micro product to delete files detected as TROJ_UPATRE.YQU. 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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