TROJ_UPATRE.YKS
Trojan-Downloader.Win32.Upatre.vpj (Kaspersky)
Windows
Threat Type: Trojan
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.
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%\Optsetup.exe
(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)
It terminates the execution of the copy it initially executed and executes the copy it drops instead.
Download Routine
This Trojan accesses the following websites to download files:
- http://{BLOCKED}ntalongaku.com/images/wicon4.png
Other Details
This Trojan deletes the initially executed copy of itself
NOTES:
The Trojan decrypts the downloaded binary and saves them as the following files:
- %User Temp% as {letters}{2digits}.exe - detected as TROJ_DYRE.YKS
- %User Temp%\temp14.pdf - normal PDF
It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.
It also accesses the following URLs to send information:
- http://{BLOCKED}1.{BLOCKED}5.141.87:13845/2603uk12/{computername}/0/{OS Version}-{Service Pack}/0/
The following information are posted:
- Computer name
- Operating system version
- Service pack installed
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 that dropped/downloaded TROJ_UPATRE.YKS. (Note: Please skip this step if the threat(s) listed below have already been removed.)
-
TSPY_DYRE.YKS
Step 3
Identify and terminate files detected as TROJ_UPATRE.YKS
- Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
- If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
- If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.
Step 4
Search and delete this file
Step 5
Scan your computer with your Trend Micro product to delete files detected as TROJ_UPATRE.YKS. 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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