TROJ_UPATRE.SMJK
Trojan-Downloader.Win32.Upatre.het (Kaspersky), Downloader.Upatre!gen5 (Norton)
Windows
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Trojan
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
Downloaded from the Internet, Dropped by other malware
This Trojan 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. As of this writing, the said sites are inaccessible.
It deletes the initially executed copy of itself.
TECHNICAL DETAILS
32,768 bytes
EXE
No
08 May 2015
Downloads files
Arrival Details
This Trojan 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%\prityviewer.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 drops the following files:
- %User Temp%\PRTY8D97.txt - Initially Contains malware file path and filename, then will be replaced by the downloaded encrypted data.
(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.)
Download Routine
This Trojan connects to the following website(s) to download and execute a malicious file:
- {BLOCKED}.{BLOCKED}.169.187/wosb12.pdf
- {BLOCKED}.{BLOCKED}.34.130/wosb12.pdf
- {BLOCKED}.{BLOCKED}.240.56/wosb12.pdf
- {BLOCKED}.{BLOCKED}.102.76/wosb12.pdf
- {BLOCKED}.{BLOCKED}.226.85/wosb12.pdf
- {BLOCKED}.{BLOCKED}.169.178/wosb12.pdf
- {BLOCKED}.{BLOCKED}.202.3/wosb12.pdf
- {BLOCKED}.{BLOCKED}.202.197/wosb12.pdf
- {BLOCKED}.{BLOCKED}.234.86/wosb12.pdf
- {BLOCKED}.{BLOCKED}.155.3/wosb12.pdf
- {BLOCKED}.{BLOCKED}.211.242/wosb12.pdf
It saves the files it downloads using the following names:
- %User Temp%\{random}.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 then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.
As of this writing, the said sites are inaccessible.
Information Theft
This Trojan gathers the following data:
- Computer name
- Operating system version
- Service pack installed
Other Details
This Trojan connects to the following URL(s) to get the affected system's IP address:
- icanhazip.com
It does the following:
- It connects to the following URLs to report infection of the affected system:
- http://{BLOCKED}.{BLOCKED}.17.201:{port}/WSB22/{host's name}/{number}/{OS Version}-{Service Packed Installed}/{number}/
Where {port} can be any of the following:- 13444
- 13445
- 13446
- 13447
It deletes the initially executed copy of itself
SOLUTION
9.750
11.640.06
30 Apr 2015
11.641.00
01 May 2015
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
Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.
Step 3
Search and delete these files
- %User Temp%\PRTY8D97.txt
- %User Temp%\{random}.exe
Step 4
Scan your computer with your Trend Micro product to delete files detected as TROJ_UPATRE.SMJK. 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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