TROJ_UPATRE.YYSLD
TrojanDownloader:Win32/Upatre (Microsoft), Trojan-Downloader.Win32.Upatre.axyt (Kaspersky), W32/Waski.F!tr (Fortinet)
Windows
Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
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 does not have any propagation routine.
It does not have any backdoor routine.
It deletes the initially executed copy of itself.
TECHNICAL DETAILS
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:
- %User Temp%\Mivinad.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%\Mivi-738.log → contains the initially executed malware path, which is overwritten once it downloads
(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.)
Propagation
This Trojan does not have any propagation routine.
Backdoor Routine
This Trojan does not have any backdoor routine.
Download Routine
This Trojan connects to the following website(s) to download and execute a malicious file:
- https://{BLOCKED}.{BLOCKED}.93.250/j11.zip
- https://{BLOCKED}.{BLOCKED}.25.40/j11.zip
- https://{BLOCKED}.{BLOCKED}.236.173/j11.zip
- https://{BLOCKED}.{BLOCKED}.106.143/j11.zip
- https://{BLOCKED}.{BLOCKED}.25.136/j11.zip
- https://{BLOCKED}.{BLOCKED}.61.218/j11.zip
- https://{BLOCKED}.{BLOCKED}.63.33/j11.zip
- https://{BLOCKED}.{BLOCKED}.223.219/j11.zip
- https://{BLOCKED}.{BLOCKED}.124.76/j11.zip
- https://{BLOCKED}.{BLOCKED}.171.44/j11.zip
- https://{BLOCKED}.{BLOCKED}.130.24/j11.zip
- https://{BLOCKED}.{BLOCKED}173.27/j11.zip
- https://{BLOCKED}.{BLOCKED}248.137/j11.zip
- https://{BLOCKED}.{BLOCKED}.92.4/j11.zip
- https://{BLOCKED}.{BLOCKED}.81.120/j11.zip
- https://{BLOCKED}.{BLOCKED}.124.231/j11.zip
- https://{BLOCKED}.{BLOCKED}.204.12/j11.zip
- https://{BLOCKED}.{BLOCKED}.64.184/j11.zip
- https://{BLOCKED}.{BLOCKED}.210.27/j11.zip
It saves the files it downloads using the following names:
- %User Temp%\Mivi-738.log → now contains the downloaded compress code
(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.)
Information Theft
This Trojan gathers the following data:
- Computer Name
- OS version
- Service Pack
Other Details
This Trojan connects to the following URL(s) to get the affected system's IP address:
- http://icanhazip.com/
It does the following:
- Decompresses the downloaded binary code %User Temp%\Mivi-738.log to drop and execute the file %User Temp%\{random file name}.exe - detected as TSPY_DYRE.SLD
- Installs authentication certificates to enable access of download sites
(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 deletes the initially executed copy of itself
NOTES:
This Trojan connects to the following URLs to report infection of the affected system:
- http://{BLOCKED}.{BLOCKED}.194.101:{port}/AMG11/{Host Name}/0/{OS Version}-{Service Pack}/0/{value}
- http://{BLOCKED}.{BLOCKED}.194.101:{port}/AMG11/{Host Name}/{data}
The value {port} can be any of the following:
- 13100
- 13101
- 13102
- 13103
It does not have rootkit capabilities.
It does not exploit any vulnerability.
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
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
Remove malware/grayware files dropped/downloaded by TROJ_UPATRE.YYSLD. (Note: Please skip this step if the threats listed below have already been removed.)
- TSPY_DYRE.SLD
Step 4
Search and delete this file
- %User Temp%\Mivi-738.log
Step 5
Scan your computer with your Trend Micro product to delete files detected as TROJ_UPATRE.YYSLD. 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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