TROJ_UPATRE.YSLB
TrojanDownloader:Win32/Upatre!rfn (Microsoft); Trojan-Downloader.Win32.Upatre.azug (Kaspersky); Downloader.Upatre!gen5 (Symantec)
Windows
Threat Type: Trojan
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
Downloaded from the Internet
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
37,376 bytes
EXE
No
11 Jun 2015
Connects to URLs/IPs, 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:
- %User Temp%\Gycijaba.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%\Gyci7EC9.txt ← 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.)
Other System Modifications
This Trojan adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\CurrentVersion
kereruthjertr456 = 1
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 URL(s) to download its component file(s):
- https://{BLOCKED}.32.124.231/ua.png
- https://{BLOCKED}.105.248.137/ua.png
- https://{BLOCKED}.132.173.27/ua.png
- https://{BLOCKED}.84.81.120/ua.png
- https://{BLOCKED}.28.92.4/ua.png
- https://{BLOCKED}.74.106.143/ua.png
- https://{BLOCKED}.191.25.136/ua.png
- https://{BLOCKED}.222.64.184/ua.png
- https://{BLOCKED}.144.171.44/ua.png
- https://{BLOCKED}.33.236.173/ua.png
- https://{BLOCKED}.227.223.219/ua.png
- https://{BLOCKED}.37.204.12/ua.png
- https://{BLOCKED}.196.63.33/ua.png
- https://{BLOCKED}.142.124.76/ua.png
- https://{BLOCKED}6.16.93.250/ua.png
- https://{BLOCKED}.19.25.40/ua.png
- https://{BLOCKED}.246.210.27/ua.png
- https://{BLOCKED}.196.61.218/ua.png
- https://{BLOCKED}.99.130.24/ua.png
It saves the files it downloads using the following names:
- %User Temp%\Gyci7EC9.txt
(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.)
Other Details
This Trojan connects to the following URL(s) to get the affected system's IP address:
- http://icanhazip.com/
It deletes the initially executed copy of itself
NOTES:
It decompresses the binary code from %User Temp%\Gyci7EC9.txt and drops and executes the following file:
- %User Temp%\{random filename}.exe - detected as TSPY_DYRE.YYSLB
It connects to the following URL to report infection of the affected system:
- http://{BLOCKED}8.{BLOCKED}0.194.101:{port}/UAM/{computer name}/0/{os version info}/0/{encrypted IP address}
- http://{BLOCKED}8.{BLOCKED}0.194.101:{port}/UAM/{computer name}/{value}/{value}/{value}
where {port} can be 13096,13097,13098 or 13099
It reports the following information of the affected system:
- Computer Name
- OS version information
It does not have rootkit capabilities.
It does not exploit any vulnerability.
SOLUTION
9.750
11.750.02
24 Jun 2015
11.751.00
25 Jun 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
Remove malware/grayware files dropped/downloaded by TROJ_UPATRE.YSLB. (Note: Please skip this step if the threats listed below have already been removed.)
- TSPY_DYRE.YYSLB
Step 4
Delete this registry value
Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.
- In HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion
- kereruthjertr456 = 1
- kereruthjertr456 = 1
Step 5
Search and delete this file
- %User Temp%\Gyci7EC9.txt
Step 6
Scan your computer with your Trend Micro product to delete files detected as TROJ_UPATRE.YSLB. 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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