PUA.Win32.Somoto.YQIOVO
BrowserModifier:Win32/DeepSync (Microsoft); HEUR:AdWare.MSIL.Syncapad.gen (Kaspersky)
Windows
Threat Type: Potentially Unwanted Application
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This Potentially Unwanted Application arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
TECHNICAL DETAILS
Arrival Details
This Potentially Unwanted Application 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 Potentially Unwanted Application drops the following files:
- %User Temp%\IXP000.TMP\TMP{random numbers}$.TMP
- %User Temp%\IXP000.TMP\AppSync.exe
- %User Temp%\IXP000.TMP\config.txt
- %User Temp%\IXP000.TMP\pref.txt
- %User Temp%\IXP000.TMP\brand.js
- %User Temp%\IXP000.TMP\AppSync.exe.config
- %User Temp%\IXP000.TMP\PdfPro100.ico
- %User Temp%\IXP000.TMP\1517130957005_490x60.png
- %User Temp%\IXP000.TMP\1517143390278_1512482433840_logo.png
- %User Temp%\IXP000.TMP\alert-icon.png
- %User Temp%\IXP000.TMP\bg.jpg
- %User Temp%\IXP000.TMP\install.css
- %User Temp%\IXP000.TMP\install.html
- %User Temp%\IXP000.TMP\install.js
- %User Temp%\IXP000.TMP\jquery-3.2.1.slim.min.js
- %User Temp%\IXP000.TMP\loader.gif
- %User Temp%\IXP000.TMP\logo.png
- %User Temp%\IXP000.TMP\retake.css
- %User Temp%\IXP000.TMP\retake.html
- %User Temp%\IXP000.TMP\retake.js
- %User Temp%\IXP000.TMP\spinner.gif
- %User Temp%\IXP000.TMP\uninstall.css
- %User Temp%\IXP000.TMP\uninstall.html
- %User Temp%\IXP000.TMP\uninstall.js
- %User Temp%\IXP000.TMP\win10_install.css
- %User Temp%\IXP000.TMP\win10_install.html
- %User Temp%\IXP000.TMP\win10_install.js
(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(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)
It adds the following processes:
- %User Temp%\IXP000.TMP\AppSync.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(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)
Autostart Technique
This Potentially Unwanted Application adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\RunOnce
wextract_cleanup0 = "rundll32.exe %System%\advpack.dll,DelNodeRunDLL32 "%User Temp%\IXP000.TMP\""
SOLUTION
Step 1
Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 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
Restart in Safe Mode
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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce
- wextract_cleanup0 = rundll32.exe %System%\advpack.dll,DelNodeRunDLL32 %User Temp%\IXP000.TMP\
Step 5
Search and delete this file
- %User Temp%\IXP000.TMP\TMP4351$.TMP
- %User Temp%\IXP000.TMP\AppSync.exe
- %User Temp%\IXP000.TMP\config.txt
- %User Temp%\IXP000.TMP\pref.txt
- %User Temp%\IXP000.TMP\brand.js
- %User Temp%\IXP000.TMP\AppSync.exe.config
- %User Temp%\IXP000.TMP\PdfPro100.ico
- %User Temp%\IXP000.TMP\1517130957005_490x60.png
- %User Temp%\IXP000.TMP\1517143390278_1512482433840_logo.png
- %User Temp%\IXP000.TMP\alert-icon.png
- %User Temp%\IXP000.TMP\bg.jpg
- %User Temp%\IXP000.TMP\install.css
- %User Temp%\IXP000.TMP\install.html
- %User Temp%\IXP000.TMP\install.js
- %User Temp%\IXP000.TMP\jquery-3.2.1.slim.min.js
- %User Temp%\IXP000.TMP\loader.gif
- %User Temp%\IXP000.TMP\logo.png
- %User Temp%\IXP000.TMP\retake.css
- %User Temp%\IXP000.TMP\retake.html
- %User Temp%\IXP000.TMP\retake.js
- %User Temp%\IXP000.TMP\spinner.gif
- %User Temp%\IXP000.TMP\uninstall.css
- %User Temp%\IXP000.TMP\uninstall.html
- %User Temp%\IXP000.TMP\uninstall.js
- %User Temp%\IXP000.TMP\win10_install.css
- %User Temp%\IXP000.TMP\win10_install.html
- %User Temp%\IXP000.TMP\win10_install.js
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as PUA.Win32.Somoto.YQIOVO. 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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