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PUA_CYFIN

August 02, 2017
 ALIASES:

Trojan.Gen.2 (Symantec); HEUR:RiskTool.AndroidOS.Agent.bv (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • 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.

  TECHNICAL DETAILS

File Size:

14,224,448 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

02 Aug 2017

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 creates the following folders:

  • %System Root%\DOCUME~1
  • %System Root%\DOCUME~1\Wilbert
  • %User Profile%\LOCALS~1
  • %User Temp%\RarSFX0
  • fwzs
  • fwzs\Bin
  • fwzs\Bin\download
  • fwzs\Bin\UI
  • fwzs\Bin\UI\JS
  • fwzs\Bin\UI\Style
  • fwzs\Bin\UI\Style\Css
  • fwzs\Bin\UI\Style\Images
  • %User Temp%\RarSFX0\fwzs\Bin\Log
  • %Start Menu%\Programs\·äÎÑÖúÊÖ
  • %Program Files%\fwzs\Bin\Log

(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.. %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.. %Start Menu% is the Start Menu folder, where it usually is C:\Documents and Settings\{user name}\Start Menu on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu 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.. %Program Files% is the Program Files folder, where it usually is C:\Program Files on all Windows operating system versions; C:\Program Files (x86) for 32-bit applications running on Windows 64-bit operating systems.)

Other System Modifications

This Trojan adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\fwzs\
Setup

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
fwzs

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\fwzs\
Setup
Path = "%Program Files%\fwzs"

HKEY_LOCAL_MACHINE\SOFTWARE\fwzs
USER_GUID = "577FAC55FA4CE9C1CBF8945A1516293B1200CE2932A65DCFEF41DB8A18571FF6"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
fwzs
DisplayIcon = "%Program Files%\fwzs\Bin\fwzs.exe "

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
fwzs
UninstallString = "%Program Files%\fwzs\Uninstall.exe "

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
fwzs
DisplayName = "·äÎÑÖúÊÖ"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
fwzs
DisplayVersion = "1.8.1.1034"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
fwzs
InstallLocation = "%Program Files%\fwzs\Bin\ "

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
fwzs
Publisher = "ÉϺ£´÷˼Èí¼þ¼¼ÊõÓÐÏÞ¹«Ë¾"

Dropping Routine

This Trojan drops the following files:

  • __tmp_rar_sfx_access_check_49921
  • fwzs\Bin\adbfwzs.exe
  • %User Temp%\RarSFX0\fwzs\Bin\adbfwzs.exe
  • fwzs\Bin\AdbWinApi.dll
  • fwzs\Bin\AdbWinUsbApi.dll
  • fwzs\Bin\app-release.apk
  • fwzs\Bin\appver.ini
  • fwzs\Bin\DataTranslate.dll
  • fwzs\Bin\Device.ini
  • fwzs\Bin\download\atl71.dll
  • %User Temp%\RarSFX0\fwzs\Bin\download\atl71.dll
  • fwzs\Bin\download\dl_peer_id.dll
  • fwzs\Bin\download\download_engine.dll
  • fwzs\Bin\download\id.dat
  • fwzs\Bin\download\MiniThunderPlatform.exe
  • fwzs\Bin\download\minizip.dll
  • fwzs\Bin\download\msvcp71.dll
  • fwzs\Bin\download\msvcr71.dll
  • fwzs\Bin\download\XLBugHandler.dll
  • fwzs\Bin\download\XLBugReport.exe
  • fwzs\Bin\download\zlib1.dll
  • fwzs\Bin\fwzs.exe
  • fwzs\Bin\InitCfg.dat
  • fwzs\Bin\msvcp100.dll
  • fwzs\Bin\msvcr100.dll
  • fwzs\Bin\PluginDataChannel.dll
  • fwzs\Bin\setup.exe
  • fwzs\Bin\SFWebStatistics.exe
  • fwzs\Bin\UI\DownManage.html
  • %User Temp%\RarSFX0\fwzs\Bin\UI\DownManage.html
  • fwzs\Bin\UI\EmuList.html
  • fwzs\Bin\UI\EmuManage.html
  • fwzs\Bin\UI\Index.html
  • fwzs\Bin\UI\JS\avalon.js
  • %User Temp%\RarSFX0\fwzs\Bin\UI\JS\avalon.js
  • fwzs\Bin\UI\JS\avalon.min.js
  • fwzs\Bin\UI\JS\cyjh.1.3.4.min.js
  • fwzs\Bin\UI\JS\cyjh.soft.1.0.min.js
  • fwzs\Bin\UI\JS\dowmmanage.min.js
  • fwzs\Bin\UI\JS\emulist.min.js
  • fwzs\Bin\UI\JS\emumanage.min.js
  • fwzs\Bin\UI\JS\index.min.js
  • fwzs\Bin\UI\JS\jquery.1.9.1.min.js
  • fwzs\Bin\UI\JS\share.min.js
  • fwzs\Bin\UI\Share.html
  • fwzs\Bin\UI\Style\Css\style.css
  • %User Temp%\RarSFX0\fwzs\Bin\UI\Style\Css\style.css
  • fwzs\Bin\UI\Style\Css\style.css.map
  • fwzs\Bin\UI\Style\Images\emuDown.gif
  • %User Temp%\RarSFX0\fwzs\Bin\UI\Style\Images\emuDown.gif
  • fwzs\Bin\UI\Style\Images\emuguide1.png
  • fwzs\Bin\UI\Style\Images\emuguide2.png
  • fwzs\Bin\UI\Style\Images\emuguide3.png
  • fwzs\Bin\UI\Style\Images\emuInstall.gif
  • fwzs\Bin\UI\Style\Images\errorbg.png
  • fwzs\Bin\UI\Style\Images\f-box-bg.png
  • fwzs\Bin\UI\Style\Images\guide.png
  • fwzs\Bin\UI\Style\Images\guide2.png
  • fwzs\Bin\UI\Style\Images\guide3.png
  • fwzs\Bin\UI\Style\Images\icon.gif
  • fwzs\Bin\UI\Style\Images\icon.png
  • fwzs\Bin\UI\Style\Images\icon.png.jscompress
  • fwzs\Bin\UI\Style\Images\imgError.png
  • fwzs\Bin\UI\Style\Images\itemLoad.gif
  • fwzs\Bin\UI\Style\Images\load.gif
  • fwzs\Bin\UI\Style\Images\loadError.png
  • fwzs\Bin\UI\Style\Images\search-bg.png
  • fwzs\Bin\UI\Style\Images\searchinpbg.png
  • fwzs\Bin\xldl.dll
  • fwzs\Uninstall.exe
  • %User Temp%\RarSFX0\fwzs\Bin\Log\FunctionSW.log
  • %Desktop%\·äÎÑÖúÊÖ.lnk
  • %Start Menu%\Programs\·äÎÑÖúÊÖ\Æô¶¯ ·äÎÑÖúÊÖ.lnk
  • %Start Menu%\Programs\·äÎÑÖúÊÖ\жÔØ ·äÎÑÖúÊÖ.lnk
  • %Program Files%\fwzs\Bin\Log\FunctionSW.log

(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.. %Desktop% is the desktop folder, where it usually is C:\Documents and Settings\{user name}\Desktop in Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\Desktop in 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.. %Start Menu% is the Start Menu folder, where it usually is C:\Documents and Settings\{user name}\Start Menu on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu 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.. %Program Files% is the Program Files folder, where it usually is C:\Program Files on all Windows operating system versions; C:\Program Files (x86) for 32-bit applications running on Windows 64-bit operating systems.)

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://api.{BLOCKED}t.fzcyjh.com
  • {BLOCKED}.21.116

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.8

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

Delete this registry key

[ Learn More ]

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\fwzs
    • Setup
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall
    • fwzs

Step 3

Delete this registry value

[ Learn More ]

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\fwzs\Setup
    • Path = "%Program Files%\fwzs"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\fwzs
    • USER_GUID = "577FAC55FA4CE9C1CBF8945A1516293B1200CE2932A65DCFEF41DB8A18571FF6"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\fwzs
    • DisplayIcon = "%Program Files%\fwzs\Bin\fwzs.exe "
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\fwzs
    • UninstallString = "%Program Files%\fwzs\Uninstall.exe "
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\fwzs
    • DisplayName = "·äÎÑÖúÊÖ"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\fwzs
    • DisplayVersion = "1.8.1.1034"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\fwzs
    • InstallLocation = "%Program Files%\fwzs\Bin\ "
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\fwzs
    • Publisher = "ÉϺ£´÷˼Èí¼þ¼¼ÊõÓÐÏÞ¹«Ë¾"

Step 4

Search and delete these components

[ Learn More ]
There may be some components that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • __tmp_rar_sfx_access_check_49921
  • fwzs\Bin\adbfwzs.exe
  • %User Temp%\RarSFX0\fwzs\Bin\adbfwzs.exe
  • fwzs\Bin\AdbWinApi.dll
  • fwzs\Bin\AdbWinUsbApi.dll
  • fwzs\Bin\app-release.apk
  • fwzs\Bin\appver.ini
  • fwzs\Bin\DataTranslate.dll
  • fwzs\Bin\Device.ini
  • fwzs\Bin\download\atl71.dll
  • %User Temp%\RarSFX0\fwzs\Bin\download\atl71.dll
  • fwzs\Bin\download\dl_peer_id.dll
  • fwzs\Bin\download\download_engine.dll
  • fwzs\Bin\download\id.dat
  • fwzs\Bin\download\MiniThunderPlatform.exe
  • fwzs\Bin\download\minizip.dll
  • fwzs\Bin\download\msvcp71.dll
  • fwzs\Bin\download\msvcr71.dll
  • fwzs\Bin\download\XLBugHandler.dll
  • fwzs\Bin\download\XLBugReport.exe
  • fwzs\Bin\download\zlib1.dll
  • fwzs\Bin\fwzs.exe
  • fwzs\Bin\InitCfg.dat
  • fwzs\Bin\msvcp100.dll
  • fwzs\Bin\msvcr100.dll
  • fwzs\Bin\PluginDataChannel.dll
  • fwzs\Bin\setup.exe
  • fwzs\Bin\SFWebStatistics.exe
  • fwzs\Bin\UI\DownManage.html
  • %User Temp%\RarSFX0\fwzs\Bin\UI\DownManage.html
  • fwzs\Bin\UI\EmuList.html
  • fwzs\Bin\UI\EmuManage.html
  • fwzs\Bin\UI\Index.html
  • fwzs\Bin\UI\JS\avalon.js
  • %User Temp%\RarSFX0\fwzs\Bin\UI\JS\avalon.js
  • fwzs\Bin\UI\JS\avalon.min.js
  • fwzs\Bin\UI\JS\cyjh.1.3.4.min.js
  • fwzs\Bin\UI\JS\cyjh.soft.1.0.min.js
  • fwzs\Bin\UI\JS\dowmmanage.min.js
  • fwzs\Bin\UI\JS\emulist.min.js
  • fwzs\Bin\UI\JS\emumanage.min.js
  • fwzs\Bin\UI\JS\index.min.js
  • fwzs\Bin\UI\JS\jquery.1.9.1.min.js
  • fwzs\Bin\UI\JS\share.min.js
  • fwzs\Bin\UI\Share.html
  • fwzs\Bin\UI\Style\Css\style.css
  • %User Temp%\RarSFX0\fwzs\Bin\UI\Style\Css\style.css
  • fwzs\Bin\UI\Style\Css\style.css.map
  • fwzs\Bin\UI\Style\Images\emuDown.gif
  • %User Temp%\RarSFX0\fwzs\Bin\UI\Style\Images\emuDown.gif
  • fwzs\Bin\UI\Style\Images\emuguide1.png
  • fwzs\Bin\UI\Style\Images\emuguide2.png
  • fwzs\Bin\UI\Style\Images\emuguide3.png
  • fwzs\Bin\UI\Style\Images\emuInstall.gif
  • fwzs\Bin\UI\Style\Images\errorbg.png
  • fwzs\Bin\UI\Style\Images\f-box-bg.png
  • fwzs\Bin\UI\Style\Images\guide.png
  • fwzs\Bin\UI\Style\Images\guide2.png
  • fwzs\Bin\UI\Style\Images\guide3.png
  • fwzs\Bin\UI\Style\Images\icon.gif
  • fwzs\Bin\UI\Style\Images\icon.png
  • fwzs\Bin\UI\Style\Images\icon.png.jscompress
  • fwzs\Bin\UI\Style\Images\imgError.png
  • fwzs\Bin\UI\Style\Images\itemLoad.gif
  • fwzs\Bin\UI\Style\Images\load.gif
  • fwzs\Bin\UI\Style\Images\loadError.png
  • fwzs\Bin\UI\Style\Images\search-bg.png
  • fwzs\Bin\UI\Style\Images\searchinpbg.png
  • fwzs\Bin\xldl.dll
  • fwzs\Uninstall.exe
  • %User Temp%\RarSFX0\fwzs\Bin\Log\FunctionSW.log
  • %Desktop%\·äÎÑÖúÊÖ.lnk
  • %Start Menu%\Programs\·äÎÑÖúÊÖ\Æô¶¯ ·äÎÑÖúÊÖ.lnk
  • %Start Menu%\Programs\·äÎÑÖúÊÖ\жÔØ ·äÎÑÖúÊÖ.lnk
  • %Program Files%\fwzs\Bin\Log\FunctionSW.log

Step 5

Search and delete these folders

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %System Root%\DOCUME~1
  • %System Root%\DOCUME~1\Wilbert
  • %User Profile%\LOCALS~1
  • %User Temp%\RarSFX0
  • fwzs
  • fwzs\Bin
  • fwzs\Bin\download
  • fwzs\Bin\UI
  • fwzs\Bin\UI\JS
  • fwzs\Bin\UI\Style
  • fwzs\Bin\UI\Style\Css
  • fwzs\Bin\UI\Style\Images
  • %User Temp%\RarSFX0\fwzs\Bin\Log
  • %Start Menu%\Programs\·äÎÑÖúÊÖ
  • %Program Files%\fwzs\Bin\Log

Step 6

Scan your computer with your Trend Micro product to delete files detected as PUA_CYFIN. 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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