TROJ_CINMUS.MK


 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:

128,557 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

12 May 2015

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:

  • %Program Files%\Common Files\PushWare

(Note: %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.)

Autostart Technique

This Trojan registers itself as a BHO to ensure its automatic execution every time Internet Explorer is used by adding the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Helper Objects\{11F09AFE-75AD-4E52-AB43-E09E9351CE17}

Other System Modifications

This Trojan deletes the following files:

  • %User Temp%\nsc1.tmp

(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 adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\MicroPlugins\
Common

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
ContentMatch

HKEY_CLASSES_ROOT\NewCosoMediumPop.PopCoso.1

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
NewCosoMediumPop.PopCoso.1\CLSID

HKEY_CLASSES_ROOT\NewCosoMediumPop.PopCoso

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
NewCosoMediumPop.PopCoso\CLSID

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
NewCosoMediumPop.PopCoso\CurVer

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{CDE9EB54-A08E-4570-B748-13F5DDB5781C}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{CDE9EB54-A08E-4570-B748-13F5DDB5781C}\ProgID

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{CDE9EB54-A08E-4570-B748-13F5DDB5781C}\VersionIndependentProgID

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{CDE9EB54-A08E-4570-B748-13F5DDB5781C}\Programmable

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{CDE9EB54-A08E-4570-B748-13F5DDB5781C}\InprocServer32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{CDE9EB54-A08E-4570-B748-13F5DDB5781C}\TypeLib

HKEY_CLASSES_ROOT\NexyAdPopup.AYLogic.1

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
NexyAdPopup.AYLogic.1\CLSID

HKEY_CLASSES_ROOT\NexyAdPopup.AYLogic

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
NexyAdPopup.AYLogic\CLSID

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
NexyAdPopup.AYLogic\CurVer

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{11F09AFE-75AD-4E52-AB43-E09E9351CE17}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{11F09AFE-75AD-4E52-AB43-E09E9351CE17}\ProgID

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{11F09AFE-75AD-4E52-AB43-E09E9351CE17}\VersionIndependentProgID

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{11F09AFE-75AD-4E52-AB43-E09E9351CE17}\Programmable

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{11F09AFE-75AD-4E52-AB43-E09E9351CE17}\InprocServer32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{11F09AFE-75AD-4E52-AB43-E09E9351CE17}\TypeLib

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{DE2267BD-B163-407F-9E8D-6ADEC771E7AB}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{DE2267BD-B163-407F-9E8D-6ADEC771E7AB}\1.0

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{DE2267BD-B163-407F-9E8D-6ADEC771E7AB}\1.0\
FLAGS

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{DE2267BD-B163-407F-9E8D-6ADEC771E7AB}\1.0\
0

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{DE2267BD-B163-407F-9E8D-6ADEC771E7AB}\1.0\
0\win32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{DE2267BD-B163-407F-9E8D-6ADEC771E7AB}\1.0\
HELPDIR

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{0AD3AB16-6D0E-4F04-8660-FB1F36BC2DC0}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{0AD3AB16-6D0E-4F04-8660-FB1F36BC2DC0}\ProxyStubClsid

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{0AD3AB16-6D0E-4F04-8660-FB1F36BC2DC0}\ProxyStubClsid32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{0AD3AB16-6D0E-4F04-8660-FB1F36BC2DC0}\TypeLib

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{50C4CDD9-22D7-49FF-AC6D-7D4D528A3AB2}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{50C4CDD9-22D7-49FF-AC6D-7D4D528A3AB2}\ProxyStubClsid

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{50C4CDD9-22D7-49FF-AC6D-7D4D528A3AB2}\ProxyStubClsid32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{50C4CDD9-22D7-49FF-AC6D-7D4D528A3AB2}\TypeLib

HKEY_LOCAL_MACHINE\SOFTWARE\cpush

HKEY_LOCAL_MACHINE\SOFTWARE\cpush\
update

HKEY_CLASSES_ROOT\CLSID\{11F09AFD-75AD-4E51-AB43-E09E9351CE16}\
InprocServer32

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\MicroPlugins\
Common
param = "sid=ad"

HKEY_LOCAL_MACHINE\SOFTWARE\MicroPlugins\
Common
size = "1f9245"

HKEY_LOCAL_MACHINE\SOFTWARE\MicroPlugins\
Common
tlen = "2d86ae"

HKEY_LOCAL_MACHINE\SOFTWARE\MicroPlugins\
Common
backup = "1a52c5"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
ContentMatch
DisplayName = "AdPush Software"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
ContentMatch
UninstallString = "%Program Files%\Common Files\PushWare\Uninst.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\MicroPlugins\
Common
size = "1f44d"

HKEY_LOCAL_MACHINE\SOFTWARE\MicroPlugins\
Common
tlen = "2d6513"

HKEY_LOCAL_MACHINE\SOFTWARE\MicroPlugins\
Common
backup = "1a6a8"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{CDE9EB54-A08E-4570-B748-13F5DDB5781C}\InprocServer32
ThreadingModel = "apartment"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{11F09AFE-75AD-4E52-AB43-E09E9351CE17}\InprocServer32
ThreadingModel = "apartment"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{0AD3AB16-6D0E-4F04-8660-FB1F36BC2DC0}\TypeLib
Version = "1.0"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{50C4CDD9-22D7-49FF-AC6D-7D4D528A3AB2}\TypeLib
Version = "1.0"

HKEY_LOCAL_MACHINE\SOFTWARE\cpush\
update
Ad_Version = "1,2,5,2"

It deletes the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Helper Objects\{11F09AFD-75AD-4E51-AB43-E09E9351CE16}

Dropping Routine

This Trojan drops the following files:

  • %User Temp%\nsc3.tmp
  • %Program Files%\Common Files\PushWare\Uninst.exe
  • %Program Files%\Common Files\PushWare\cpush.dll

(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.. %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.)

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.750

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

Close all opened browser windows

Step 3

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\MicroPlugins
    • Common
  • In HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Uninstall
    • ContentMatch
  • In HKEY_CLASSES_ROOT
    • NewCosoMediumPop.PopCoso.1
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\NewCosoMediumPop.PopCoso.1
    • CLSID
  • In HKEY_CLASSES_ROOT
    • NewCosoMediumPop.PopCoso
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\NewCosoMediumPop.PopCoso
    • CLSID
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\NewCosoMediumPop.PopCoso
    • CurVer
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID
    • {CDE9EB54-A08E-4570-B748-13F5DDB5781C}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{CDE9EB54-A08E-4570-B748-13F5DDB5781C}
    • ProgID
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{CDE9EB54-A08E-4570-B748-13F5DDB5781C}
    • VersionIndependentProgID
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{CDE9EB54-A08E-4570-B748-13F5DDB5781C}
    • Programmable
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{CDE9EB54-A08E-4570-B748-13F5DDB5781C}
    • InprocServer32
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{CDE9EB54-A08E-4570-B748-13F5DDB5781C}
    • TypeLib
  • In HKEY_CLASSES_ROOT
    • NexyAdPopup.AYLogic.1
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\NexyAdPopup.AYLogic.1
    • CLSID
  • In HKEY_CLASSES_ROOT
    • NexyAdPopup.AYLogic
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\NexyAdPopup.AYLogic
    • CLSID
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\NexyAdPopup.AYLogic
    • CurVer
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID
    • {11F09AFE-75AD-4E52-AB43-E09E9351CE17}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{11F09AFE-75AD-4E52-AB43-E09E9351CE17}
    • ProgID
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{11F09AFE-75AD-4E52-AB43-E09E9351CE17}
    • VersionIndependentProgID
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{11F09AFE-75AD-4E52-AB43-E09E9351CE17}
    • Programmable
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{11F09AFE-75AD-4E52-AB43-E09E9351CE17}
    • InprocServer32
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{11F09AFE-75AD-4E52-AB43-E09E9351CE17}
    • TypeLib
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib
    • {DE2267BD-B163-407F-9E8D-6ADEC771E7AB}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{DE2267BD-B163-407F-9E8D-6ADEC771E7AB}
    • 1.0
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{DE2267BD-B163-407F-9E8D-6ADEC771E7AB}\1.0
    • FLAGS
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{DE2267BD-B163-407F-9E8D-6ADEC771E7AB}\1.0
    • 0
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{DE2267BD-B163-407F-9E8D-6ADEC771E7AB}\1.0\0
    • win32
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{DE2267BD-B163-407F-9E8D-6ADEC771E7AB}\1.0
    • HELPDIR
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface
    • {0AD3AB16-6D0E-4F04-8660-FB1F36BC2DC0}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{0AD3AB16-6D0E-4F04-8660-FB1F36BC2DC0}
    • ProxyStubClsid
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{0AD3AB16-6D0E-4F04-8660-FB1F36BC2DC0}
    • ProxyStubClsid32
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{0AD3AB16-6D0E-4F04-8660-FB1F36BC2DC0}
    • TypeLib
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface
    • {50C4CDD9-22D7-49FF-AC6D-7D4D528A3AB2}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{50C4CDD9-22D7-49FF-AC6D-7D4D528A3AB2}
    • ProxyStubClsid
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{50C4CDD9-22D7-49FF-AC6D-7D4D528A3AB2}
    • ProxyStubClsid32
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{50C4CDD9-22D7-49FF-AC6D-7D4D528A3AB2}
    • TypeLib
  • In HKEY_LOCAL_MACHINE\SOFTWARE
    • cpush
  • In HKEY_LOCAL_MACHINE\SOFTWARE\cpush
    • update
  • In HKEY_CLASSES_ROOT\CLSID\{11F09AFD-75AD-4E51-AB43-E09E9351CE16}
    • InprocServer32

Step 4

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\MicroPlugins\Common
    • param = "sid=ad"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\MicroPlugins\Common
    • size = "1f9245"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\MicroPlugins\Common
    • tlen = "2d86ae"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\MicroPlugins\Common
    • backup = "1a52c5"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\ContentMatch
    • DisplayName = "AdPush Software"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\ContentMatch
    • UninstallString = "%Program Files%\Common Files\PushWare\Uninst.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\MicroPlugins\Common
    • size = "1f44d"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\MicroPlugins\Common
    • tlen = "2d6513"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\MicroPlugins\Common
    • backup = "1a6a8"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{CDE9EB54-A08E-4570-B748-13F5DDB5781C}\InprocServer32
    • ThreadingModel = "apartment"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{11F09AFE-75AD-4E52-AB43-E09E9351CE17}\InprocServer32
    • ThreadingModel = "apartment"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{0AD3AB16-6D0E-4F04-8660-FB1F36BC2DC0}\TypeLib
    • Version = "1.0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{50C4CDD9-22D7-49FF-AC6D-7D4D528A3AB2}\TypeLib
    • Version = "1.0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\cpush\update
    • Ad_Version = "1,2,5,2"

Step 5

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.
  • %User Temp%\nsc3.tmp
  • %Program Files%\Common Files\PushWare\Uninst.exe
  • %Program Files%\Common Files\PushWare\cpush.dll

Step 6

Search and delete this folder

[ 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.
  • %Program Files%\Common Files\PushWare

Step 7

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

Step 8

Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.

  • %User Temp%\nsc1.tmp

Step 9

Restore these deleted registry keys/values from backup

*Note: Only Microsoft-related keys/values will be restored. If the malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.

  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects
    • {11F09AFD-75AD-4E51-AB43-E09E9351CE16}


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