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TROJ_COINMINE.WF

February 21, 2014
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 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:

2,655,785 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

21 Feb 2014

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:

  • %User Temp%\is-MGSAK.tmp
  • %User Temp%\is-IO29R.tmp
  • %User Temp%\is-IO29R.tmp\_isetup
  • %Program Files%\uTorrent 3.2.0 2756
  • %Windows%\inf\msvydcv
  • %Windows%\inf\msvydcv\bitstreams
  • %Start Menu%\Programs\uTorrent 3.2.0 2756

(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, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).. %Windows% is the Windows folder, which is usually C:\Windows.. %Start Menu% is the current user's Start Menu folder, which is usually C:\Windows\Start Menu or C:\Documents and Settings\{User name}\Start Menu on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu on Windows Vista and 7.)

Autostart Technique

This Trojan adds the following registry entries to enable its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
NtVdmSrv = "%Windows%\inf\ntvdm.vbe"

Other System Modifications

This Trojan deletes the following files:

  • %Start Menu%\Programs\uTorrent 3.2.0 2756\uTorrent 3.2.0 2756.pif
  • %Start Menu%\Programs\uTorrent 3.2.0 2756\uTorrent 3.2.0 2756.url

(Note: %Start Menu% is the current user's Start Menu folder, which is usually C:\Windows\Start Menu or C:\Documents and Settings\{User name}\Start Menu on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu on Windows Vista and 7.)

It adds the following registry keys:

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
{C2B72798-9B90-BF2B-954D-2C487BA92637}_is1

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
{C2B72798-9B90-BF2B-954D-2C487BA92637}_is1
Inno Setup: Setup Version = "5.5.3 (a)"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
{C2B72798-9B90-BF2B-954D-2C487BA92637}_is1
Inno Setup: App Path = "%Program Files%\uTorrent 3.2.0 2756"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
{C2B72798-9B90-BF2B-954D-2C487BA92637}_is1
InstallLocation = "%Program Files%\uTorrent 3.2.0 2756"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
{C2B72798-9B90-BF2B-954D-2C487BA92637}_is1
Inno Setup: Icon Group = "uTorrent 3.2.0 2756"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
{C2B72798-9B90-BF2B-954D-2C487BA92637}_is1
Inno Setup: User = "Wilbert"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
{C2B72798-9B90-BF2B-954D-2C487BA92637}_is1
Inno Setup: Deselected Tasks = "desktopicon,quicklaunchicon"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
{C2B72798-9B90-BF2B-954D-2C487BA92637}_is1
Inno Setup: Language = "english"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
{C2B72798-9B90-BF2B-954D-2C487BA92637}_is1
DisplayName = "uTorrent 3.2.0 2756 version for Windows"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
{C2B72798-9B90-BF2B-954D-2C487BA92637}_is1
UninstallString = "%Program Files%\uTorrent 3.2.0 2756\unins000.exe "

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
{C2B72798-9B90-BF2B-954D-2C487BA92637}_is1
QuietUninstallString = "%Program Files%\uTorrent 3.2.0 2756\unins000.exe /SILENT"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
{C2B72798-9B90-BF2B-954D-2C487BA92637}_is1
DisplayVersion = "for Windows"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
{C2B72798-9B90-BF2B-954D-2C487BA92637}_is1
NoModify = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
{C2B72798-9B90-BF2B-954D-2C487BA92637}_is1
NoRepair = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
{C2B72798-9B90-BF2B-954D-2C487BA92637}_is1
InstallDate = "20140127"

It deletes the following registry keys:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
{C2B72798-9B90-BF2B-954D-2C487BA92637}_is1

Dropping Routine

This Trojan drops the following files:

  • %User Temp%\is-mgsak.tmp\{malware file name}.tmp
  • %User Temp%\is-IO29R.tmp\_isetup\_shfoldr.dll
  • %Program Files%\uTorrent 3.2.0 2756\unins000.dat
  • %Program Files%\uTorrent 3.2.0 2756\is-3CLG7.tmp
  • %Program Files%\uTorrent 3.2.0 2756\is-741KB.tmp
  • %Windows%\inf\msvydcv\is-0N2U4.tmp
  • %Windows%\inf\msvydcv\is-HA8P9.tmp
  • %Windows%\inf\msvydcv\is-50AKC.tmp
  • %Windows%\inf\msvydcv\is-MOIS2.tmp
  • %Windows%\inf\msvydcv\is-VBV3N.tmp
  • %Windows%\inf\msvydcv\is-HOJG7.tmp
  • %Windows%\inf\msvydcv\is-K0LE3.tmp
  • %Windows%\inf\msvydcv\is-DSIVL.tmp
  • %Windows%\inf\msvydcv\is-CEI4O.tmp
  • %Windows%\inf\msvydcv\is-3TF0E.tmp
  • %Windows%\inf\msvydcv\is-PRCM5.tmp
  • %Windows%\inf\msvydcv\is-N5BQT.tmp
  • %Windows%\inf\msvydcv\is-UT5C0.tmp
  • %Windows%\inf\msvydcv\bitstreams\is-QJ1VL.tmp
  • %Windows%\inf\msvydcv\bitstreams\is-D19P9.tmp
  • %Windows%\inf\msvydcv\bitstreams\is-LBKDI.tmp
  • %Windows%\inf\msvydcv\bitstreams\is-NB3O6.tmp
  • %Windows%\inf\msvydcv\bitstreams\is-EGR7L.tmp
  • %Windows%\inf\msvydcv\bitstreams\is-DPEO7.tmp
  • %Windows%\inf\msvydcv\bitstreams\is-OBERB.tmp
  • %Windows%\inf\msvydcv\bitstreams\is-70FS3.tmp
  • %Windows%\inf\msvydcv\is-N9VM5.tmp
  • %Windows%\inf\is-GPC7O.tmp
  • %Windows%\inf\is-OT6C0.tmp
  • %Start Menu%\Programs\uTorrent 3.2.0 2756\uTorrent 3.2.0 2756.lnk

(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, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).. %Windows% is the Windows folder, which is usually C:\Windows.. %Start Menu% is the current user's Start Menu folder, which is usually C:\Windows\Start Menu or C:\Documents and Settings\{User name}\Start Menu on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu on Windows Vista and 7.)

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.300

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

Restart in Safe Mode

[ Learn More ]

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\Microsoft\Windows\CurrentVersion\Uninstall
    • {C2B72798-9B90-BF2B-954D-2C487BA92637}_is1

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\Microsoft\Windows\CurrentVersion\Run
    • NtVdmSrv = "%Windows%\inf\ntvdm.vbe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{C2B72798-9B90-BF2B-954D-2C487BA92637}_is1
    • Inno Setup: Setup Version = "5.5.3 (a)"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{C2B72798-9B90-BF2B-954D-2C487BA92637}_is1
    • Inno Setup: App Path = "%Program Files%\uTorrent 3.2.0 2756"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{C2B72798-9B90-BF2B-954D-2C487BA92637}_is1
    • InstallLocation = "%Program Files%\uTorrent 3.2.0 2756"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{C2B72798-9B90-BF2B-954D-2C487BA92637}_is1
    • Inno Setup: Icon Group = "uTorrent 3.2.0 2756"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{C2B72798-9B90-BF2B-954D-2C487BA92637}_is1
    • Inno Setup: User = "Wilbert"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{C2B72798-9B90-BF2B-954D-2C487BA92637}_is1
    • Inno Setup: Deselected Tasks = "desktopicon,quicklaunchicon"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{C2B72798-9B90-BF2B-954D-2C487BA92637}_is1
    • Inno Setup: Language = "english"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{C2B72798-9B90-BF2B-954D-2C487BA92637}_is1
    • DisplayName = "uTorrent 3.2.0 2756 version for Windows"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{C2B72798-9B90-BF2B-954D-2C487BA92637}_is1
    • UninstallString = "%Program Files%\uTorrent 3.2.0 2756\unins000.exe "
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{C2B72798-9B90-BF2B-954D-2C487BA92637}_is1
    • QuietUninstallString = "%Program Files%\uTorrent 3.2.0 2756\unins000.exe /SILENT"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{C2B72798-9B90-BF2B-954D-2C487BA92637}_is1
    • DisplayVersion = "for Windows"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{C2B72798-9B90-BF2B-954D-2C487BA92637}_is1
    • NoModify = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{C2B72798-9B90-BF2B-954D-2C487BA92637}_is1
    • NoRepair = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{C2B72798-9B90-BF2B-954D-2C487BA92637}_is1
    • InstallDate = "20140127"

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%\is-mgsak.tmp\{malware file name}.tmp
  • %User Temp%\is-IO29R.tmp\_isetup\_shfoldr.dll
  • %Program Files%\uTorrent 3.2.0 2756\unins000.dat
  • %Program Files%\uTorrent 3.2.0 2756\is-3CLG7.tmp
  • %Program Files%\uTorrent 3.2.0 2756\is-741KB.tmp
  • %Windows%\inf\msvydcv\is-0N2U4.tmp
  • %Windows%\inf\msvydcv\is-HA8P9.tmp
  • %Windows%\inf\msvydcv\is-50AKC.tmp
  • %Windows%\inf\msvydcv\is-MOIS2.tmp
  • %Windows%\inf\msvydcv\is-VBV3N.tmp
  • %Windows%\inf\msvydcv\is-HOJG7.tmp
  • %Windows%\inf\msvydcv\is-K0LE3.tmp
  • %Windows%\inf\msvydcv\is-DSIVL.tmp
  • %Windows%\inf\msvydcv\is-CEI4O.tmp
  • %Windows%\inf\msvydcv\is-3TF0E.tmp
  • %Windows%\inf\msvydcv\is-PRCM5.tmp
  • %Windows%\inf\msvydcv\is-N5BQT.tmp
  • %Windows%\inf\msvydcv\is-UT5C0.tmp
  • %Windows%\inf\msvydcv\bitstreams\is-QJ1VL.tmp
  • %Windows%\inf\msvydcv\bitstreams\is-D19P9.tmp
  • %Windows%\inf\msvydcv\bitstreams\is-LBKDI.tmp
  • %Windows%\inf\msvydcv\bitstreams\is-NB3O6.tmp
  • %Windows%\inf\msvydcv\bitstreams\is-EGR7L.tmp
  • %Windows%\inf\msvydcv\bitstreams\is-DPEO7.tmp
  • %Windows%\inf\msvydcv\bitstreams\is-OBERB.tmp
  • %Windows%\inf\msvydcv\bitstreams\is-70FS3.tmp
  • %Windows%\inf\msvydcv\is-N9VM5.tmp
  • %Windows%\inf\is-GPC7O.tmp
  • %Windows%\inf\is-OT6C0.tmp
  • %Start Menu%\Programs\uTorrent 3.2.0 2756\uTorrent 3.2.0 2756.lnk

Step 6

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.
  • %User Temp%\is-MGSAK.tmp
  • %User Temp%\is-IO29R.tmp
  • %User Temp%\is-IO29R.tmp\_isetup
  • %Program Files%\uTorrent 3.2.0 2756
  • %Windows%\inf\msvydcv
  • %Windows%\inf\msvydcv\bitstreams
  • %Start Menu%\Programs\uTorrent 3.2.0 2756

Step 7

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_COINMINE.WF. 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.

  • %Start Menu%\Programs\uTorrent 3.2.0 2756\uTorrent 3.2.0 2756.pif
  • %Start Menu%\Programs\uTorrent 3.2.0 2756\uTorrent 3.2.0 2756.url

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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall
    • {C2B72798-9B90-BF2B-954D-2C487BA92637}_is1


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