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TROJ_CRILOCK.YNK

December 06, 2014
 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:

276,992 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

21 Nov 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:

  • %System Root%\wntmpg

(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)

Other System Modifications

This Trojan deletes the following files:

  • %User Profile%\Sample Pictures\Blue hills.jpg
  • %User Profile%\Sample Pictures\Sunset.jpg
  • %User Profile%\Sample Pictures\Water lilies.jpg
  • %User Profile%\Sample Pictures\Winter.jpg
  • %User Profile%\Internet Explorer\brndlog.txt
  • %Application Data%\Microsoft\Windows Media\9.0\WMSDKNS.XML
  • %User Profile%\Templates\excel.xls
  • %User Profile%\Templates\excel4.xls
  • %User Profile%\Templates\powerpnt.ppt
  • %User Profile%\Templates\winword.doc
  • %User Profile%\Templates\winword2.doc
  • %User Temp%\dd_depcheck_NETFX_EXP_35.txt
  • %User Temp%\dd_dotnetfx35error.txt
  • %User Temp%\dd_dotnetfx35install.txt
  • %User Temp%\dd_dotNetFx40_Full_x86_x64_decompression_log.txt
  • %User Temp%\dd_MSXML6_MSI0686.txt
  • %User Temp%\dd_netfx20MSI7F16.txt
  • %User Temp%\dd_netfx20UI7F16.txt
  • %User Temp%\dd_NET_Framework20_Setup06A7.txt
  • %User Temp%\dd_NET_Framework30_Setup0775.txt
  • %User Temp%\dd_NET_Framework35_MSI07B9.txt
  • %User Temp%\dd_RGB9RAST_x86.msi0683.txt
  • %User Temp%\dd_vcredistMSI3CAA.txt
  • %User Temp%\dd_vcredistMSI7C21.txt
  • %User Temp%\dd_vcredistUI3CAA.txt
  • %System Root%\wntmpg\SYSTEM~1.EXE

(Note: %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.. %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming 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.. %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.. %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)

Dropping Routine

This Trojan drops the following files:

  • igfTrayWind.exe
  • tolstop.exe
  • tabbycat.bat
  • MontereyJack
  • randseed.bin
  • pubring.pgp
  • pgp.exe
  • systemTrayW.exe
  • chip_and_dale.vzhk
  • %User Temp%\chip_and_d.$00
  • %User Temp%\chip_and_d.$01
  • %User Temp%\chip_and_d.$02
  • chip_and_dale.asc
  • %User Profile%\Sample Pictures\Blue hills.jpg.Chip
  • %User Profile%\Sample Pictures\Blue hills.jpg.ChipDale
  • %User Profile%\Sample Pictures\Sunset.jpg.Chip
  • %User Profile%\Sample Pictures\Sunset.jpg.ChipDale
  • %User Profile%\Sample Pictures\Water lilies.jpg.Chip
  • %User Profile%\Sample Pictures\Water lilies.jpg.ChipDale
  • %User Profile%\Sample Pictures\Winter.jpg.Chip
  • %User Profile%\Sample Pictures\Winter.jpg.ChipDale
  • %User Profile%\Internet Explorer\brndlog.txt.Chip
  • %User Profile%\Internet Explorer\brndlog.txt.ChipDale
  • %Application Data%\Microsoft\Windows Media\9.0\WMSDKNS.XML.Chip
  • %Application Data%\Microsoft\Windows Media\9.0\WMSDKNS.XML.ChipDale
  • %User Profile%\Templates\excel.xls.Chip
  • %User Profile%\Templates\excel.xls.ChipDale
  • %User Profile%\Templates\excel4.xls.Chip
  • %User Profile%\Templates\excel4.xls.ChipDale
  • %User Profile%\Templates\powerpnt.ppt.Chip
  • %User Profile%\Templates\powerpnt.ppt.ChipDale
  • %User Profile%\Templates\winword.doc.Chip
  • %User Profile%\Templates\winword.doc.ChipDale
  • %User Profile%\Templates\winword2.doc.Chip
  • %User Profile%\Templates\winword2.doc.ChipDale
  • %User Temp%\dd_depcheck_NETFX_EXP_35.txt.Chip
  • %User Temp%\dd_depcheck_NETFX_EXP_35.txt.ChipDale
  • %User Temp%\dd_dotnetfx35error.txt.Chip
  • %User Temp%\dd_dotnetfx35error.txt.ChipDale
  • %User Temp%\dd_dotnetfx35install.txt.Chip
  • %User Temp%\dd_dotnetfx35install.txt.ChipDale
  • %User Temp%\dd_dotNetFx40_Full_x86_x64_decompression_log.txt.Chip
  • %User Temp%\dd_dotNetFx40_Full_x86_x64_decompression_log.txt.ChipDale
  • %User Temp%\dd_MSXML6_MSI0686.txt.Chip
  • %User Temp%\dd_MSXML6_MSI0686.txt.ChipDale
  • %User Temp%\dd_netfx20MSI7F16.txt.Chip
  • %User Temp%\dd_netfx20MSI7F16.txt.ChipDale
  • %User Temp%\dd_netfx20UI7F16.txt.Chip
  • %User Temp%\dd_netfx20UI7F16.txt.ChipDale
  • %User Temp%\dd_NET_Framework20_Setup06A7.txt.Chip
  • %User Temp%\dd_NET_Framework20_Setup06A7.txt.ChipDale
  • %User Temp%\dd_NET_Framework30_Setup0775.txt.Chip
  • %User Temp%\dd_NET_Framework30_Setup0775.txt.ChipDale
  • %User Temp%\dd_NET_Framework35_MSI07B9.txt.Chip
  • %User Temp%\dd_NET_Framework35_MSI07B9.txt.ChipDale
  • %User Temp%\dd_RGB9RAST_x86.msi0683.txt.Chip
  • %User Temp%\dd_RGB9RAST_x86.msi0683.txt.ChipDale
  • %User Temp%\dd_vcredistMSI3CAA.txt.Chip
  • %User Temp%\dd_vcredistMSI3CAA.txt.ChipDale
  • %User Temp%\dd_vcredistMSI7C21.txt.Chip
  • %User Temp%\dd_vcredistMSI7C21.txt.ChipDale
  • %User Temp%\dd_vcredistUI3CAA.txt.Chip
  • %User Temp%\dd_vcredistUI3CAA.txt.ChipDale
  • %User Temp%\dd_vcredistUI7C21.txt.Chip
  • %User Profile%\Sample Pictures\!_Ñïàñòè ôàéëû_24LP.TXt
  • %User Profile%\Internet Explorer\!_Ñïàñòè ôàéëû_24LP.TXt
  • %Application Data%\Microsoft\Windows Media\9.0\!_Ñïàñòè ôàéëû_24LP.TXt
  • %User Profile%\Templates\!_Ñïàñòè ôàéëû_24LP.TXt
  • %User Temp%\!_Ñïàñòè ôàéëû_24LP.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.. %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.. %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming 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.)

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.700

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

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.
  • igfTrayWind.exe
  • tolstop.exe
  • tabbycat.bat
  • MontereyJack
  • randseed.bin
  • pubring.pgp
  • pgp.exe
  • systemTrayW.exe
  • chip_and_dale.vzhk
  • %User Temp%\chip_and_d.$00
  • %User Temp%\chip_and_d.$01
  • %User Temp%\chip_and_d.$02
  • chip_and_dale.asc
  • %User Profile%\Sample Pictures\Blue hills.jpg.Chip
  • %User Profile%\Sample Pictures\Blue hills.jpg.ChipDale
  • %User Profile%\Sample Pictures\Sunset.jpg.Chip
  • %User Profile%\Sample Pictures\Sunset.jpg.ChipDale
  • %User Profile%\Sample Pictures\Water lilies.jpg.Chip
  • %User Profile%\Sample Pictures\Water lilies.jpg.ChipDale
  • %User Profile%\Sample Pictures\Winter.jpg.Chip
  • %User Profile%\Sample Pictures\Winter.jpg.ChipDale
  • %User Profile%\Internet Explorer\brndlog.txt.Chip
  • %User Profile%\Internet Explorer\brndlog.txt.ChipDale
  • %Application Data%\Microsoft\Windows Media\9.0\WMSDKNS.XML.Chip
  • %Application Data%\Microsoft\Windows Media\9.0\WMSDKNS.XML.ChipDale
  • %User Profile%\Templates\excel.xls.Chip
  • %User Profile%\Templates\excel.xls.ChipDale
  • %User Profile%\Templates\excel4.xls.Chip
  • %User Profile%\Templates\excel4.xls.ChipDale
  • %User Profile%\Templates\powerpnt.ppt.Chip
  • %User Profile%\Templates\powerpnt.ppt.ChipDale
  • %User Profile%\Templates\winword.doc.Chip
  • %User Profile%\Templates\winword.doc.ChipDale
  • %User Profile%\Templates\winword2.doc.Chip
  • %User Profile%\Templates\winword2.doc.ChipDale
  • %User Temp%\dd_depcheck_NETFX_EXP_35.txt.Chip
  • %User Temp%\dd_depcheck_NETFX_EXP_35.txt.ChipDale
  • %User Temp%\dd_dotnetfx35error.txt.Chip
  • %User Temp%\dd_dotnetfx35error.txt.ChipDale
  • %User Temp%\dd_dotnetfx35install.txt.Chip
  • %User Temp%\dd_dotnetfx35install.txt.ChipDale
  • %User Temp%\dd_dotNetFx40_Full_x86_x64_decompression_log.txt.Chip
  • %User Temp%\dd_dotNetFx40_Full_x86_x64_decompression_log.txt.ChipDale
  • %User Temp%\dd_MSXML6_MSI0686.txt.Chip
  • %User Temp%\dd_MSXML6_MSI0686.txt.ChipDale
  • %User Temp%\dd_netfx20MSI7F16.txt.Chip
  • %User Temp%\dd_netfx20MSI7F16.txt.ChipDale
  • %User Temp%\dd_netfx20UI7F16.txt.Chip
  • %User Temp%\dd_netfx20UI7F16.txt.ChipDale
  • %User Temp%\dd_NET_Framework20_Setup06A7.txt.Chip
  • %User Temp%\dd_NET_Framework20_Setup06A7.txt.ChipDale
  • %User Temp%\dd_NET_Framework30_Setup0775.txt.Chip
  • %User Temp%\dd_NET_Framework30_Setup0775.txt.ChipDale
  • %User Temp%\dd_NET_Framework35_MSI07B9.txt.Chip
  • %User Temp%\dd_NET_Framework35_MSI07B9.txt.ChipDale
  • %User Temp%\dd_RGB9RAST_x86.msi0683.txt.Chip
  • %User Temp%\dd_RGB9RAST_x86.msi0683.txt.ChipDale
  • %User Temp%\dd_vcredistMSI3CAA.txt.Chip
  • %User Temp%\dd_vcredistMSI3CAA.txt.ChipDale
  • %User Temp%\dd_vcredistMSI7C21.txt.Chip
  • %User Temp%\dd_vcredistMSI7C21.txt.ChipDale
  • %User Temp%\dd_vcredistUI3CAA.txt.Chip
  • %User Temp%\dd_vcredistUI3CAA.txt.ChipDale
  • %User Temp%\dd_vcredistUI7C21.txt.Chip
  • %User Profile%\Sample Pictures\!_Ñïàñòè ôàéëû_24LP.TXt
  • %User Profile%\Internet Explorer\!_Ñïàñòè ôàéëû_24LP.TXt
  • %Application Data%\Microsoft\Windows Media\9.0\!_Ñïàñòè ôàéëû_24LP.TXt
  • %User Profile%\Templates\!_Ñïàñòè ôàéëû_24LP.TXt
  • %User Temp%\!_Ñïàñòè ôàéëû_24LP.TXt

Step 3

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.
  • %System Root%\wntmpg

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_CRILOCK.YNK. 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 5

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 Profile%\Sample Pictures\Blue hills.jpg
  • %User Profile%\Sample Pictures\Sunset.jpg
  • %User Profile%\Sample Pictures\Water lilies.jpg
  • %User Profile%\Sample Pictures\Winter.jpg
  • %User Profile%\Internet Explorer\brndlog.txt
  • %Application Data%\Microsoft\Windows Media\9.0\WMSDKNS.XML
  • %User Profile%\Templates\excel.xls
  • %User Profile%\Templates\excel4.xls
  • %User Profile%\Templates\powerpnt.ppt
  • %User Profile%\Templates\winword.doc
  • %User Profile%\Templates\winword2.doc
  • %User Temp%\dd_depcheck_NETFX_EXP_35.txt
  • %User Temp%\dd_dotnetfx35error.txt
  • %User Temp%\dd_dotnetfx35install.txt
  • %User Temp%\dd_dotNetFx40_Full_x86_x64_decompression_log.txt
  • %User Temp%\dd_MSXML6_MSI0686.txt
  • %User Temp%\dd_netfx20MSI7F16.txt
  • %User Temp%\dd_netfx20UI7F16.txt
  • %User Temp%\dd_NET_Framework20_Setup06A7.txt
  • %User Temp%\dd_NET_Framework30_Setup0775.txt
  • %User Temp%\dd_NET_Framework35_MSI07B9.txt
  • %User Temp%\dd_RGB9RAST_x86.msi0683.txt
  • %User Temp%\dd_vcredistMSI3CAA.txt
  • %User Temp%\dd_vcredistMSI7C21.txt
  • %User Temp%\dd_vcredistUI3CAA.txt
  • %System Root%\wntmpg\SYSTEM~1.EXE


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