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TROJ_RANSOM.XTT

August 06, 2014
 ALIASES:

Trojan:Win32/Sulunch!gmb (Microsoft); Trojan.Cryptolocker.E (Symantec); Trojan.Win32.Reconyc.byxj (Kaspersky); Troj/Ransom-AJT (Sophos); Trojan.Win32.Generic!BT (Sunbelt); Found Luhe.Fiha.A (AVG)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

 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:

1,098,609 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

06 Aug 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%\DOCUME~1
  • %System Root%\DOCUME~1\Wilbert
  • %User Profile%\LOCALS~1
  • %User Temp%\nst3.tmp
  • %User Temp%\sfxcreator_03705
  • %User Temp%\gnupg
  • gnupg

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %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 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.)

Other System Modifications

This Trojan deletes the following files:

  • %User Temp%\nsz1.tmp
  • %User Temp%\nst3.tmp
  • %User Temp%\gnupg\RANDOM~1
  • %User Profile%\User Account Pictures\guest.bmp
  • %User Profile%\User Account Pictures\Wilbert.bmp
  • %User Profile%\Default Pictures\airplane.bmp
  • %User Profile%\Default Pictures\ASTRON~1.BMP
  • %User Profile%\Default Pictures\ball.bmp
  • %User Profile%\Default Pictures\beach.bmp
  • %User Profile%\Default Pictures\BUTTER~1.BMP
  • %User Profile%\Default Pictures\car.bmp
  • %User Profile%\Default Pictures\cat.bmp
  • %User Profile%\Default Pictures\chess.bmp
  • %User Profile%\Default Pictures\DIRTBI~1.BMP
  • %User Profile%\Default Pictures\dog.bmp
  • %User Profile%\Default Pictures\drip.bmp
  • %User Profile%\Default Pictures\duck.bmp
  • %User Profile%\Default Pictures\fish.bmp
  • %User Profile%\Default Pictures\frog.bmp
  • %User Profile%\Default Pictures\guitar.bmp
  • %User Profile%\Default Pictures\horses.bmp
  • %User Profile%\Default Pictures\kick.bmp
  • %User Profile%\Default Pictures\lift-off.bmp
  • %User Profile%\Default Pictures\PALMTR~1.BMP
  • %User Profile%\Default Pictures\PINKFL~1.BMP
  • %User Profile%\Default Pictures\REDFLO~1.BMP
  • %User Profile%\Default Pictures\skater.bmp
  • %User Profile%\Default Pictures\SNOWFL~1.BMP
  • %User Profile%\Sample Pictures\BLUEHI~1.JPG
  • %User Profile%\Sample Pictures\Sunset.jpg
  • %User Profile%\Sample Pictures\WATERL~1.JPG
  • %User Profile%\Sample Pictures\Winter.jpg
  • %User Profile%\Internet Explorer\brndlog.txt
  • %User Profile%\Templates\winword.doc
  • %User Profile%\Templates\winword2.doc
  • %User Profile%\Templates\excel.xls
  • %User Profile%\Templates\excel4.xls
  • %User Profile%\Templates\powerpnt.ppt
  • %Application Data%\Microsoft\WALLPA~1.BMP
  • %User Temp%\DD_DEP~1.TXT
  • %User Temp%\DD_DOT~2.TXT
  • %User Temp%\DD_DOT~1.TXT
  • %User Temp%\DD_DOT~3.TXT

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

It deletes the following folders:

  • %User Profile%\Application Data\gnupg

(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.)

Dropping Routine

This Trojan drops the following files:

  • %User Temp%\nst3.tmp\System.dll
  • %User Temp%\gnupg\pubring.bak
  • %User Temp%\gnupg\pubring.gpg
  • %User Temp%\gnupg\random_seed
  • %User Temp%\gnupg\trustdb.gpg
  • %User Temp%\iconv.dll
  • %User Temp%\svchost.exe
  • %User Temp%\uncrypt.t
  • %User Temp%\nst3.tmp\ExecDos.dll
  • %System Root%/Documents and Settings/Wilbert/Application Data/gnupg\secring.gpg
  • %User Profile%\User Account Pictures\guest.bmp.gpg
  • %System Root%/Documents and Settings/Wilbert/Application Data/gnupg\random_seed
  • %User Profile%\User Account Pictures\Wilbert.bmp.gpg
  • %User Profile%\Default Pictures\airplane.bmp.gpg
  • %User Profile%\Default Pictures\astronaut.bmp.gpg
  • %User Profile%\Default Pictures\ball.bmp.gpg
  • %User Profile%\Default Pictures\beach.bmp.gpg
  • %User Profile%\Default Pictures\butterfly.bmp.gpg
  • %User Profile%\Default Pictures\car.bmp.gpg
  • %User Profile%\Default Pictures\cat.bmp.gpg
  • %User Profile%\Default Pictures\chess.bmp.gpg
  • %User Profile%\Default Pictures\dirt bike.bmp.gpg
  • %User Profile%\Default Pictures\dog.bmp.gpg
  • %User Profile%\Default Pictures\drip.bmp.gpg
  • %User Profile%\Default Pictures\duck.bmp.gpg
  • %User Profile%\Default Pictures\fish.bmp.gpg
  • %User Profile%\Default Pictures\frog.bmp.gpg
  • %User Profile%\Default Pictures\guitar.bmp.gpg
  • %User Profile%\Default Pictures\horses.bmp.gpg
  • %User Profile%\Default Pictures\kick.bmp.gpg
  • %User Profile%\Default Pictures\lift-off.bmp.gpg
  • %User Profile%\Default Pictures\palm tree.bmp.gpg
  • %User Profile%\Default Pictures\pink flower.bmp.gpg
  • %User Profile%\Default Pictures\red flower.bmp.gpg
  • %User Profile%\Default Pictures\skater.bmp.gpg
  • %User Profile%\Default Pictures\snowflake.bmp.gpg
  • %User Profile%\Sample Pictures\Blue hills.jpg.gpg
  • %User Profile%\Sample Pictures\Sunset.jpg.gpg
  • %User Profile%\Sample Pictures\Water lilies.jpg.gpg
  • %User Profile%\Sample Pictures\Winter.jpg.gpg
  • %User Profile%\Internet Explorer\brndlog.txt.gpg
  • %User Profile%\Templates\winword.doc.gpg
  • %User Profile%\Templates\winword2.doc.gpg
  • %User Profile%\Templates\excel.xls.gpg
  • %User Profile%\Templates\excel4.xls.gpg
  • %User Profile%\Templates\powerpnt.ppt.gpg
  • %Application Data%\Microsoft\Wallpaper1.bmp.gpg
  • %User Temp%\dd_depcheck_NETFX_EXP_35.txt.gpg
  • %User Temp%\dd_dotnetfx35error.txt.gpg
  • %User Temp%\dd_dotnetfx35install.txt.gpg
  • %User Temp%\dd_dotNetFx40_Full_x86_x64_decompression_log.txt.gpg
  • %User Profile%\gnupg\pubring.bak
  • %User Profile%\gnupg\pubring.gpg
  • %User Profile%\gnupg\random_seed
  • %User Profile%\gnupg\trustdb.gpg

(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.. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %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 current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)

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.
  • %User Temp%\nst3.tmp\System.dll
  • %User Temp%\gnupg\pubring.bak
  • %User Temp%\gnupg\pubring.gpg
  • %User Temp%\gnupg\random_seed
  • %User Temp%\gnupg\trustdb.gpg
  • %User Temp%\iconv.dll
  • %User Temp%\svchost.exe
  • %User Temp%\uncrypt.t
  • %User Temp%\nst3.tmp\ExecDos.dll
  • %System Root%/Documents and Settings/Wilbert/Application Data/gnupg\secring.gpg
  • %User Profile%\User Account Pictures\guest.bmp.gpg
  • %System Root%/Documents and Settings/Wilbert/Application Data/gnupg\random_seed
  • %User Profile%\User Account Pictures\Wilbert.bmp.gpg
  • %User Profile%\Default Pictures\airplane.bmp.gpg
  • %User Profile%\Default Pictures\astronaut.bmp.gpg
  • %User Profile%\Default Pictures\ball.bmp.gpg
  • %User Profile%\Default Pictures\beach.bmp.gpg
  • %User Profile%\Default Pictures\butterfly.bmp.gpg
  • %User Profile%\Default Pictures\car.bmp.gpg
  • %User Profile%\Default Pictures\cat.bmp.gpg
  • %User Profile%\Default Pictures\chess.bmp.gpg
  • %User Profile%\Default Pictures\dirt bike.bmp.gpg
  • %User Profile%\Default Pictures\dog.bmp.gpg
  • %User Profile%\Default Pictures\drip.bmp.gpg
  • %User Profile%\Default Pictures\duck.bmp.gpg
  • %User Profile%\Default Pictures\fish.bmp.gpg
  • %User Profile%\Default Pictures\frog.bmp.gpg
  • %User Profile%\Default Pictures\guitar.bmp.gpg
  • %User Profile%\Default Pictures\horses.bmp.gpg
  • %User Profile%\Default Pictures\kick.bmp.gpg
  • %User Profile%\Default Pictures\lift-off.bmp.gpg
  • %User Profile%\Default Pictures\palm tree.bmp.gpg
  • %User Profile%\Default Pictures\pink flower.bmp.gpg
  • %User Profile%\Default Pictures\red flower.bmp.gpg
  • %User Profile%\Default Pictures\skater.bmp.gpg
  • %User Profile%\Default Pictures\snowflake.bmp.gpg
  • %User Profile%\Sample Pictures\Blue hills.jpg.gpg
  • %User Profile%\Sample Pictures\Sunset.jpg.gpg
  • %User Profile%\Sample Pictures\Water lilies.jpg.gpg
  • %User Profile%\Sample Pictures\Winter.jpg.gpg
  • %User Profile%\Internet Explorer\brndlog.txt.gpg
  • %User Profile%\Templates\winword.doc.gpg
  • %User Profile%\Templates\winword2.doc.gpg
  • %User Profile%\Templates\excel.xls.gpg
  • %User Profile%\Templates\excel4.xls.gpg
  • %User Profile%\Templates\powerpnt.ppt.gpg
  • %Application Data%\Microsoft\Wallpaper1.bmp.gpg
  • %User Temp%\dd_depcheck_NETFX_EXP_35.txt.gpg
  • %User Temp%\dd_dotnetfx35error.txt.gpg
  • %User Temp%\dd_dotnetfx35install.txt.gpg
  • %User Temp%\dd_dotNetFx40_Full_x86_x64_decompression_log.txt.gpg
  • %User Profile%\gnupg\pubring.bak
  • %User Profile%\gnupg\pubring.gpg
  • %User Profile%\gnupg\random_seed
  • %User Profile%\gnupg\trustdb.gpg

Step 3

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%\nst3.tmp
  • %User Temp%\sfxcreator_03705
  • %User Temp%\gnupg
  • gnupg

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_RANSOM.XTT. 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 Temp%\nsz1.tmp
  • %User Temp%\nst3.tmp
  • %User Temp%\gnupg\RANDOM~1
  • %User Profile%\User Account Pictures\guest.bmp
  • %User Profile%\User Account Pictures\Wilbert.bmp
  • %User Profile%\Default Pictures\airplane.bmp
  • %User Profile%\Default Pictures\ASTRON~1.BMP
  • %User Profile%\Default Pictures\ball.bmp
  • %User Profile%\Default Pictures\beach.bmp
  • %User Profile%\Default Pictures\BUTTER~1.BMP
  • %User Profile%\Default Pictures\car.bmp
  • %User Profile%\Default Pictures\cat.bmp
  • %User Profile%\Default Pictures\chess.bmp
  • %User Profile%\Default Pictures\DIRTBI~1.BMP
  • %User Profile%\Default Pictures\dog.bmp
  • %User Profile%\Default Pictures\drip.bmp
  • %User Profile%\Default Pictures\duck.bmp
  • %User Profile%\Default Pictures\fish.bmp
  • %User Profile%\Default Pictures\frog.bmp
  • %User Profile%\Default Pictures\guitar.bmp
  • %User Profile%\Default Pictures\horses.bmp
  • %User Profile%\Default Pictures\kick.bmp
  • %User Profile%\Default Pictures\lift-off.bmp
  • %User Profile%\Default Pictures\PALMTR~1.BMP
  • %User Profile%\Default Pictures\PINKFL~1.BMP
  • %User Profile%\Default Pictures\REDFLO~1.BMP
  • %User Profile%\Default Pictures\skater.bmp
  • %User Profile%\Default Pictures\SNOWFL~1.BMP
  • %User Profile%\Sample Pictures\BLUEHI~1.JPG
  • %User Profile%\Sample Pictures\Sunset.jpg
  • %User Profile%\Sample Pictures\WATERL~1.JPG
  • %User Profile%\Sample Pictures\Winter.jpg
  • %User Profile%\Internet Explorer\brndlog.txt
  • %User Profile%\Templates\winword.doc
  • %User Profile%\Templates\winword2.doc
  • %User Profile%\Templates\excel.xls
  • %User Profile%\Templates\excel4.xls
  • %User Profile%\Templates\powerpnt.ppt
  • %Application Data%\Microsoft\WALLPA~1.BMP
  • %User Temp%\DD_DEP~1.TXT
  • %User Temp%\DD_DOT~2.TXT
  • %User Temp%\DD_DOT~1.TXT
  • %User Temp%\DD_DOT~3.TXT


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