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TROJ_DROPPER.MX

February 05, 2016
 ALIASES:

TrojanDropper:Win32/Joiner.AJ (Microsoft); BackDoor-CEO (McAfee); Downloader (Symantec); Trojan-Dropper.Win32.Pincher.hp (Kaspersky); BehavesLike.Win32.Malware.dss (mx-v) (Sunbelt); Trojan.Clicker.Delf.KG (FSecure)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 200

 OVERALL RISK RATING:
 REPORTED INFECTION:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild:

  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:

2,613,548 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

02 Oct 2011

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\ADMINI~1
  • %User Profile%\LOCALS~1
  • %User Temp%\nsr5.tmp
  • %System Root%\Fraps
  • %System Root%\Fraps\HELP
  • %System Root%\Documents and Settings
  • %System Root%\Documents and Settings\Administrator
  • %Start Menu%\Programs
  • %Start Menu%\Programs\Fraps

(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.)

Other System Modifications

This Trojan deletes the following files:

  • %User Temp%\ope1.tmp
  • %User Temp%\ope2.tmp
  • %User Temp%\nsm3.tmp
  • %User Temp%\nsr5.tmp
  • %User Temp%\beepa.bmp
  • %User Temp%\nsr5.tmp\AdvSplash.dll
  • %User Temp%\nsr5.tmp\StartMenu.dll
  • %User Temp%\nsr5.tmp\System.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.)

It deletes the following folders:

  • %User Temp%\nsr5.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\SYSTEM\CurrentControlSet\
Control\MediaResources\icm\
VIDC.FPS1

HKEY_LOCAL_MACHINE\SOFTWARE\Fraps

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
Fraps

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\drivers.desc
frapsvid.dll = "Fraps Video Decompressor"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Drivers32
VIDC.FPS1 = "frapsvid.dll"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Control\MediaResources\icm\
VIDC.FPS1
Description = "Fraps Video Decompressor"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Control\MediaResources\icm\
VIDC.FPS1
Driver = "frapsvid.dll"

HKEY_LOCAL_MACHINE\SOFTWARE\Fraps
Install_Dir = "%System Root%\Fraps"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Fraps
DisplayName = "Fraps"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Fraps
UninstallString = ""%System Root%\Fraps\uninstall.exe""

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Fraps
NsisSM = "Fraps"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Fraps
NsisInst = {random values}

Dropping Routine

This Trojan drops the following files:

  • %User Temp%\Frapsyatina.exe
  • %User Temp%\setup.exe
  • %User Temp%\nsc4.tmp
  • %User Temp%\beepa.bmp
  • %User Temp%\nsr5.tmp\AdvSplash.dll
  • %User Temp%\nsr5.tmp\StartMenu.dll
  • %System Root%\Fraps\fraps.exe
  • %System Root%\Fraps\fraps32.dll
  • %System Root%\Fraps\fraps64.dll
  • %System Root%\Fraps\frapslcd.dll
  • %System Root%\Fraps\fraps64.dat
  • %System Root%\Fraps\changes.txt
  • %System Root%\Fraps\README.HTM
  • %System Root%\Fraps\HELP\help_fps.htm
  • %System Root%\Fraps\HELP\help_general.htm
  • %System Root%\Fraps\HELP\help_movies.htm
  • %System Root%\Fraps\HELP\help_screenshots.htm
  • %System%\frapsvid.dll
  • %User Temp%\nsr5.tmp\System.dll
  • %Start Menu%\Programs\Fraps\Uninstall.lnk
  • %Start Menu%\Programs\Fraps\Fraps.lnk
  • %Desktop%\Fraps.lnk
  • %System Root%\Fraps\uninstall.exe

(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.. %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.. %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.. %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.. %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.)

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.200

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\SYSTEM\CurrentControlSet\Control\MediaResources\icm
    • VIDC.FPS1
  • In HKEY_LOCAL_MACHINE\SOFTWARE
    • Fraps
  • In HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Uninstall
    • Fraps

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\Microsoft\Windows NT\CurrentVersion\drivers.desc
    • frapsvid.dll="Fraps Video Decompressor"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Drivers32
    • VIDC.FPS1="frapsvid.dll"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\MediaResources\icm\VIDC.FPS1
    • Description="Fraps Video Decompressor"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\MediaResources\icm\VIDC.FPS1
    • Driver="frapsvid.dll"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Fraps
    • Install_Dir="%System Root%\Fraps"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Fraps
    • DisplayName="Fraps"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Fraps
    • UninstallString=""%System Root%\Fraps\uninstall.exe""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Fraps
    • NsisSM="Fraps"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Fraps
    • NsisInst={random values}

Step 4

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\ADMINI~1
  • %User Profile%\LOCALS~1
  • %User Temp%\nsr5.tmp
  • %System Root%\Fraps
  • %System Root%\Fraps\HELP
  • %System Root%\Documents and Settings
  • %System Root%\Documents and Settings\Administrator
  • %Start Menu%\Programs
  • %Start Menu%\Programs\Fraps

Step 5

Search and delete these files

[ Learn More ]
There may be some component files 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%\Frapsyatina.exe
  • %User Temp%\setup.exe
  • %User Temp%\nsc4.tmp
  • %User Temp%\beepa.bmp
  • %User Temp%\nsr5.tmp\AdvSplash.dll
  • %User Temp%\nsr5.tmp\StartMenu.dll
  • %System Root%\Fraps\fraps.exe
  • %System Root%\Fraps\fraps32.dll
  • %System Root%\Fraps\fraps64.dll
  • %System Root%\Fraps\frapslcd.dll
  • %System Root%\Fraps\fraps64.dat
  • %System Root%\Fraps\changes.txt
  • %System Root%\Fraps\README.HTM
  • %System Root%\Fraps\HELP\help_fps.htm
  • %System Root%\Fraps\HELP\help_general.htm
  • %System Root%\Fraps\HELP\help_movies.htm
  • %System Root%\Fraps\HELP\help_screenshots.htm
  • %System%\frapsvid.dll
  • %User Temp%\nsr5.tmp\System.dll
  • %Start Menu%\Programs\Fraps\Uninstall.lnk
  • %Start Menu%\Programs\Fraps\Fraps.lnk
  • %Desktop%\Fraps.lnk
  • %System Root%\Fraps\uninstall.exe

Step 6

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