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TROJ_MSIL.WJUR

August 15, 2015
 ALIASES:

Trojan:Win32/Dacic.A!rfn (Microsoft); RDN/Generic BackDoor (McAfee); Trojan.Gen (Symantec); Trojan.Win32.Dapta.ao (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan horse Crypt4.BPDL (AVG)

 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.

It deletes itself after execution.

  TECHNICAL DETAILS

File Size:

512,512 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

15 Aug 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 drops the following copies of itself into the affected system:

  • %Start Menu%\Programs\Startupx\system.pif
  • %User Profile%\JOJO\DDHAMO.exe

(Note: %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.. %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.)

It creates the following folders:

  • %User Profile%\Application Data\JOJO

(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.)

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
jojo = "%User Profile%\JOJO\DDHAMO.exe"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
hadjer = "%User Profile%\JOJO\DDHAMO.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{445BRPJ2-BAGU-O6AM-2OG4-UI1JH2N53B1E}
StubPath = "%User Profile%\JOJO\DDHAMO.exe restart"

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CURRENT_USER\SOFTWARE\5XbaU

HKEY_LOCAL_MACHINE\Software\Microsoft\
Active Setup\Installed Components\{445BRPJ2-BAGU-O6AM-2OG4-UI1JH2N53B1E}

HKEY_CURRENT_USER\SOFTWARE\2904

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control\MediaResources\msvideo

HKEY_CURRENT_USER\SOFTWARE\3224

HKEY_CURRENT_USER\SOFTWARE\3352

It adds the following registry entries:

HKEY_CURRENT_USER\Software\5XbaU
ServerStarted = "7/27/2015 10:43:48 AM"

HKEY_CURRENT_USER\Software\5XbaU
InstalledServer = "%User Profile%\JOJO\DDHAMO.exe"

HKEY_CURRENT_USER\Software\5XbaU
ServerStarted = "7/27/2015 10:44:35 AM"

HKEY_CURRENT_USER\Software\2904
Mutex = "5XbaU"

HKEY_CURRENT_USER\Software\5XbaU
NewGroup = "jojo"

HKEY_CURRENT_USER\Software\5XbaU
NewId = "jojo"

HKEY_CURRENT_USER\Software\5XbaU
FirstExecution = "27/07/2015 10:45:47"

HKEY_CURRENT_USER\Software\5XbaU
ServerStarted = "7/27/2015 10:44:55 AM"

HKEY_CURRENT_USER\Software\3224
Mutex = "5XbaU"

HKEY_CURRENT_USER\Software\5XbaU
ServerStarted = "7/27/2015 10:45:00 AM"

HKEY_CURRENT_USER\Software\3352
Mutex = "5XbaU"

Dropping Routine

This Trojan drops the following files:

  • %User Profile%\Windows\5XbaU.cfg
  • %User Temp%\x.html
  • %User Profile%\Windows\5XbaU.xtr
  • %User Profile%\JOJO\DDHAMO.exe
  • %Start Menu%\Programs\Startupx\system.pif

(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.. %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 Details

This Trojan connects to the following possibly malicious URL:

  • http://golinosssum1214.{BLOCKED}s.net:12001/1234567890.functions
  • http://{BLOCKED}.89.123:41004/1234567890.functions
  • {BLOCKED}0.1
  • {BLOCKED}.147.180

It deletes itself after execution.

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

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_CURRENT_USER\SOFTWARE
    • 5XbaU
  • In HKEY_LOCAL_MACHINE\Software\Microsoft\Active Setup\Installed Components
    • {445BRPJ2-BAGU-O6AM-2OG4-UI1JH2N53B1E}
  • In HKEY_CURRENT_USER\SOFTWARE
    • 2904
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\MediaResources
    • msvideo
  • In HKEY_CURRENT_USER\SOFTWARE
    • 3224
  • In HKEY_CURRENT_USER\SOFTWARE
    • 3352

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
    • jojo = "%User Profile%\JOJO\DDHAMO.exe"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • hadjer = "%User Profile%\JOJO\DDHAMO.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\{445BRPJ2-BAGU-O6AM-2OG4-UI1JH2N53B1E}
    • StubPath = "%User Profile%\JOJO\DDHAMO.exe restart"
  • In HKEY_CURRENT_USER\Software\5XbaU
    • ServerStarted = "7/27/2015 10:43:48 AM"
  • In HKEY_CURRENT_USER\Software\5XbaU
    • InstalledServer = "%User Profile%\JOJO\DDHAMO.exe"
  • In HKEY_CURRENT_USER\Software\5XbaU
    • ServerStarted = "7/27/2015 10:44:35 AM"
  • In HKEY_CURRENT_USER\Software\2904
    • Mutex = "5XbaU"
  • In HKEY_CURRENT_USER\Software\5XbaU
    • NewGroup = "jojo"
  • In HKEY_CURRENT_USER\Software\5XbaU
    • NewId = "jojo"
  • In HKEY_CURRENT_USER\Software\5XbaU
    • FirstExecution = "27/07/2015 10:45:47"
  • In HKEY_CURRENT_USER\Software\5XbaU
    • ServerStarted = "7/27/2015 10:44:55 AM"
  • In HKEY_CURRENT_USER\Software\3224
    • Mutex = "5XbaU"
  • In HKEY_CURRENT_USER\Software\5XbaU
    • ServerStarted = "7/27/2015 10:45:00 AM"
  • In HKEY_CURRENT_USER\Software\3352
    • Mutex = "5XbaU"

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 Profile%\Windows\5XbaU.cfg
  • %User Temp%\x.html
  • %User Profile%\Windows\5XbaU.xtr
  • %User Profile%\JOJO\DDHAMO.exe
  • %Start Menu%\Programs\Startupx\system.pif

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.
  • %User Profile%\Application Data\JOJO

Step 7

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