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TROJ_DLOADR.MM

October 13, 2012
 ALIASES:

Trojan.Win32.Generic!BT (Sunbelt)

 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.

It deletes itself after execution.

  TECHNICAL DETAILS

File Size:

611,392 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

22 May 2012

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%\9033276A
  • %User Temp%\9033276A\$$$$$$$$.{D6277990-4C6A-11CF-8D87-00AA0060F5BF}
  • %User Temp%\9033276A\$$$$$$$$.{D6277990-4C6A-11CF-8D87-00AA0060F5BF}\ $$$1
  • %User Temp%\9033276A\$$$$$$$$.{D6277990-4C6A-11CF-8D87-00AA0060F5BF}\ $$$2
  • %User Temp%\9033276A\$$$$$$$$.{D6277990-4C6A-11CF-8D87-00AA0060F5BF}\ $$$2\com1.{21EC2020-3AEA-1069-A2DD-08002B30309D}
  • %User Temp%\9033276A\$$$$$$$$.{D6277990-4C6A-11CF-8D87-00AA0060F5BF}\ $$$3
  • %Program Files%\Lhij

(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.. %Program Files% is the default Program Files folder, usually C:\Program Files.)

Autostart Technique

This Trojan registers as a system service to ensure its automatic execution at every system startup by adding the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\RemoteAccess\RouterManagers\
Ipx

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\RemoteAccess\RoutingTableManager\
Instance 00000

Other System Modifications

This Trojan deletes the following files:

  • %System%\flyboy.dat
  • %Program Files%\Lhij\Qhijklmno.bmp
  • %System Root%\selang.ini

(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.. %Program Files% is the default Program Files folder, usually C:\Program Files.. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

It adds the following registry keys:

HKEY_LOCAL_MACHINE\Software\{FCADC8A0-FEB7-4185-9F52-C5141DE0312E}

HKEY_LOCAL_MACHINE\SOFTWARE\122187667

HKEY_LOCAL_MACHINE\SOFTWARE\122187667\
Parameters

HKEY_LOCAL_MACHINE\SOFTWARE\198820234

HKEY_LOCAL_MACHINE\SOFTWARE\299641448

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\RemoteAccess\RoutingTableManager\
Instance 00000\AddressFamily 00002

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\{FCADC8A0-FEB7-4185-9F52-C5141DE0312E}
{819652AD-7464-4460-BCA9-0B0CBB4D00D8} = "{random characters}"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\RemoteAccess\RouterManagers\
Ipx
DLLPath = "%System Root%\234200.dll"

HKEY_LOCAL_MACHINE\SOFTWARE\122187667\
Parameters
ServiceDll = "%Program Files%\Lhij\Qhijklmno.bmp"

HKEY_LOCAL_MACHINE\SOFTWARE\299641448
netsvcs = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Reliability
156 = "as"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\RemoteAccess\Parameters\
Ip
EnableNetbtBcastFwd = "1"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\NetBT\Parameters
EnableProxy = "2"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\NetBT\Parameters\
Interfaces\Tcpip_{E13A8633-E77B-49D7-830C-ED5632B6883F}
RASFlags = "1"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\RemoteAccess\RoutingTableManager\
Instance 00000\AddressFamily 00002
AddressSize = "4"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\RemoteAccess\RoutingTableManager\
Instance 00000\AddressFamily 00002
ViewsSupported = "3"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\RemoteAccess\RoutingTableManager\
Instance 00000\AddressFamily 00002
MaxChangeNotifyRegistrations = "1"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\RemoteAccess\RoutingTableManager\
Instance 00000\AddressFamily 00002
MaxOpaqueInfoPointers = "5"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\RemoteAccess\RoutingTableManager\
Instance 00000\AddressFamily 00002
MaxNextHopsInRoute = "3"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\RemoteAccess\RoutingTableManager\
Instance 00000\AddressFamily 00002
MaxHandlesReturnedInEnum = "19"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\NetBT\Parameters
EnableProxy = "0"

Dropping Routine

This Trojan drops the following files:

  • %User Temp%\9033276A\$$$$$$~1.{D6\$$$2~1\com1~1.{21\{819652AD-7464-4460-BCA9-0B0CBB4D00D8}
  • %System Root%\234200.dll
  • %System Root%\fuck360.jpg
  • %Program Files%\Lhij\Qhijklmno.bmp

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

Other Details

This Trojan deletes itself after execution.

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.200

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

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\SYSTEM\CurrentControlSet\Services\RemoteAccess\RouterManagers
    • Ipx
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\RemoteAccess\RoutingTableManager
    • Instance 00000
  • In HKEY_LOCAL_MACHINE\Software
    • {FCADC8A0-FEB7-4185-9F52-C5141DE0312E}
  • In HKEY_LOCAL_MACHINE\SOFTWARE
    • 122187667
  • In HKEY_LOCAL_MACHINE\SOFTWARE\122187667
    • Parameters
  • In HKEY_LOCAL_MACHINE\SOFTWARE
    • 198820234
  • In HKEY_LOCAL_MACHINE\SOFTWARE
    • 299641448
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\RemoteAccess\RoutingTableManager\Instance 00000
    • AddressFamily 00002

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\{FCADC8A0-FEB7-4185-9F52-C5141DE0312E}
    • {819652AD-7464-4460-BCA9-0B0CBB4D00D8} = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\RemoteAccess\RouterManagers\Ipx
    • DLLPath = "%System Root%\234200.dll"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\122187667\Parameters
    • ServiceDll = "%Program Files%\Lhij\Qhijklmno.bmp"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\299641448
    • netsvcs = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Reliability
    • 156 = "as"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\RemoteAccess\Parameters\Ip
    • EnableNetbtBcastFwd = "1"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\NetBT\Parameters
    • EnableProxy = "2"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\NetBT\Parameters\Interfaces\Tcpip_{E13A8633-E77B-49D7-830C-ED5632B6883F}
    • RASFlags = "1"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\RemoteAccess\RoutingTableManager\Instance 00000\AddressFamily 00002
    • AddressSize = "4"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\RemoteAccess\RoutingTableManager\Instance 00000\AddressFamily 00002
    • ViewsSupported = "3"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\RemoteAccess\RoutingTableManager\Instance 00000\AddressFamily 00002
    • MaxChangeNotifyRegistrations = "1"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\RemoteAccess\RoutingTableManager\Instance 00000\AddressFamily 00002
    • MaxOpaqueInfoPointers = "5"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\RemoteAccess\RoutingTableManager\Instance 00000\AddressFamily 00002
    • MaxNextHopsInRoute = "3"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\RemoteAccess\RoutingTableManager\Instance 00000\AddressFamily 00002
    • MaxHandlesReturnedInEnum = "19"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\NetBT\Parameters
    • EnableProxy = "0"

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%\9033276A\~1.{D6\$2~1\com1~1.{21\{819652AD-7464-4460-BCA9-0B0CBB4D00D8}
  • %System Root%\234200.dll
  • %System Root%\fuck360.jpg
  • %Program Files%\Lhij\Qhijklmno.bmp
~1.{D6\$2~1\com1~1.{21\{819652AD-7464-4460-BCA9-0B0CBB4D00D8}
  • %System Root%\234200.dll
  • %System Root%\fuck360.jpg
  • %Program Files%\Lhij\Qhijklmno.bmp
    •
    Note: To do a search for the following files, right-click Start then click Search... or Find..., depending on the version of Windows you are running. For each file to be deleted, type its file name in the Named input box. In the Look In drop-down list, select My Computer, then press Enter.
  • Once located, select the file then press SHIFT+DELETE to permanently delete the file.
  • Repeat the said steps for all files listed.

    • 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%\9033276A
    • %User Temp%\9033276A\.{D6277990-4C6A-11CF-8D87-00AA0060F5BF}
    • %User Temp%\9033276A\.{D6277990-4C6A-11CF-8D87-00AA0060F5BF}\ $1
    • %User Temp%\9033276A\.{D6277990-4C6A-11CF-8D87-00AA0060F5BF}\ $2
    • %User Temp%\9033276A\.{D6277990-4C6A-11CF-8D87-00AA0060F5BF}\ $2\com1.{21EC2020-3AEA-1069-A2DD-08002B30309D}
    • %User Temp%\9033276A\.{D6277990-4C6A-11CF-8D87-00AA0060F5BF}\ $3
    • %Program Files%\Lhij
    .{D6277990-4C6A-11CF-8D87-00AA0060F5BF}
  • %User Temp%\9033276A\.{D6277990-4C6A-11CF-8D87-00AA0060F5BF}\ $1
  • %User Temp%\9033276A\.{D6277990-4C6A-11CF-8D87-00AA0060F5BF}\ $2
  • %User Temp%\9033276A\.{D6277990-4C6A-11CF-8D87-00AA0060F5BF}\ $2\com1.{21EC2020-3AEA-1069-A2DD-08002B30309D}
  • %User Temp%\9033276A\.{D6277990-4C6A-11CF-8D87-00AA0060F5BF}\ $3
  • %Program Files%\Lhij
    •
  • In the Look In drop-down list, select My Computer, then press Enter.
  • Once located, select the folder then press SHIFT+DELETE to permanently delete the folder.
  • Repeat the said steps for all folders listed.

    • Step 7

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

    • %System%\flyboy.dat
    • %Program Files%\Lhij\Qhijklmno.bmp
    • %System Root%\selang.ini


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