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TSPY_LEMIR.MB

July 25, 2013
 ALIASES:

Worm:Win32/Fasong.G (Microsoft); W32/Fasong.worm (McAfee); Infostealer.Gampass (Symantec); Trojan-GameThief.Win32.Lmir.apu (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan.Pws.Lmir.APU (FSecure)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 OVERALL RISK RATING:
 REPORTED INFECTION:
 SYSTEM IMPACT RATING:
 INFORMATION EXPOSURE:

  • Threat Type: Spyware

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


This spyware 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:

164,995 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

17 Feb 2012

Arrival Details

This spyware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Other System Modifications

This spyware adds the following registry keys:

HKEY_CLASSES_ROOT\BFWorkFile1007PV

HKEY_CLASSES_ROOT\CLSID\{78E611A2-E484-4A0D-811E-C40100A3F452}

HKEY_CLASSES_ROOT\CLSID\{78E611A2-E484-4A0D-811E-C40100A3F452}\
InprocServer32

HKEY_CLASSES_ROOT\AAQB.ShellExecuteHook1007

HKEY_CLASSES_ROOT\AAQB.ShellExecuteHook1007\Clsid

HKEY_CLASSES_ROOT\CLSID\{78E611A2-E484-4A0D-811E-C40100A3F452}\
ProgID

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
BFWorkFile1007PV
EFile = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
ShellExecuteHooks
{78E611A2-E484-4A0D-811E-C40100A3F452} = "Maihook1007"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{78E611A2-E484-4A0D-811E-C40100A3F452}\InprocServer32
ThreadingModel = "Apartment"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
BFWorkFile1007PV
DFile = "{random characters}"

It deletes the following registry keys:

HKEY_CURRENT_USER\Software\Aside Soft\
AsdeGame\User\Bf

HKEY_CURRENT_USER\Software\Aside Soft\
AsdeGame\Account Table

Dropping Routine

This spyware drops the following files:

  • %Program Files%\svchost.exe
  • %System Root%\filedebug
  • %Program Files%\AAQB.dll

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

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_CLASSES_ROOT
    • BFWorkFile1007PV
  • In HKEY_CLASSES_ROOT\CLSID
    • {78E611A2-E484-4A0D-811E-C40100A3F452}
  • In HKEY_CLASSES_ROOT\CLSID\{78E611A2-E484-4A0D-811E-C40100A3F452}
    • InprocServer32
  • In HKEY_CLASSES_ROOT
    • AAQB.ShellExecuteHook1007
  • In HKEY_CLASSES_ROOT\AAQB.ShellExecuteHook1007
    • Clsid
  • In HKEY_CLASSES_ROOT\CLSID\{78E611A2-E484-4A0D-811E-C40100A3F452}
    • ProgID

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\Classes\BFWorkFile1007PV
    • EFile = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\ShellExecuteHooks
    • {78E611A2-E484-4A0D-811E-C40100A3F452} = "Maihook1007"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{78E611A2-E484-4A0D-811E-C40100A3F452}\InprocServer32
    • ThreadingModel = "Apartment"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\BFWorkFile1007PV
    • DFile = "{random characters}"

Step 4

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.
  • %Program Files%\svchost.exe
  • %System Root%\filedebug
  • %Program Files%\AAQB.dll

Step 5

Scan your computer with your Trend Micro product to delete files detected as TSPY_LEMIR.MB. 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 6

Restore these deleted registry keys/values from backup

*Note: Only Microsoft-related keys/values will be restored. If the malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.

  • In HKEY_CURRENT_USER\Software\Aside Soft\AsdeGame\User
    • Bf
  • In HKEY_CURRENT_USER\Software\Aside Soft\AsdeGame
    • Account Table


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