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BKDR_BLBINDI.SMN

May 08, 2014
 ALIASES:

Backdoor:MSIL/Bladabindi.AJ (Microsoft); BackDoor-FBIB!7DC716D1A4C9 (McAfee); Trojan.MSIL.Disfa.bop (Kaspersky); Troj/DotNet-P (Sophos); Could be a Trojan horse PSW.ILUSpy (AVG)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


This backdoor 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:

24,064 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

29 Apr 2014

Arrival Details

This backdoor 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 backdoor adds the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control\MediaResources\msvideo

HKEY_CURRENT_USER\Software\b86d854200cf37ca087f5d6db3727b97

It adds the following registry entries:

HKEY_CURRENT_USER
di = "!"

HKEY_CURRENT_USER\Environment
SEE_MASK_NOZONECHECKS = "1"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
{malware path and file name} = "{malware path and file name}:*:enabled:{malware file name}"

It modifies the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Dfrg\BootOptimizeFunction
LcnStartLocation = "1463841"

(Note: The default value data of the said registry entry is 0.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Dfrg\BootOptimizeFunction
LcnEndLocation = "1665343"

(Note: The default value data of the said registry entry is 0.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Dfrg\BootOptimizeFunction
OptimizeError = "Insufficient free space"

(Note: The default value data of the said registry entry is Not Run.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Dfrg\BootOptimizeFunction
OptimizeComplete = "No"

(Note: The default value data of the said registry entry is No.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Dfrg\BootOptimizeFunction
LcnEndLocation = "1627306"

(Note: The default value data of the said registry entry is 0.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Dfrg\BootOptimizeFunction
OptimizeComplete = "Yes"

(Note: The default value data of the said registry entry is No.)

Other Details

This backdoor connects to the following possibly malicious URL:

  • {BLOCKED}.228.86

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.300

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
    • msvideo
  • In HKEY_CURRENT_USER\Software
    • b86d854200cf37ca087f5d6db3727b97

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_CURRENT_USER
    • di = "!"
  • In HKEY_CURRENT_USER\Environment
    • SEE_MASK_NOZONECHECKS = "1"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
    • {malware path and file name} = "{malware path and file name}:*:enabled:{malware file name}"

Step 4

Restore these modified registry values

[ Learn More ]

Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.

  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Dfrg\BootOptimizeFunction
    • From: LcnStartLocation = "1463841"
      To: LcnStartLocation = ""0""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Dfrg\BootOptimizeFunction
    • From: LcnEndLocation = "1665343"
      To: LcnEndLocation = ""0""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Dfrg\BootOptimizeFunction
    • From: OptimizeError = "Insufficient free space"
      To: OptimizeError = ""Not Run""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Dfrg\BootOptimizeFunction
    • From: OptimizeComplete = "No"
      To: OptimizeComplete = ""No""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Dfrg\BootOptimizeFunction
    • From: LcnEndLocation = "1627306"
      To: LcnEndLocation = ""0""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Dfrg\BootOptimizeFunction
    • From: OptimizeComplete = "Yes"
      To: OptimizeComplete = ""No""

Step 5

Scan your computer with your Trend Micro product to delete files detected as BKDR_BLBINDI.SMN. 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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