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BKDR_BLBINDI.NSS

June 06, 2014
 ALIASES:

Backdoor:MSIL/Bladabindi.AA, Backdoor:MSIL/Bladabindi.AA (Microsoft); Agent-FDH!EE64151A34D2 (McAfee); HEUR:Trojan.Win32.Generic (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan horse Dropper.Agent.BIOV (AVG)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

 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:

359,424 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

06 Jun 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.

Autostart Technique

This backdoor adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
5cd8f17f4086744065eb0992a09e05a2 = "%User Temp%\Trojan.exe .."

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
5cd8f17f4086744065eb0992a09e05a2 = "%User Temp%\Trojan.exe .."

Other System Modifications

This backdoor adds the following registry keys:

HKEY_CURRENT_USER\Software\5cd8f17f4086744065eb0992a09e05a2

It adds the following registry entries:

HKEY_CURRENT_USER\Software\5cd8f17f4086744065eb0992a09e05a2
US = "@"

HKEY_CURRENT_USER\Environment
SEE_MASK_NOZONECHECKS = "1"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%User Temp%\Trojan.exe = "%User Temp%\Trojan.exe:*:Enabled:Trojan.exe"

Dropping Routine

This backdoor drops the following files:

  • %User Profile%\Local Settings\Application DatasAiWRLMDAV.exe
  • %User Profile%\Local Settings\Application DataZXsomiovoV.Jpg
  • %System Root%\.tmp
  • %User Temp%\Trojan.exe
  • %User Startup%\5cd8f17f4086744065eb0992a09e05a2.exe

(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.. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %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, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.. %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup.)

Other Details

This backdoor connects to the following possibly malicious URL:

  • {BLOCKED}8.0.102

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.700

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
    • 5cd8f17f4086744065eb0992a09e05a2

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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • 5cd8f17f4086744065eb0992a09e05a2 = "%User Temp%\Trojan.exe .."
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • 5cd8f17f4086744065eb0992a09e05a2 = "%User Temp%\Trojan.exe .."
  • In HKEY_CURRENT_USER\Software\5cd8f17f4086744065eb0992a09e05a2
    • US = "@"
  • In HKEY_CURRENT_USER\Environment
    • SEE_MASK_NOZONECHECKS = "1"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
    • %User Temp%\Trojan.exe = "%User Temp%\Trojan.exe:*:Enabled:Trojan.exe"

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%\Local Settings\Application DatasAiWRLMDAV.exe
  • %User Profile%\Local Settings\Application DataZXsomiovoV.Jpg
  • %System Root%\.tmp
  • %User Temp%\Trojan.exe
  • %User Startup%\5cd8f17f4086744065eb0992a09e05a2.exe

Step 6

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