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WORM_BLBINDI.DRE

March 19, 2014
 ALIASES:

Backdoor:MSIL/Bladabindi.AA(Microsoft),a variant of MSIL/Bladabindi.O trojan(NOD32),HEUR:Trojan.Win32.Generic(Kaspersky)

 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:
 INFORMATION EXPOSURE:

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Propagates via removable drives

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

It executes commands from a remote malicious user, effectively compromising the affected system.

It steals certain information from the system and/or the user. It logs a user's keystrokes to steal information.

It connects to certain websites to send and receive information.

  TECHNICAL DETAILS

File Size:

44,544 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

14 Feb 2014

Payload:

Steals information

Arrival Details

This worm 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 worm drops the following copies of itself into the affected system:

  • %Application Data%\winrar.exe
  • %User Startup%\f181b87b5e994ddc44f095ec70fd0f2c.exe

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming 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.)

It drops the following files:

  • %Application Data%\winrar.exe.tmp

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
f181b87b5e994ddc44f095ec70fd0f2c = ""%Application Data%\winrar.exe" .."

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
f181b87b5e994ddc44f095ec70fd0f2c = ""%Application Data%\winrar.exe" .."

Other System Modifications

This worm adds the following registry keys:

HKEY_CURRENT_USER\Software\f181b87b5e994ddc44f095ec70fd0f2c

It adds the following registry entries:

HKEY_CURRENT_USER\Software\f181b87b5e994ddc44f095ec70fd0f2c
US = "{random hex values}"

HKEY_CURRENT_USER\Environment
SEE_MASK_NOZONECHECKS = "1"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%Application Data%\winrar.exe = "%Application Data%\winrar.exe:*:Enabled:winrar.exe"

Propagation

This worm drops the following copy(ies) of itself in all removable drives:

  • {removable drive letter}:\f181b87b5e994ddc44f095ec70fd0f2c.exe - hidden attribute

Backdoor Routine

This worm executes the following commands from a remote malicious user:

  • Capture screenshots
  • Manipulate the registry
  • Execute remote shell
  • Update itself
  • Download file

Information Theft

This worm steals the following information:

  • OS Version
  • Processor Information
  • User Name
  • Computer Name
  • Application name and date of the stolen keystrokes

It logs a user's keystrokes to steal information.

Other Details

This worm connects to the following website to send and receive information:

  • under.{BLOCKED}ties.com:1177

  SOLUTION

Minimum Scan Engine:

9.700

FIRST VSAPI PATTERN FILE:

10.626.07

FIRST VSAPI PATTERN DATE:

25 Feb 2014

VSAPI OPR PATTERN File:

10.627.00

VSAPI OPR PATTERN Date:

25 Feb 2014

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
    • f181b87b5e994ddc44f095ec70fd0f2c

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
    • f181b87b5e994ddc44f095ec70fd0f2c = ""%Application Data%\winrar.exe" .."
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • f181b87b5e994ddc44f095ec70fd0f2c = ""%Application Data%\winrar.exe" .."
  • In HKEY_CURRENT_USER\Environment
    • SEE_MASK_NOZONECHECKS = "1"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
    • %Application Data%\winrar.exe = "%Application Data%\winrar.exe:*:Enabled:winrar.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%\Application Data\winrar.exe.tmp

Step 6

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