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TROJ_LYJADE.A

October 09, 2012
 Analysis by: Sabrina Lei Sioting
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • 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.

  TECHNICAL DETAILS

File Size:

489,472 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

17 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.

Autostart Technique

This Trojan registers itself as a BHO to ensure its automatic execution every time Internet Explorer is used by adding the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Helper Objects\{11111111-1111-1111-1111-110011491171}

Other System Modifications

This Trojan adds the following registry keys as part of its installation routine:

HKEY_CLASSES_ROOT\CrossriderApp0004971.BHO

HKEY_CLASSES_ROOT\CrossriderApp0004971.BHO.1

HKEY_CLASSES_ROOT\CrossriderApp0004971.FBApi

HKEY_CLASSES_ROOT\CrossriderApp0004971.FBApi.1

HKEY_CLASSES_ROOT\CrossriderApp0004971.Sandbox

HKEY_CLASSES_ROOT\CrossriderApp0004971.Sandbox.1

HKEY_CLASSES_ROOT\CLSID\{11111111-1111-1111-1111-110011491171}

HKEY_CLASSES_ROOT\CLSID\{22222222-2222-2222-2222-220022492271}

HKEY_CLASSES_ROOT\CLSID\{33333333-3333-3333-3333-330033493371}

HKEY_CLASSES_ROOT\Interface\{55555555-5555-5555-5555-550055495571}

HKEY_CLASSES_ROOT\Interface\{66666666-6666-6666-6666-660066496671}

HKEY_CLASSES_ROOT\Interface\{77777777-7777-7777-7777-770077497771}

HKEY_CLASSES_ROOT\TypeLib\{44444444-4444-4444-4444-440044494471}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CrossriderApp0004971.BHO

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CrossriderApp0004971.BHO.1

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CrossriderApp0004971.FBApi

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CrossriderApp0004971.FBApi.1

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CrossriderApp0004971.Sandbox

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CrossriderApp0004971.Sandbox.1

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{11111111-1111-1111-1111-110011491171}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{22222222-2222-2222-2222-220022492271}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{33333333-3333-3333-3333-330033493371}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{55555555-5555-5555-5555-550055495571}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{66666666-6666-6666-6666-660066496671}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{77777777-7777-7777-7777-770077497771}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{44444444-4444-4444-4444-440044494471}

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://stats.{BLOCKED}ider.com/installer.gif?{random characters}

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

9.118.04

FIRST VSAPI PATTERN DATE:

18 May 2012

VSAPI OPR PATTERN File:

9.119.00

VSAPI OPR PATTERN Date:

18 May 2012

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

Close all opened browser windows

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_CLASSES_ROOT
    • CrossriderApp0004971.BHO
  • In HKEY_CLASSES_ROOT
    • CrossriderApp0004971.BHO.1
  • In HKEY_CLASSES_ROOT
    • CrossriderApp0004971.FBApi
  • In HKEY_CLASSES_ROOT
    • CrossriderApp0004971.FBApi.1
  • In HKEY_CLASSES_ROOT
    • CrossriderApp0004971.Sandbox
  • In HKEY_CLASSES_ROOT
    • CrossriderApp0004971.Sandbox.1
  • In HKEY_CLASSES_ROOT\CLSID
    • {11111111-1111-1111-1111-110011491171}
  • In HKEY_CLASSES_ROOT\CLSID
    • {22222222-2222-2222-2222-220022492271}
  • In HKEY_CLASSES_ROOT\CLSID
    • {33333333-3333-3333-3333-330033493371}
  • In HKEY_CLASSES_ROOT\Interface
    • {55555555-5555-5555-5555-550055495571}
  • In HKEY_CLASSES_ROOT\Interface
    • {66666666-6666-6666-6666-660066496671}
  • In HKEY_CLASSES_ROOT\Interface
    • {77777777-7777-7777-7777-770077497771}
  • In HKEY_CLASSES_ROOT\TypeLib
    • {44444444-4444-4444-4444-440044494471}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes
    • CrossriderApp0004971.BHO
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes
    • CrossriderApp0004971.BHO.1
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes
    • CrossriderApp0004971.FBApi
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes
    • CrossriderApp0004971.FBApi.1
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes
    • CrossriderApp0004971.Sandbox
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes
    • CrossriderApp0004971.Sandbox.1
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID
    • {11111111-1111-1111-1111-110011491171}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID
    • {22222222-2222-2222-2222-220022492271}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID
    • {33333333-3333-3333-3333-330033493371}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface
    • {55555555-5555-5555-5555-550055495571}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface
    • {66666666-6666-6666-6666-660066496671}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface
    • {77777777-7777-7777-7777-770077497771}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib
    • {44444444-4444-4444-4444-440044494471}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects
    • {11111111-1111-1111-1111-110011491171}

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_LYJADE.A. 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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