Analysis by: Abraham Latimer Camba
 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.

It requires its main component to successfully perform its intended routine.

  TECHNICAL DETAILS

File Size: 187,944 bytes
File Type: DLL
Memory Resident: Yes
Initial Samples Received Date: 13 Apr 2012

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_CLASSES_ROOT\CLSID\{60972418-8A4B-B5CC-3C3D-0587F39623FF}

HKEY_CLASSES_ROOT\CLSID\{60972418-8A4B-B5CC-3C3D-0587F39623FF}\
InprocServer32

HKEY_CLASSES_ROOT\Qjvuhsdv

HKEY_CLASSES_ROOT\Qjvuhsdv\CLSID

HKEY_CLASSES_ROOT\CLSID\{60972418-8A4B-B5CC-3C3D-0587F39623FF}\
ProgID

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Helper Objects\{60972418-8A4B-B5CC-3C3D-0587F39623FF}

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
ShellIconOverlayIdentifiers\Enhanced Storage

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\qearydom

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\qearydom\Parameters

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\SvcHost\
netsvcs

It adds the following registry entries:

HKEY_CLASSES_ROOT\CLSID\{60972418-8A4B-B5CC-3C3D-0587F39623FF}\
InprocServer32
@ = "{malware path and filename}"

HKEY_CLASSES_ROOT\CLSID\{60972418-8A4B-B5CC-3C3D-0587F39623FF}\
InprocServer32
ThreadingModel = "Apartment"

HKEY_CLASSES_ROOT\Qjvuhsdv\CLSID
@ = "{60972418-8A4B-B5CC-3C3D-0587F39623FF}"

HKEY_CLASSES_ROOT\CLSID\{60972418-8A4B-B5CC-3C3D-0587F39623FF}\
ProgID
@ = "Qjvuhsdv"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
ShellIconOverlayIdentifiers\Enhanced Storage
@ = "{60972418-8A4B-B5CC-3C3D-0587F39623FF}"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\qearydom
ImagePath = "%System%\svchost.exe -k netsvcs"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\qearydom
Description = "Support for Microsoft AC Adapter"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\qearydom
DisplayName = "Microsoft AC Adapter Support"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\qearydom
ErrorControl = "1"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\qearydom
ObjectName = "LocalSystem"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\qearydom
Start = "2"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\qearydom
Type = "20"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\qearydom\Parameters
ServiceDll = "{malware path and filename}"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\qearydom\Parameters
ServiceMain = "DllRegisterServer"

HKEY_CLASSES_ROOT\CLSID\{60972418-8A4B-B5CC-3C3D-0587F39623FF}
Version = "64"

Other Details

This backdoor requires its main component to successfully perform its intended routine.

  SOLUTION

Minimum Scan Engine: 9.200
FIRST VSAPI PATTERN FILE: 8.918.01
FIRST VSAPI PATTERN DATE: 17 Apr 2012
VSAPI OPR PATTERN File: 8.919.00
VSAPI OPR PATTERN Date: 18 Apr 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

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_CLASSES_ROOT\CLSID
    • {60972418-8A4B-B5CC-3C3D-0587F39623FF}
  • In HKEY_CLASSES_ROOT
    • Qjvuhsdv
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects
    • {60972418-8A4B-B5CC-3C3D-0587F39623FF}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\ShellIconOverlayIdentifiers
    • Enhanced Storage
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services
    • qearydom
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SvcHost
    • netsvcs

Step 4

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