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BKDR_KULUOZ.QD

January 15, 2014
 Analysis by: Ardin Christopher Maglalang
 ALIASES:

Luhe.Fiha.A(AVG), Trojan.Win32.Meredrop(Ikarus), Win32/Kryptik.BSQQ(Nod32)

 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: 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 connects to a website to send and receive information.

  TECHNICAL DETAILS

File Size:

126,976 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

14 Jan 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.

Installation

This backdoor drops a copy of itself in the following folders using different file names:

  • %AppDataLocal%\{random filename}.exe

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

Autostart Technique

This backdoor creates the following registry entries to enable automatic execution of dropped component at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{Random Value} = "%AppDataLocal%\{Random Filename}.exe"

Other System Modifications

This backdoor adds the following registry keys:

HKEY_CURRENT_USER\Software\{Random Value}

It adds the following registry entries as part of its installation routine:

HKEY_CURRENT_USER\Software\{Random Value}
{Random} = "{Value}"

Backdoor Routine

This backdoor connects to the following websites to send and receive information:

  • http://{BLOCKED}.{BLOCKED}.248.25:8080/{VAlue}
  • http://{BLOCKED}.{BLOCKED}.232.99:8080/{VAlue}
  • http://{BLOCKED}.{BLOCKED}.42.186:8080/{VAlue}
  • http://{BLOCKED}.{BLOCKED}.213.112:8080/{VAlue}
  • http://{BLOCKED}.{BLOCKED}.124.232:8080/{VAlue}
  • http://{BLOCKED}.{BLOCKED}.55.22:443/{VAlue}
  • http://{BLOCKED}.{BLOCKED}.142.87:8080/{VAlue}
  • http://{BLOCKED}.{BLOCKED}.117.238:8080/{VAlue}
  • http://{BLOCKED}.{BLOCKED}.131.164:8080/{VAlue}
  • http://{BLOCKED}.{BLOCKED}.248.25:8080/{VAlue}
  • http://{BLOCKED}.{BLOCKED}.148.190:443/{VAlue}

  SOLUTION

Minimum Scan Engine:

9.700

FIRST VSAPI PATTERN FILE:

10.538.07

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

Scan your computer with your Trend Micro product and note files detected as BKDR_KULUOZ.QD

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

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
    • {Random Value}

Step 5

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
    • {Random Value} = "%AppDataLocal%\{Random Filename}.exe"

Step 6

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