BKDR_KULUOZ.FE

November 23, 2012
 Analysis by: Rika Joi Gregorio
 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

Infection Channel:

Downloaded from the Internet

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:

52,224 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

15 Oct 2012

Payload:

Downloads files, Connects to URLs/IPs

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 the following copies of itself into the affected system:

  • %Application Data%\{random}.exe

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003.)

Backdoor Routine

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

  • {BLOCKED}.{BLOCKED}.211.194:8080/{generated value}
  • {BLOCKED}.{BLOCKED}.103.54:8080/{generated value}
  • {BLOCKED}.{BLOCKED}.20.226:8080/{generated value}
  • {BLOCKED}.{BLOCKED}.156.180:8080/{generated value}
  • {BLOCKED}.{BLOCKED}.224.202:8080/{generated value}
  • {BLOCKED}.{BLOCKED}.218.180:8080/{generated value}
  • {BLOCKED}.{BLOCKED}.218.181:8080/{generated value}
  • {BLOCKED}.{BLOCKED}.112.99:8080/{generated value}
  • {BLOCKED}.{BLOCKED}.136.150:8080/{generated value}
  • {BLOCKED}.{BLOCKED}.31.53:8080/{generated value}

Download Routine

This backdoor connects to the following website(s) to download and execute a malicious file:

  • http://{BLOCKED}.{BLOCKED}.136.150:8080//get/43d982be5107d1b8de698e16759b9956.exe - detected as TROJ_FAKEAV.FE

  SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

9.544.03

FIRST VSAPI PATTERN DATE:

12 Oct 2012

VSAPI OPR PATTERN File:

9.545.00

VSAPI OPR PATTERN Date:

13 Oct 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

Remove malware files dropped/downloaded by BKDR_KULUOZ.FE

     
    • TROJ_FAKEAV.FE

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

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