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BKDR_MEDIANA.A

October 09, 2012
 Analysis by: Lord Alfred Remorin
 ALIASES:

Trojan-Proxy.Win32.Mediana.k (Kaspersky)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Dropped by other malware


This backdoor may be dropped by other malware.

It executes commands from a remote malicious user, effectively compromising the affected system. It connects to a website to send and receive information.

  TECHNICAL DETAILS

File Size:

57,334 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

25 Aug 2012

Payload:

Connects to URLs/IPs

Arrival Details

This backdoor may be dropped by the following malware:

Backdoor Routine

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

  • Executes process
  • Sets current directory
  • Uploads and downloads file
  • Sends list of files and drives

It connects to the following websites to send and receive information:

  • www.{BLOCKED}s.com

NOTES:

;This backdoor enumerates entries in the following registry key to replace a file with its own copy:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\CurrentVersion\Run

It avoids replacing an .EXE file with same file name in the %Windows%\system32\dllcache folder. It also avoids replacing file with strings:

  • 360
  • avast
  • avg
  • avp
  • ccApp
  • dr.web
  • egui
  • feedback
  • system
  • UfSeAgnt
  • updaterui
  • win

The original copy of replaced file is copied to the same folder using the file name {malware file name}..exe.

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

9.346.06

FIRST VSAPI PATTERN DATE:

25 Aug 2012

VSAPI OPR PATTERN File:

9.347.00

VSAPI OPR PATTERN Date:

25 Aug 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 the malware/grayware file that dropped/downloaded BKDR_MEDIANA.A

Step 3

Scan your computer with your Trend Micro product and note files detected as BKDR_MEDIANA.A

NOTES:

Note:After identifying the malware detected as BKDR_MEDIANA.A, check if the same folder has a file with the format {malware file name}..exe. Terminate and delete the malware detected.

Rename the original file {malware file name}..exe to{malware file name}.exe.


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