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BKDR_POISON.TUEZ

October 08, 2014
 Analysis by: RonJay Kristoffer Caragay
 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware

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:

512,000 bytes

File Type:

DLL

Memory Resident:

No

Initial Samples Received Date:

01 Oct 2014

Payload:

Connects to URLs/IPs, Drops files

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 drops the following shortcut pointing to its copy in the User Startup folder to enable its automatic execution at every system startup:

  • %User Startup%\SecurityCenter Application.lnk

(Note: %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup.)

Dropping Routine

This Trojan drops the following files:

  • %User Temp\Ushata.exe
  • %User Temp\Ushata.fox
  • %User Temp\Ushata.dll

Other Details

This Trojan connects to the following possibly malicious URL:

  • www.{BLOCKED}forest.jp/event/index.php

  SOLUTION

Minimum Scan Engine:

9.700

FIRST VSAPI PATTERN FILE:

11.186.05

FIRST VSAPI PATTERN DATE:

02 Oct 2014

VSAPI OPR PATTERN File:

11.187.00

VSAPI OPR PATTERN Date:

02 Oct 2014

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

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Search and delete this file

[ Learn More ]
There may be some files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • %User Temp\Ushata.exe
  • %User Temp\Ushata.fox
  • %User Temp\Ushata.dll
  • %User Startup%\SecurityCenter Application.lnk

Step 5

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