Analysis by: Mark Joseph Manahan
 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (64-bit), Windows Vista (64-bit), Windows 7 (64-bit)

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: Dropped by other malware

This Trojan may be dropped by other malware.

  TECHNICAL DETAILS

File Size: 229,376 bytes
File Type: DLL
Initial Samples Received Date: 14 Feb 2013
Payload: Connects to URLs/IPs

Arrival Details

This Trojan may be dropped by the following malware:

  • TROJ_PIDIEF.KGM

Installation

This Trojan creates the following folders:

  • {Malware Path}\{random}
  • %User Temp%\Low

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

It adds the following mutexes to ensure that only one of its copies runs at any one time:

  • JKDFHIUEJDH
  • HDIWJDGHWJK

Download Routine

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

  • http://{BLOCKED}loner.es/index.php

It saves the files it downloads using the following names:

  • %User Temp%\Low\cr{random}.tmp - renamed to {Malware Path}\lbarhelp64.dll
  • %User Temp%\Low\ia{random}.tmp - renamed to {Malware Path}\lbarext64.dll

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

  SOLUTION

Minimum Scan Engine: 9.300
FIRST VSAPI PATTERN FILE: 9.726.09
FIRST VSAPI PATTERN DATE: 15 Feb 2013
VSAPI OPR PATTERN File: 9.727.00
VSAPI OPR PATTERN Date: 15 Feb 2013

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

Remove the malware/grayware file that dropped/downloaded TROJ64_INJECT.CPX

Step 3

Scan your computer with your Trend Micro product and note files detected as TROJ64_INJECT.CPX

Step 4

Search and delete these folders

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %User Temp%\Low
  • %{Malware Path}\{random}

Step 5

Search and delete these files

[ Learn More ]
There may be some component 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.
  • {Malware Path}\lbarhelp64.dll
  • {Malware Path}\lbarext64.dll

Step 6

Scan your computer with your Trend Micro product to delete files detected as TROJ64_INJECT.CPX. 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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