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Threat Encyclopedia

TROJ_INJECT.LMV

ANALYSIS BY

Adrianne Chester Camat


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:

  • Threat Type:Trojan

  • Destructiveness:No

  • Encrypted: No

  • In the wild: Yes

OVERVIEW

Infection Channel:

Dropped by other malware, Downloaded from the Internet


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.

It executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

It creates an event. However, as of this writing, the said sites are inaccessible.

TECHNICAL DETAILS

File Size:

110,080 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

12 Apr 2013

Payload:

Connects to URLs/IPs

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.

Installation

This Trojan drops the following copies of itself into the affected system and executes them:

  • %AppDataLocal%\{random characters}\juschedg.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.)

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

  • 2D5EAY5F-2FCA-4438-AD91-FFKJ3E3EBR_[Normal Process Name]
  • 5f38d0f9-564

It injects threads into the following normal process(es):

  • iexplore.exe
  • firefox.exe

Autostart Technique

This Trojan adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{Random GUID} = "%AppDataLocal%\{random characters}\juschedg.exe"

Download Routine

This Trojan connects to the following URL(s) to download its component file(s):

  • http://{BLOCKED}89.org/wp/333/1.gif

It saves the files it downloads using the following names:

  • %AppDataLocal%\Apps\conhostd.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.)

It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://xtrb3h5gyswyzdc5.{BLOCKED}n/ct4.php
  • http://anhmgho2efkywudt.{BLOCKED}n/ct4.php

It creates the following event(s):

  • 2D5EAY5F-2FCA-4438-AD91-FFKJ3E3EBR-9546
  • misdf9009s3ksosk

However, as of this writing, the said sites are inaccessible.

It executes the downloaded file using the following commands:

  • --SocksPort 52300
  • --FascistFirewall

NOTES:

The command used to run the downloaded files are TOR client command parameters.

This means, that the downloaded files used the TOR network and may have connected to a TOR server to send/receive info or commands.

SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

9.864.05

FIRST VSAPI PATTERN DATE:

12 Apr 2013

VSAPI OPR PATTERN File:

9.865.00

VSAPI OPR PATTERN Date:

13 Apr 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

Restart in Safe Mode

[ Learn More ]

Step 3

Search and delete these files

[ 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.
 
  • %AppDataLocal%\{random characters}\juschedg.exe
  • %AppDataLocal%\Apps\conhostd.exe

Step 4

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 GUID} = "%AppDataLocal%\{random characters}\juschedg.exe"

Step 5

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