TROJ_INJECT.FDP

October 09, 2012
 Analysis by: Mark Joseph Manahan
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users. It 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:

106,496 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

05 Jul 2012

Arrival Details

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

It 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:

  • %User Profile%\Application Data\KB{random number}.exe

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

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
KB{random number} = "%User Profile%\Application Data\KB{random number}.exe"

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\{9 Random letters or numbers 1}

HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\{9 Random letters or numbers 2}

It adds the following registry entries as part of its installation routine:

HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\{9 Random letters or numbers 2}
@ = "{Hex Values}"

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}.{BLOCKED}.194.242/za/v_01_a/in/
  • http://{BLOCKED}.{BLOCKED}.179.185/za/v_01_a/in/
  • http://{BLOCKED}.{BLOCKED}.189.212/za/v_01_a/in/
  • http://{BLOCKED}.{BLOCKED}.134.23/za/v_01_a/in/
  • http://{BLOCKED}.{BLOCKED}.189.124/za/v_01_a/in/
  • http://{BLOCKED}.{BLOCKED}.5.140/za/v_01_a/in/
  • http://{BLOCKED}.{BLOCKED}.147.35/za/v_01_a/in/
  • http://{BLOCKED}.{BLOCKED}.250.173/za/v_01_a/in/
  • http://{BLOCKED}.{BLOCKED}.252.26/za/v_01_a/in/
  • http://{BLOCKED}.{BLOCKED}.147.52/za/v_01_a/in/
  • http://{BLOCKED}.{BLOCKED}.2.214/za/v_01_a/in/
  • http://{BLOCKED}.{BLOCKED}.164.18/za/v_01_a/in/
  • http://{BLOCKED}.{BLOCKED}.150.72/za/v_01_a/in/
  • http://{BLOCKED}.{BLOCKED}.61.59/za/v_01_a/in/
  • http://{BLOCKED}.{BLOCKED}.13.84/za/v_01_a/in/
  • http://{BLOCKED}.{BLOCKED}.23.100/za/v_01_a/in/

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

9.236.07

FIRST VSAPI PATTERN DATE:

05 Jul 2012

VSAPI OPR PATTERN File:

9.237.00

VSAPI OPR PATTERN Date:

06 Jul 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

Restart in Safe Mode

[ Learn More ]

Step 3

Delete this registry key

[ 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 NT
    • {9 Random letters or numbers 1}
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows NT
    • {9 Random letters or numbers 2}

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
    • KB{random number} = "%User Profile%\Application Data\KB{random number}.exe"

Step 5

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