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TROJ_INJECTOR.NT

July 14, 2013
 Modified by: Nice Yutuc
 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 on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It may be injected into processes running in memory.

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

  TECHNICAL DETAILS

File Size:

22,232 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

09 Oct 2008

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:

  • %User Profile%\9ktl6dajl0.exe

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

It may be injected into processes running in memory.

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
9ktl6dajl0 = "%User Profile%\9ktl6dajl0.exe"

Other System Modifications

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion
9ktl6dajl0 = "{random values}"

Download Routine

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

  • {BLOCKED}.{BLOCKED}.236.116:443
  • {BLOCKED}.{BLOCKED}.236.114:443
  • {BLOCKED}.{BLOCKED}.236.115:443
  • {BLOCKED}.{BLOCKED}.32.194:443
  • {BLOCKED}.{BLOCKED}.32.195:443
  • {BLOCKED}.{BLOCKED}.32.196:443
  • abc.{BLOCKED}rt.in:443
  • {BLOCKED}t.in:443
  • mail.{BLOCKED}n.com:443
  • {BLOCKED}n.com:443
  • mx.{BLOCKED}n.com:443
  • www.{BLOCKED}n.com:443

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

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

5.592.01

FIRST VSAPI PATTERN DATE:

10 Oct 2008

VSAPI OPR PATTERN File:

5.593.00

VSAPI OPR PATTERN Date:

11 Oct 2008

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

Scan your computer with your Trend Micro product and note files detected as TROJ_INJECTOR.NT

Step 3

Restart in Safe Mode

[ Learn More ]

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
    • 9ktl6dajl0 = "%User Profile%\9ktl6dajl0.exe"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion
    • 9ktl6dajl0 = "{random values}"

Step 5

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