TROJ_INJECT.SMD

October 08, 2012
 Analysis by: Michael Cabel
 ALIASES:

Trojan-Downloader.Win32.Pher.hok (Kaspersky)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

It connects to websites to download and execute a malicious file detected as TROJ_LETHIC.SMC. It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

This Trojan may be downloaded by other malware/grayware from remote sites.

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

  TECHNICAL DETAILS

File Size:

Varies

File Type:

PE

Memory Resident:

Yes

Initial Samples Received Date:

18 Feb 2011

Payload:

Downloads files

Arrival Details

This Trojan may be downloaded by the following malware/grayware from remote sites:

  • TROJ_SASFIS.HQ

It may be downloaded from the following remote sites:

  • http://{BLOCKED}.{BLOCKED}.175.219:59171/lnubvcre

Installation

This Trojan is injected into the following processes running in memory:

  • Explorer.exe

Autostart Technique

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
Taskman = "{malware path and file name}"

Download Routine

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

  • http://{BLOCKED}.{BLOCKED}.59.112:28100/gdfscd1
  • http://{BLOCKED}.{BLOCKED}.59.112:28100/nbgfvsd
  • http://{BLOCKED}.{BLOCKED}.4.96:17847/nrgrewe
  • http://{BLOCKED}.{BLOCKED}.4.96:17847/vrfewwe

It saves the files it downloads using the following names:

  • %User Temp%\{3 random numbers}.exe

(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.)

Trend Micro detects the dowloaded file as:

  • TROJ_LETHIC.SMC

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:

8.900

FIRST VSAPI PATTERN FILE:

7.844.09

FIRST VSAPI PATTERN DATE:

18 Feb 2011

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

Remove malware files dropped/downloaded by TROJ_INJECT.SMD

    TROJ_LETHIC.SMC
    TROJ_SASFIS.HQ

Step 3

Identify and delete files detected as TROJ_INJECT.SMD using the Recovery Console

[ 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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
    • Taskman = {malware path and file name}

Step 5

Scan your computer with your Trend Micro product to delete files detected as TROJ_INJECT.SMD. 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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