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TROJ_LIPLER.SML2

October 12, 2012
 ALIASES:

TrojanDownloader:Win32/Wintrim.BX (Microsoft); Skintrim.gen.k (McAfee); Trojan.Skintrim!gen2 (Symantec); Trojan-Downloader.Win32.Lipler.axkd (Kaspersky); Trojan-Downloader.Win32.Wintrim.bx (v) (Sunbelt); Adware:W32/Wintrim.gen!P (FSecure)

 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.

  TECHNICAL DETAILS

File Size:

818,894 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

13 Apr 2012

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 creates the following folders:

  • %System Root%\DOCUME~1
  • %System Root%\DOCUME~1\ADMINI~1
  • %User Profile%\LOCALS~1
  • %User Temp%\nsm3.tmp

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %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.. %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.)

Other System Modifications

This Trojan deletes the following files:

  • %User Temp%\nsc1.tmp
  • %User Temp%\nsm3.tmp

(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.)

It adds the following registry keys:

HKEY_LOCAL_MACHINE\Software\Official-eMule

HKEY_CURRENT_USER\Software\Official-eMule

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Official-eMule
dl_lg = "EN"

HKEY_CURRENT_USER\Software\Official-eMule
dl_lg = "EN"

HKEY_LOCAL_MACHINE\SOFTWARE\Official-eMule
nums = "FGApbjFAAA-FEt4YM6AAA"

HKEY_CURRENT_USER\Software\Official-eMule
nums = "FGApbjFAAA-FEt4YM6AAA"

HKEY_LOCAL_MACHINE\SOFTWARE\Official-eMule
grpid = "1738"

HKEY_CURRENT_USER\Software\Official-eMule
grpid = "1738"

HKEY_LOCAL_MACHINE\SOFTWARE\Official-eMule
installdt = "20120410"

HKEY_CURRENT_USER\Software\Official-eMule
installdt = "20120410"

HKEY_CURRENT_USER\Software\Official-eMule
uai = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\Official-eMule
dl_browser = "IE"

HKEY_CURRENT_USER\Software\Official-eMule
dl_browser = "IE"

HKEY_LOCAL_MACHINE\SOFTWARE\Official-eMule
dl_hp_url = "http://www.{BLOCKED}lsucher.com/?t=Q1204101738&s=h"

HKEY_CURRENT_USER\Software\Official-eMule
dl_hp_url = "http://www.{BLOCKED}lsucher.com/?t=Q1204101738&s=h"

HKEY_LOCAL_MACHINE\SOFTWARE\Official-eMule
dl_se_name = "Schnell Sucher"

HKEY_CURRENT_USER\Software\Official-eMule
dl_se_name = "Schnell Sucher"

HKEY_LOCAL_MACHINE\SOFTWARE\Official-eMule
dl_se_url = "http://www.{BLOCKED}lsucher.com/result.php?t=Q1204101738&s=b&keywords={searchTerms}"

HKEY_CURRENT_USER\Software\Official-eMule
dl_se_url = "http://www.{BLOCKED}lsucher.com/result.php?t=Q1204101738&s=b&keywords={searchTerms}"

HKEY_LOCAL_MACHINE\SOFTWARE\Official-eMule
dl_se_icon = "http://www.{BLOCKED}lsucher.com/favicon.ico"

HKEY_CURRENT_USER\Software\Official-eMule
dl_se_icon = "http://www.{BLOCKED}lsucher.com/favicon.ico"

HKEY_LOCAL_MACHINE\SOFTWARE\Official-eMule
ss_res = "{random characters}"

HKEY_CURRENT_USER\Software\Official-eMule
ss_res = "{random characters}"

HKEY_CURRENT_USER\Software\Official-eMule
_status = "ok"

HKEY_LOCAL_MACHINE\SOFTWARE\Official-eMule
sp_id = "1"

It modifies the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DirectDraw\MostRecentApplication
Name = "iexplore.exe"

(Note: The default value data of the said registry entry is iexplore.exe.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DirectDraw\MostRecentApplication
ID = "4117b81"

(Note: The default value data of the said registry entry is 41107b81.)

Dropping Routine

This Trojan drops the following files:

  • %User Temp%\nsr2.tmp
  • %User Temp%\nsm3.tmp\modern-header.bmp
  • %User Temp%\nsm3.tmp\modern-wizard.bmp
  • %User Temp%\nsm3.tmp\nsDialogs.dll
  • %User Temp%\nsm3.tmp\System.dll
  • %User Temp%\nsm3.tmp\emule_header_ss.bmp
  • %User Temp%\nsm3.tmp\FavoritDE.rtf
  • %User Temp%\nsm3.tmp\FavoritEN.rtf
  • %User Temp%\nsm3.tmp\FavoritES.rtf
  • %User Temp%\nsm3.tmp\FavoritFR.rtf
  • %User Temp%\nsm3.tmp\FavoritIT.rtf
  • %User Temp%\nsm3.tmp\inetc.dll
  • %User Temp%\Official-eMule_setup_dat.dat

(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.)

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://download.{BLOCKED}t-network.com/binaries/download.php
  • http://www.{BLOCKED}al-emule.com/nilog.php?{random characters}
  • http://download.{BLOCKED}al-emule.com/Official-eMule_download.php?file=Official-eMule_setup_dat

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.200

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

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_LOCAL_MACHINE\Software
    • Official-eMule
  • In HKEY_CURRENT_USER\Software
    • Official-eMule

Step 3

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\Official-eMule
    • dl_lg = "EN"
  • In HKEY_CURRENT_USER\Software\Official-eMule
    • dl_lg = "EN"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Official-eMule
    • nums = "FGApbjFAAA-FEt4YM6AAA"
  • In HKEY_CURRENT_USER\Software\Official-eMule
    • nums = "FGApbjFAAA-FEt4YM6AAA"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Official-eMule
    • grpid = "1738"
  • In HKEY_CURRENT_USER\Software\Official-eMule
    • grpid = "1738"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Official-eMule
    • installdt = "20120410"
  • In HKEY_CURRENT_USER\Software\Official-eMule
    • installdt = "20120410"
  • In HKEY_CURRENT_USER\Software\Official-eMule
    • uai = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Official-eMule
    • dl_browser = "IE"
  • In HKEY_CURRENT_USER\Software\Official-eMule
    • dl_browser = "IE"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Official-eMule
    • dl_hp_url = "http://www.{BLOCKED}lsucher.com/?t=Q1204101738&s=h"
  • In HKEY_CURRENT_USER\Software\Official-eMule
    • dl_hp_url = "http://www.{BLOCKED}lsucher.com/?t=Q1204101738&s=h"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Official-eMule
    • dl_se_name = "Schnell Sucher"
  • In HKEY_CURRENT_USER\Software\Official-eMule
    • dl_se_name = "Schnell Sucher"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Official-eMule
    • dl_se_url = "http://www.{BLOCKED}lsucher.com/result.php?t=Q1204101738&s=b&keywords={searchTerms}"
  • In HKEY_CURRENT_USER\Software\Official-eMule
    • dl_se_url = "http://www.{BLOCKED}lsucher.com/result.php?t=Q1204101738&s=b&keywords={searchTerms}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Official-eMule
    • dl_se_icon = "http://www.{BLOCKED}lsucher.com/favicon.ico"
  • In HKEY_CURRENT_USER\Software\Official-eMule
    • dl_se_icon = "http://www.{BLOCKED}lsucher.com/favicon.ico"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Official-eMule
    • ss_res = "{random characters}"
  • In HKEY_CURRENT_USER\Software\Official-eMule
    • ss_res = "{random characters}"
  • In HKEY_CURRENT_USER\Software\Official-eMule
    • _status = "ok"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Official-eMule
    • sp_id = "1"

Step 4

Restore this modified 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\DirectDraw\MostRecentApplication
    • From: Name = "iexplore.exe"
      To: Name = ""iexplore.exe""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\DirectDraw\MostRecentApplication
    • From: ID = "4117b81"
      To: ID = ""41107b81""

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.
  • %User Temp%\nsr2.tmp
  • %User Temp%\nsm3.tmp\modern-header.bmp
  • %User Temp%\nsm3.tmp\modern-wizard.bmp
  • %User Temp%\nsm3.tmp\nsDialogs.dll
  • %User Temp%\nsm3.tmp\System.dll
  • %User Temp%\nsm3.tmp\emule_header_ss.bmp
  • %User Temp%\nsm3.tmp\FavoritDE.rtf
  • %User Temp%\nsm3.tmp\FavoritEN.rtf
  • %User Temp%\nsm3.tmp\FavoritES.rtf
  • %User Temp%\nsm3.tmp\FavoritFR.rtf
  • %User Temp%\nsm3.tmp\FavoritIT.rtf
  • %User Temp%\nsm3.tmp\inetc.dll
  • %User Temp%\Official-eMule_setup_dat.dat

Step 6

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.
  • %System Root%\DOCUME~1
  • %System Root%\DOCUME~1\ADMINI~1
  • %User Profile%\LOCALS~1
  • %User Temp%\nsm3.tmp

Step 7

Scan your computer with your Trend Micro product to delete files detected as TROJ_LIPLER.SML2. 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.

Step 8

Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.

  • %User Temp%\nsc1.tmp
  • %User Temp%\nsm3.tmp


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