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TROJ_DLOADER.LX

May 31, 2013
 ALIASES:

TrojanDownloader:Win32/Banload (Microsoft); Generic.dx!xaq (McAfee); Downloader (Symantec); Trojan-Downloader.Win32.Genome.bxae (Kaspersky); Trojan.Win32.Packer.EnigmaProtector1.1X-1.3X (ep) (Sunbelt); Trojan horse Downloader.Generic10.AZEJ (AVG)

 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:

747,520 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

31 May 2013

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:

  • %Application Data%\install_flash_player.exe

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

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CURRENT_USER\Software\Enigma Protector\
29AEB4A0365755F6-B862CAE984EA4D0E

HKEY_CURRENT_USER\Software\Enigma Protector\
29AEB4A0365755F6-B862CAE984EA4D0E\02F01F553A112DCE-00C9DB38C18D5FD1

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Enigma Protector\
29AEB4A0365755F6-B862CAE984EA4D0E\02F01F553A112DCE-00C9DB38C18D5FD1
8BD0F9B1 = "{random values}"

HKEY_CURRENT_USER\Software\Enigma Protector\
29AEB4A0365755F6-B862CAE984EA4D0E
Options = "{random values}"

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://melhormome2.{BLOCKED}otemporario.com/imgs/xtopo.gif
  • http://melhormome2.{BLOCKED}otemporario.com/imgs/xsaida.gif
  • http://melhormome2.{BLOCKED}otemporario.com/imgs/xword.gif

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.300

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

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\Enigma Protector
    • 29AEB4A0365755F6-B862CAE984EA4D0E
  • In HKEY_CURRENT_USER\Software\Enigma Protector\29AEB4A0365755F6-B862CAE984EA4D0E
    • 02F01F553A112DCE-00C9DB38C18D5FD1

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_CURRENT_USER\Software\Enigma Protector\29AEB4A0365755F6-B862CAE984EA4D0E\02F01F553A112DCE-00C9DB38C18D5FD1
    • 8BD0F9B1 = "{random values}"
  • In HKEY_CURRENT_USER\Software\Enigma Protector\29AEB4A0365755F6-B862CAE984EA4D0E
    • Options = "{random values}"

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_DLOADER.LX. 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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