TROJ_DELF.MML


 ALIASES:

Trojan:Win32/Ordpea.A, Trojan:Win32/Ordpea.A, Trojan:Win32/Ordpea.A, Trojan:Win32/Ordpea.A, Trojan:W (Microsoft); [000135f8.EXE]:Generic PWS.y, [0000d1f8.EXE]:Spy-Agent.ac (McAfee); Downloader (Symantec); Trojan-Spy.Win32.Delf.pj (Kaspersky); BehavesLike.Win32.Malware.tsc (mx-v) (Sunbelt); Trojan.Generic.677189 (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:

145,637 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

02 Oct 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 drops the following copies of itself into the affected system:

  • {malware path and file name}_
  • %System%\Install.exe

(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)

Autostart Technique

This Trojan modifies the following registry entries to ensure it automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
Userinit = "%System%\userinit.exe,Install.exe"

(Note: The default value data of the said registry entry is %Windows%\system32\userinit.exe,.)

Other System Modifications

This Trojan deletes the following files:

  • {malware path and file name}_
  • %System%\Install.exe_
  • %System Root%\C3DA~1.BAT

(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

It adds the following registry keys:

HKEY_CURRENT_USER\Software\WinRAR\
Setup\.ccc

It adds the following registry entries:

HKEY_CURRENT_USER\Software\WinRAR\
Setup\.ccc
type02 = ",$,$"

HKEY_CURRENT_USER\Software\WinRAR\
Setup\.ccc
type03 = "%&' &'& "

HKEY_CURRENT_USER\Software\WinRAR\
Setup\.ccc
type04 = "gqfbqfpxx:pxx"

HKEY_CURRENT_USER\Software\WinRAR\
Setup\.ccc
type06 = "]zg`uxx:qlq"

HKEY_CURRENT_USER\Software\WinRAR\
Setup\.ccc
type07 = "W.HC]ZP[CGHgmg`qy'&H]zg`uxx:qlq"

HKEY_CURRENT_USER\Software\WinRAR\
Setup\.ccc
type08 = "}zgqf`:pxx"

HKEY_CURRENT_USER\Software\WinRAR\
Setup\.ccc
type01 = "{apu{uwqf:''&&:{fs"

HKEY_CURRENT_USER\Software\WinRAR\
Setup\.ccc
type05 = "ÚÆÞÓĵ¦ß¨²"

HKEY_CURRENT_USER\Software\WinRAR\
Setup\.ccc
type22 = "$"

HKEY_CURRENT_USER\Software\WinRAR\
Setup\.ccc
type10 = "%"

Dropping Routine

This Trojan drops the following files:

  • %System Root%\ .bat
  • %System%\insert.dll
  • %System%\serverdll.dll
  • %System Root%\pagefile.leu
  • %System%\Install.exe_

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)

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

Identify and delete files detected as TROJ_DELF.MML using either the Startup Disk or Recovery Console

[ 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\WinRAR\Setup
    • .ccc

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\WinRAR\Setup\.ccc
    • type02 = ",$,$"
  • In HKEY_CURRENT_USER\Software\WinRAR\Setup\.ccc
    • type03 = "%&' &'& "
  • In HKEY_CURRENT_USER\Software\WinRAR\Setup\.ccc
    • type04 = "gqfbqfpxx:pxx"
  • In HKEY_CURRENT_USER\Software\WinRAR\Setup\.ccc
    • type06 = "]zg`uxx:qlq"
  • In HKEY_CURRENT_USER\Software\WinRAR\Setup\.ccc
    • type07 = "W.HC]ZP[CGHgmg`qy'&H]zg`uxx:qlq"
  • In HKEY_CURRENT_USER\Software\WinRAR\Setup\.ccc
    • type08 = "}zgqf`:pxx"
  • In HKEY_CURRENT_USER\Software\WinRAR\Setup\.ccc
    • type01 = "{apu{uwqf:''&&:{fs"
  • In HKEY_CURRENT_USER\Software\WinRAR\Setup\.ccc
    • type05 = "ÚÆÞÓĵ¦ß¨²"
  • In HKEY_CURRENT_USER\Software\WinRAR\Setup\.ccc
    • type22 = "$"
  • In HKEY_CURRENT_USER\Software\WinRAR\Setup\.ccc
    • type10 = "%"

Step 5

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\Windows NT\CurrentVersion\Winlogon
    • From: Userinit = "%System%\userinit.exe,Install.exe"
      To: Userinit = ""%Windows%\system32\userinit.exe,""

Step 6

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.
  • %System Root%\ .bat
  • %System%\insert.dll
  • %System%\serverdll.dll
  • %System Root%\pagefile.leu
  • %System%\Install.exe_

Step 7

Scan your computer with your Trend Micro product to delete files detected as TROJ_DELF.MML. 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.

  • {malware path and file name}_
  • %System%\Install.exe_
  • %System Root%\C3DA~1.BAT


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