TROJ_DLOADER.DJD

Malware type: Trojan

Aliases: Packed.Win32.Tibs.hy (Kaspersky), WORM/Zhelatin.Gen (Avira), Trojan:Win32/Tibs.FJ (Microsoft)

In the wild: Yes

Destructive: No

Language: English

Platform: Windows 98, ME, NT, 2000, XP, Server 2003

Encrypted: Yes

Overall risk rating:

Reported infections:

Damage potential:

Medium

Distribution potential:

Low

Description: 

A Trojan horse program is a malware that is not capable of automatically spreading to other systems. Trojans are usually downloaded from the Internet and installed by unsuspecting users.

Trojans typically carry payloads or other malicious actions that can range from the mildly annoying to the irreparably destructive. They may also modify system settings to automatically start. Restoring affected systems may require procedures other than scanning with an antivirus program.

For additional information about this threat, see:

Description created: Feb. 13, 2008 1:31:57 AM GMT -0800


TECHNICAL DETAILS


File type: PE

Memory resident:  Yes

Size of malware: 17,408 Bytes

Initial samples received on: Jan 31, 2008

Details:

Installation

This Trojan drops the following copy of itself:

  • %System%\kernelwind64.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.)

It drops the following component:

  • %System%\dllgh8jkd1q8

Autostart Techniques

This Trojan creates the following registry entry to enable its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\
Run
System = "%System%\kernelwind64.exe"

Other System Modifications

This Trojan disables the Task Manager by creating the following registry entry:

HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\Currentversion\
Policies\System
DisableTaskMgr = "1"

Download Routine

This Trojan accesses the following Web sites to download files:

  • http://{BLOCKED}.255.{BLOCKED}.226/gdnOT3256.exe - detected as DIAL_RAS.JS
  • http://{BLOCKED}.255.{BLOCKED}.154/loaderbb.php?l=0409&adv=23 - detected as TROJ_TIBS.ADR
  • http://{BLOCKED}.255.{BLOCKED}.154/winhgn.exe - TROJ_AGENT.FZJ
  • http://{BLOCKED}hka.com/lkjasdlkj/ldfgjhtg.exe?hash=%20.6926386 -detected as TSPY_BZUB.CL
  • http://{BLOCKED}tats.net/pic/proxy.jpg - detected as TROJ_JPGEMBED.A
  • http://{BLOCKED}tats.net/pic/search.jpg - detected as TROJ_JPGEMBED.A
  • http://{BLOCKED}tats.net/pic/tibs.jpg - detected as TROJ_JPGEMBED.A
  • http://{BLOCKED}tats.net/pic/tool.jpg - detected as TROJ_JPGEMBED.A
  • http://{BLOCKED}tats.net/pic/winlogon.jpg - detected as TROJ_JPGEMBED.A
  • http://{BLOCKED}tats.net/pictures1/ztool1 - detected as TROJ_TIBS.ADP
  • http://{BLOCKED}tats.net/pictures1/ztool2 - detected as TROJ_TIBS.ADQh
  • http://{BLOCKED}tats.net/pictures1/ztool3 - detected as WORM_NUCRYPT.GEN
  • http://{BLOCKED}tats.net/pictures1/ztool4 - detected as WORM_NUCRYPT.GEN
  • http://{BLOCKED}tats.net/pictures5/zgame1 - detected as TROJ_DLOADER.CCT
  • http://{BLOCKED}tats.net/pictures5/zgame2 - detected as TROJ_DLOADER.FP
  • http://{BLOCKED}tats.net/pictures5/zgame3 - detected as TROJ_AGENT.AJRZ
  • http://{BLOCKED}tats.net/pictures5/zgame4 - detected as TROJ_TIBS.ADP
  • http://{BLOCKED}tats.net/pictures5/zgame5 - detected as TROJ_TIBS.ADR

Analysis By: Joselito Dela Cruz


SOLUTION


Minimum scan engine version needed: 8.300


Important note: The "Minimum scan engine" refers to the earliest Trend Micro scan engine version guaranteed to detect this threat. However, Trend Micro strongly recommends that you update to the latest version in order to get comprehensive protection. Download the latest scan engine here.

Solution:

Important Windows ME/XP Cleaning Instructions

Users running Windows ME and XP must disable System Restore to allow full scanning of infected computers.

Users running other Windows versions can proceed with the succeeding solution set(s).

Restarting in Safe Mode

This malware has characteristics that require the computer to be restarted in safe mode. Go to this page for instructions on how to restart your computer in safe mode.

Enabling The Task Manager

This malware disables the Task Manager. To restore the said system tool, perform the following instructions:

• On Windows 98 ME, NT, and 2000:
  1. Open Notepad. Click Start>Run, type Notepad, then press Enter.
  2. Copy and paste the following:
  3. Save this file as C:\RESTORE.REG.
  4. Click Start>Run, type C:\RESTORE.REG, then press Enter.
  5. Click Yes at the prompt of the message box.
• On Windows XP and Server 2003:
  1. Open the Run dialog box. Click Start>Run, type Notepad, then press Enter.
  2. Copy and paste the following:
  3. Save this file as C:\RESTORE.REG.
  4. Click Start>Run, type C:\RESTORE.REG, then press Enter.
  5. Click Yes at the prompt of the message box.

Removing Autostart Entries from the Registry

This solution deletes/modifies registry keys/entries added/modified by this malware. Before performing the steps below, make sure you know how to back up the registry and how to restore it if a problem occurs. Refer to this Microsoft article for more information about modifying your computer's registry.

  1. Open Registry Editor. Click Start>Run, type REGEDIT, then press Enter.
  2. In the left panel, double-click the following:
    HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows>CurrentVersion>
    Run
  3. In the right panel, locate and delete the entry:
    System = "%System%\kernelwind64.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.)
  4. Close Registry Editor.

Deleting the Malware File(s)

  1. Right-click Start then click Search... or Find..., depending on the version of Windows you are running.
  2. In the Named input box, type:
    %System%\dllgh8jkd1q8
  3. In the Look In drop-down list, select the drive that contains Windows, then press Enter.
  4. Once located, select the file then press SHIFT%20DELETE.

Running Trend Micro Antivirus

If you are currently running in safe mode, please restart your computer normally before performing the following solution.

Scan your computer with Trend Micro antivirus and delete files detected as the following:
TROJ_DLOADER.DJD
TROJ_JPGEMBED.A
DIAL_RAS.JS
TROJ_DLOADER.CCT
TROJ_TIBS.ADP
TROJ_DLOADER.FP
TROJ_TIBS.ADQ
TROJ_AGENT.AJRZ
WORM_NUCRYPT.GEN
TROJ_TIBS.ADP
TROJ_TIBS.ADR
WORM_NUCRYPT.GEN
TROJ_TIBS.ADR
TROJ_AGENT.FZJ
TSPY_BZUB.CL

To do this, Trend Micro customers must download the latest virus pattern file and scan their computer. Other Internet users can use HouseCall, the Trend Micro online virus scanner.




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