TROJ_TIBS.II

Malware type: Trojan

Aliases: Trojan-Downloader.Win32.Tibs.tc (Kaspersky), Tibs-Packed (McAfee), Downloader.MisleadApp (Symantec), Worm/Zhelatin.ok (Avira), Mal/TibsPk-A (Sophos), Trojan:Win32/Tibs.gen!ldr (Microsoft)

In the wild: Yes

Destructive: No

Language: English

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

Encrypted: No

Overall risk rating:

Reported infections:

Damage potential:

Medium

Distribution potential:

Low

Description: 

This Trojan usually arrives as a file dropped by other malware or as a file downloaded unknowingly by a user when visiting malicious Web sites.

It connects to the URLs, http://count4al{BLOCKED}NQ0G&code2=4490 and http://count4al{BLOCKED}NQ0G&code2=4490&code3= to download the following files:

Moreover, it disables the Task Manager by setting a certain registry entry.

For additional information about this threat, see:

Description created: Jul. 20, 2006 11:37:48 PM GMT -0800


TECHNICAL DETAILS


File type: PE

Memory resident:  Yes

Size of malware: 7,792 Bytes (compressed); 36,352 Bytes (uncompressed)

Initial samples received on: Jul 19, 2006

Related toTROJ_TIBS.JL, TROJ_TIBS.JK, TROJ_GALAPOPE.AB, TROJ_CLICKER.CU

Payload 1: Downloads files

Details:

This Trojan usually arrives as a file dropped by other malware or as a file downloaded unknowingly by a user when visiting malicious Web sites.

Upon execution, it drops a copy of itself as KERNELS8.EXE in the Windows system folder. It then creates the following registry entries to ensure its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
System = "%System%\kernels8.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\RunServices
SystemTools = "%System%\kernels8.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, and C:\Windows\System32 on Windows XP and Server 2003.)

It also disables Task Manager, which makes its detection and removal more difficult, by setting the following registry entry:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\System
DisableTaskMgr = "dword:00000001"

(Note: The default value of the said entry is "dword:00000000".)

This Trojan connects to the URLs, http://count4al{BLOCKED}NQ0G&code2=4490 and http://count4al{BLOCKED}NQ0G&code2=4490&code3= to download the following files:

This Trojan runs on Windows 98, ME, NT, 2000, XP, and Server 2003.

Analysis By: Jay-R Tan

Revision History:

First pattern file version: 3.580.04
First pattern file release date: Jul 19, 2006

SOLUTION


Minimum scan engine version needed: 7.500

Pattern file needed: 5.543.00

Pattern release date: Sep 15, 2008


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:

Note: To fully remove all associated malware, perform the clean solutions for the following:

Identifying the Malware Program

To remove this malware, first identify the malware program.

  1. Scan your computer with your Trend Micro antivirus product.
  2. NOTE the path and file name of all files detected as TROJ_TIBS.II.

Trend Micro customers need to download the latest virus pattern file before scanning their computer. Other users can use Housecall, the Trend Micro online virus scanner.

Terminating the Malware Program

Since this malware disables the Windows Task Manager, it is necessary to use third party process viewers such as Process Explorer.

  1. Download Process Explorer.
  2. Extract the contents of the compressed (ZIP) file to a location of your choice.
  3. Execute Process Explorer by double-clicking procexp.exe.
  4. In the Process Explorer window, locate the process:
    {Malware file name detected earlier}
  5. Right-click the malware process, then click Kill Process Tree.
  6. Close Process Explorer.

*NOTE: On computers running all Windows platforms, if the process you are looking for is not in the list displayed by Process Explorer, continue with the next solution procedure, noting additional instructions. If the malware process is in the list displayed by Process Explorer, but you are unable to terminate it, restart your computer in safe mode.

Editing the Registry

This malware modifies the computer's registry. Users affected by this malware may need to modify or delete specific registry keys or entries. For detailed information regarding registry editing, please refer to the following articles from Microsoft:

  1. HOW TO: Backup, Edit, and Restore the Registry in Windows 95, Windows 98, and Windows ME
  2. HOW TO: Backup, Edit, and Restore the Registry in Windows NT 4.0
  3. HOW TO: Backup, Edit, and Restore the Registry in Windows 2000
  4. HOW TO: Back Up, Edit, and Restore the Registry in Windows XP and Server 2003

Removing Autostart Entries from the Registry

Removing autostart entries from the registry prevents the malware from executing at startup.

If the registry entries below are not found, the malware may not have executed as of detection. If so, proceed to the succeeding solution set.

  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%\kernels8.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, and C:\Windows\System32 on Windows XP and Server 2003.)
  4. In the left panel, double-click the following:
    HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>
    Windows>CurrentVersion>RunServices
  5. In the right panel, locate and delete the entry:
    System = "%System%\kernels8.exe"

Enabling Task Manager

  1. Still in Registry Editor, in the left panel, double-click the following:
    HKEY_CURRENT_USER>Software>Microsoft>
    Windows>CurrentVersion>Policies>System
  2. In the right panel, locate the entry:
    DisableTaskMgr = "dword:00000001"
  3. Right-click on this registry entry and choose Modify. Change the value of this entry to:
    DisableTaskMgr = "dword:00000000"
  4. Close Registry Editor.

Deleting Malware Files

  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:
    dlh9jkdq8.exe
  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 Delete.
  5. Repeat steps 2-4 to delete the following files:
    • dlh9jkdq1.exe
    • vx.tll

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).

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 TROJ_TIBS.II. 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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