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TROJ_KBOYDLDR.ZTBJ-A

October 15, 2014
 Analysis by: Abraham Latimer Camba
 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Dropped by other malware


This Trojan may be dropped by other malware.

It connects to certain websites to send and receive information.

  TECHNICAL DETAILS

File Size:

81,920 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

08 Oct 2014

Payload:

Compromises system security, Steals information, Downloads files

Arrival Details

This Trojan may be dropped by the following malware:

  • TROJ_MDROPPER.ZTBJ-AA

Installation

This Trojan drops the following copies of itself into the affected system and executes them:

  • %Application Data%\Microsoft\Credentials\Credentials.exe

(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

It creates the following folders:

  • %Application Data%\Tasks

(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

Download Routine

This Trojan connects to the following website(s) to download and execute a malicious file:

  • http://{BLOCKED}.{BLOCKED}.60.30:8080/images/ph-14-01.jpg
  • http://{BLOCKED}.{BLOCKED}.60.30:8080/images/ph-14-01.6.jpg
  • http://{BLOCKED}.{BLOCKED}.60.30:8080/images/ph-14-01.24.jpg
  • http://{BLOCKED}.{BLOCKED}.60.30/images/ph-14-01.jpg
  • http://{BLOCKED}.{BLOCKED}.60.30/images/ph-14-01.6.jpg
  • http://{BLOCKED}.{BLOCKED}.60.30/images/ph-14-01.24.jpg
  • http://{BLOCKED}.{BLOCKED}.193.80/images/ph-14-01.jpg
  • http://{BLOCKED}.{BLOCKED}.193.80/images/ph-14-01.6.jpg
  • http://{BLOCKED}.{BLOCKED}.193.80/images/ph-14-01.24.jpg

It saves the files it downloads using the following names:

  • %Application Data%\Tasks\up{random numbers}.msi

(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

Other Details

This Trojan connects to the following website to send and receive information:

  • http://{BLOCKED}.{BLOCKED}.60.30:8080
  • http://{BLOCKED}.{BLOCKED}.60.30
  • http://{BLOCKED}.{BLOCKED}.193.80

NOTES:

It sends the following information to the said websites:

  • Computer Name
  • Detected AV process
  • Microsoft Internet Explorer Version
  • Microsoft Office Version
  • OS Build Number
  • OS Major Version
  • OS Minor Version

It checks for the presence of the following AV related processes:

  • 360rp.exe
  • 360tray.exe
  • ALMon.exe
  • ALsvc.exe
  • ashserv.exe
  • Avastsvc.exe
  • avgam.exe
  • avguard.exe
  • avp.exe
  • avpmapp.exe
  • consctl.exe
  • CyberoamClient.exe
  • econceal.exe
  • econser.exe
  • ekrn.exe
  • escanmon.exe
  • mcshield.exe
  • nod32krn.exe
  • pccntmon.exe
  • rtvscan.exe
  • SAVAdminService.exe
  • SavService.exe
  • sfctlcom.exe
  • swi_service.exe
  • uiwatchdog.exe

  SOLUTION

Minimum Scan Engine:

9.700

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

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Remove the malware/grayware file that dropped/downloaded TROJ_KBOYDLDR.ZTBJ-A. (Note: Please skip this step if the threat(s) listed below have already been removed.)

    • TROJ_MDROPPER.ZTBJ-AA

Step 4

Identify and terminate files detected as TROJ_KBOYDLDR.ZTBJ-A

[ Learn More ]
  1. Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
  2. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  3. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 5

Search and delete this folder

[ 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.  
  • %Application Data%\Tasks

Step 6

Search and delete these files

[ Learn More ]
There may be some 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.
  • %Application Data%\Microsoft\Credentials\Credentials.dat

Step 7

Scan your computer with your Trend Micro product to delete files detected as TROJ_KBOYDLDR.ZTBJ-A. 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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