TROJ_DOWNADJOB.AF

July 05, 2018
 Analysis by: Carl Maverick Pascual
 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan requires its main component to successfully perform its intended routine.

  TECHNICAL DETAILS

File Size:

274 bytes

File Type:

JOB

Memory Resident:

No

Initial Samples Received Date:

04 Jul 2018

Other Details

This Trojan requires its main component to successfully perform its intended routine.

It adds the following scheduled tasks:

  • {Task Name}
    • Executes at 4:00PM every Mon, Tue, Wed, Thu, Fri, Sat, Sun of every week, starting 07/03/2018
    • Executes the command:
      • rundll32.exe czuil.h,vbofqpm

NOTES:
This is the Trend Micro detection for JOB files dropped by WORM_DOWNAD variants. The said scheduled task enables the malware copy to be automatically executed at a specific time and day.

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

14.360.01

FIRST VSAPI PATTERN DATE:

05 Jul 2018

VSAPI OPR PATTERN File:

14.361.00

VSAPI OPR PATTERN Date:

06 Jul 2018

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

Deleting Scheduled Tasks

The following {Task Name} - {Task to be run} listed should be used in the steps identified below:

  • {Task Name} - "rundll32.exe czuil.h,vbofqpm"

For Windows 2000, Windows XP, and Windows Server 2003:

  1. Open the Windows Scheduled Tasks. Click Start>Programs>Accessories>
    System Tools>Scheduled Tasks.
  2. Locate each {Task Name} values listed above in the Name column.
  3. Right-click on the said file(s) with the aforementioned value.
  4. Click on Properties. In the Run field, check for the listed {Task to be run}.
  5. If the strings match the list above, delete the task.

For Windows Vista, Windows 7, Windows Server 2008, Windows 8, Windows 8.1, and Windows Server 2012:

  1. Open the Windows Task Scheduler. To do this:
    • On Windows Vista, Windows 7, and Windows Server 2008, click Start, type taskschd.msc in the Search input field, then press Enter.
    • On Windows 8, Windows 8.1, and Windows Server 2012, right-click on the lower left corner of the screen, click Run, type taskschd.msc, then press Enter.
  2. In the left panel, click Task Scheduler Library.
  3. In the upper-middle panel, locate each {Task Name} values listed above in the Name column.
  4. In the lower-middle panel, click the Actions tab. In the Details column, check for the {Task to be run} string.
  5. If the said string is found, delete the task.

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_DOWNADJOB.AF. 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 the following Trend Micro Support pages for more information:


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