TROJ_INJECT.PFL

 Analysis by: Jaime Benigno Reyes

 ALIASES:

VirTool:Win32/Injector.gen!CQ (Microsoft)

 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 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:

55,296 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

14 Oct 2014

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:

  • %System Root%\Users\Public\HEX-5823-6893-6818\jusched.exe (Windows Vista and higher versions)
  • %Application Data%\HEX-5823-6893-6818\jusched.exe (Versions lower than Windows Vista)

(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.. %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:

  • %System Root%\Users\Public\HEX-5823-6893-6818 (Windows Vista and higher versions)
  • %Application Data%\HEX-5823-6893-6818 (Versions lower than Windows Vista)

(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.. %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.)

Autostart Technique

This Trojan adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Java Update Manager = "%System Root%\Users\Public\HEX-5823-6893-6818\jusched.exe" (Windows Vista and higher versions)

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Java Update Manager = "%Application Data%\HEX-5823-6893-6818\jusched.exe" (Versions lower than Windows Vista)

Other System Modifications

This Trojan adds the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%System Root%\Users\Public\HEX-5823-6893-6818\jusched.exe = "%System Root%\Users\Public\HEX-5823-6893-6818\jusched.exe:*:Enabled:Java Update Manager" (Versions lower than Windows Vista)

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%Application Data%\HEX-5823-6893-6818\jusched.exe = "%Application Data%\HEX-5823-6893-6818\jusched.exe:*:Enabled:Java Update Manager" (Versions lower than Windows Vista)

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}ed.{BLOCKED}dio.net

  SOLUTION

Minimum Scan Engine:

9.700

FIRST VSAPI PATTERN FILE:

11.210.04

FIRST VSAPI PATTERN DATE:

14 Oct 2014

VSAPI OPR PATTERN File:

11.213.00

VSAPI OPR PATTERN Date:

15 Oct 2014

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

Identify and terminate files detected as TROJ_INJECT.PFL

[ 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 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\Microsoft\Windows\CurrentVersion\Run
    • Java Update Manager = "%System Root%\Users\Public\HEX-5823-6893-6818\jusched.exe" (Windows Vista and higher versions)
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • Java Update Manager = "%Application Data%\HEX-5823-6893-6818\jusched.exe" (Versions lower than Windows Vista)
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
    • %System Root%\Users\Public\HEX-5823-6893-6818\jusched.exe = "%System Root%\Users\Public\HEX-5823-6893-6818\jusched.exe:*:Enabled:Java Update Manager" (Versions lower than Windows Vista)
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
    • %Application Data%\HEX-5823-6893-6818\jusched.exe = "%Application Data%\HEX-5823-6893-6818\jusched.exe:*:Enabled:Java Update Manager" (Versions lower than Windows Vista)

Step 5

Search and delete these folders

[ 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.  
  • %System Root%\Users\Public\HEX-5823-6893-6818 (Windows Vista and higher versions)
  • %Application Data%\HEX-5823-6893-6818 (Versions lower than Windows Vista)

Step 6

Scan your computer with your Trend Micro product to delete files detected as TROJ_INJECT.PFL. 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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