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TROJ_JORIK.DNJ

June 03, 2013
 Analysis by: Jimelle Monteser
 ALIASES:

Troj/Agent-XHF (Sophos_Lite), W32/Jorik_Totem.VG!tr (Fortinet), Trojan.Wind32.Jorik.Totem.vg (Kaspersky), VirTool:Wind32/Obfuscator.AAC (Microsoft), W32.Pilleuz (Norton)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  TECHNICAL DETAILS

File Size:

95,160 bytes

File Type:

, EXE

Memory Resident:

Yes

Initial Samples Received Date:

02 Aug 2012

Installation

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

  • %User Profile%\voruvuhypyfc.exe

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)

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
voruvuhypyfc = "%User Profile%\voruvuhypyfc.exe"

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}s.com/
  • http://{BLOCKED}omes.org/?xclzve_AFKPUZejpuz49EJOTYdioty38DINSX
  • http://{BLOCKED}fc.com/
  • http://{BLOCKED}usic.pl/?xclzve_sx27CHMRWbglrw16BGMRWbglrw16BG
  • http://{BLOCKED}industries.com
  • http://{BLOCKED}tingchum.com/?xclzve_Ydioty38DINSXchmsy38DINSXchmsx
  • http://{BLOCKED}t.{BLOCKED}ust.com/AddTrustExternalCARoot.p7c -- >
  • http://fw.{BLOCKED}k.com/?&publicid=72b67aeb-32ba-4635-be5a-30d584ab8336&domainname={BLOCKED}tingchum.com
  • http://www.{BLOCKED}ogo.com/?xclzve_6CHMRWbglsx27CHMRWbhmsx27CHMSX
  • http://www.{BLOCKED}rinting.com/
  • http://www.{BLOCKED}ting-education.com/
  • http://www.{BLOCKED}l.net/
  • http://ww38.{BLOCKED}t.com/

  SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

9.302.02

FIRST VSAPI PATTERN DATE:

03 Aug 2012

VSAPI OPR PATTERN File:

9.303.00

VSAPI OPR PATTERN Date:

04 Aug 2012

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

Restart in Safe Mode

[ Learn More ]

Step 3

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
    • voruvuhypyfc = "%UserProfile%\voruvuhypyfc.exe"

Step 4

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_JORIK.DNJ. 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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