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TROJ_JORIK.ENG

June 07, 2013
 ALIASES:

Backdoor:Win32/Zegost.AD(Microsoft),Trojan.Win32.Jorik.FirstInj.aam(Kaspersky),Trojan.Win32.Bdoor.bdk (v)(Sunbelt)

 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

  OVERVIEW

This Trojan deletes itself after execution.

  TECHNICAL DETAILS

File Size:

196,608 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

05 Jun 2013

Installation

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

  • %Windows%\XXXXXXF02C8725\svchsot.exe

(Note: %Windows% is the Windows folder, which is usually C:\Windows.)

It drops the following files:

  • %Windows%\system32\F02C8725.key

(Note: %Windows% is the Windows folder, which is usually C:\Windows.)

It creates the following folders:

  • %Windows%\XXXXXXF02C8725

(Note: %Windows% is the Windows folder, which is usually C:\Windows.)

Autostart Technique

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
XXXXXXF02C8725 = "%Windows%\XXXXXXF02C8725\svchsot.exe"

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}eo.eicp.net

It deletes itself after execution.

  SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

9.962.03

FIRST VSAPI PATTERN DATE:

05 Jun 2013

VSAPI OPR PATTERN File:

9.963.00

VSAPI OPR PATTERN Date:

06 Jun 2013

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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • XXXXXXF02C8725 = "%Windows%\XXXXXXF02C8725\svchsot.exe"

Step 4

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.
  • %Windows%\XXXXXXF02C8725

Step 5

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.
  • %Windows%\system32\F02C8725.key

Step 6

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