TROJ_JORIK.DOF
TrojanDownloader:Win32/Cutwail.BE (Microsoft), Win32/Wigon.OW trojan (ESET), Trojan-Dropper.Win32.Injector (Ikarus)
Windows 2000, Windows XP, Windows Server 2003
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Trojan
Destructiveness: No
Encrypted: Yes
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
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:
- %User Profile%\z665hqsuqv.exe
(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)
Autostart Technique
This Trojan creates the following registry entries to enable automatic execution of dropped component at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
z665hqsuqv = "%User Profile%\z665hqsuqv.exe"
Other System Modifications
This Trojan also creates the following registry entry(ies) as part of its installation routine:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion
z665hqsuqv = "{hex values}"
Other Details
This Trojan connects to the following possibly malicious URL:
- http://{BLOCKED}.{BLOCKED}.99.38
- {BLOCKED}at.com
- {BLOCKED}r.com
- {BLOCKED}lj.com
- {BLOCKED}a.com
- {BLOCKED}dk.com
- {BLOCKED}mcy.com
- {BLOCKED}ld.com
- {BLOCKED}q.com
- {BLOCKED}qe.com
- {BLOCKED}f.com
- {BLOCKED}vhg.com
SOLUTION
Step 1
For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.
Step 2
Restart in Safe Mode
Step 3
Delete this registry value
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
- z665hqsuqv = "%User Profile%\z665hqsuqv.exe"
- z665hqsuqv = "%User Profile%\z665hqsuqv.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion
- z665hqsuqv = "{hex values}"
- z665hqsuqv = "{hex values}"
Step 4
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_JORIK.DOF. 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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