TROJ_JORIK.EAT
TrojanDownloader:Win32/Dofoil.R (Microsoft); Trojan.Ransomlock.AA (Symantec); Trojan.Win32.Jorik.Mokes.csk (Kaspersky); Trojan-Downloader.Win32.Dofoil (Sunbelt); Trojan horse Generic6_c.CPFY (AVG)
Windows 2000, Windows XP, Windows Server 2003
![](/vinfo/imgFiles/legend.jpg)
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.
It disables Task Manager, Registry Editor, and Folder Options.
TECHNICAL DETAILS
290,672 bytes
EXE
Yes
18 Feb 2013
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%\BDFF95\BDFF95.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.)
It creates the following folders:
- %User Profile%\Application Data\BDFF95
(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
2 = "%User Temp%\2.tmp"
Other System Modifications
This Trojan deletes the following files:
- %User Profile%\BDFF95\BDFF95.exe
- %User Profile%\BDFF95\BDFF95.exe:Zone.Identifier
- %User Temp%\2.tmp
(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.. %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)
It adds the following registry keys:
HKEY_LOCAL_MACHINE\SYSTEM\SOFTWARE\
Microsoft\Security Center
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\Run
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile
EnableFirewall = "1"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile
DisableNotifications = "1"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile
DoNotAllowExceptions = "1"
HKEY_LOCAL_MACHINE\SYSTEM\SOFTWARE\
Microsoft\Security Center
FirstRunDisabled = "0"
HKEY_LOCAL_MACHINE\SYSTEM\SOFTWARE\
Microsoft\Security Center
AntiVirusDisableNotify = "0"
HKEY_LOCAL_MACHINE\SYSTEM\SOFTWARE\
Microsoft\Security Center
FirewallDisableNotify = "0"
HKEY_LOCAL_MACHINE\SYSTEM\SOFTWARE\
Microsoft\Security Center
UpdatesDisableNotify = "0"
HKEY_LOCAL_MACHINE\SYSTEM\SOFTWARE\
Microsoft\Security Center
AntiVirusOverride = "0"
HKEY_LOCAL_MACHINE\SYSTEM\SOFTWARE\
Microsoft\Security Center
FirewallOverride = "0"
It creates the following registry entry(ies) to disable Task Manager, Registry Tools and Folder Options:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\Run
Classes = "%User Profile%\BDFF95\BDFF95.exe"
Dropping Routine
This Trojan drops the following files:
- %User Temp%\aut1.tmp
- %User Temp%\uvdtffy
- %User Startup%\2.lnk
(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.. %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup.)
Other Details
This Trojan connects to the following possibly malicious URL:
- http://{BLOCKED}t.in/?{random characters}
- http://{BLOCKED}t.in/?8080
This report is generated via an automated analysis system.
SOLUTION
9.300
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
Step 3
Enable Registry Editor, Task Manager, and Folder options
Step 4
Delete this registry key
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\SYSTEM\SOFTWARE\Microsoft
- Security Center
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
- Run
Step 5
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
- 2 = "%User Temp%\2.tmp"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile
- EnableFirewall = "1"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile
- DisableNotifications = "1"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile
- DoNotAllowExceptions = "1"
- In HKEY_LOCAL_MACHINE\SYSTEM\SOFTWARE\Microsoft\Security Center
- FirstRunDisabled = "0"
- In HKEY_LOCAL_MACHINE\SYSTEM\SOFTWARE\Microsoft\Security Center
- AntiVirusDisableNotify = "0"
- In HKEY_LOCAL_MACHINE\SYSTEM\SOFTWARE\Microsoft\Security Center
- FirewallDisableNotify = "0"
- In HKEY_LOCAL_MACHINE\SYSTEM\SOFTWARE\Microsoft\Security Center
- UpdatesDisableNotify = "0"
- In HKEY_LOCAL_MACHINE\SYSTEM\SOFTWARE\Microsoft\Security Center
- AntiVirusOverride = "0"
- In HKEY_LOCAL_MACHINE\SYSTEM\SOFTWARE\Microsoft\Security Center
- FirewallOverride = "0"
Step 6
Search and delete these components
- %User Temp%\aut1.tmp
- %User Temp%\uvdtffy
- %User Startup%\2.lnk
Step 7
Search and delete this folder
- %User Profile%\Application Data\BDFF95
Step 8
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_JORIK.EAT. 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.
Step 9
Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.
- %User Profile%\BDFF95\BDFF95.exe
- %User Profile%\BDFF95\BDFF95.exe:Zone.Identifier
- %User Temp%\2.tmp
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