TROJ_RANSOM.JGX
Windows 2000, Windows XP, Windows Server 2003
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
840,704 bytes
EXE
Yes
13 Dec 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%\application data\{malware file name}
- %User Profile%\Microsoft\Msword.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%\Microsoft\Backups
(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\RunOnce
Shell = "%User Profile%\application data\{malware file name}"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
microsoft word = "%User Profile%\Microsoft\Msword.exe"
Other System Modifications
This Trojan modifies the following file(s):
- %User Profile%\Application Data\Microsoft
(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 deletes the following files:
- :Zone.Identifier
- %User Profile%\application data\{malware file name}:zone.identifier
- %Windows%\Microsoft.NET\Framework\v2.0.50727\config\security.config.cch.1860.264828
- %Windows%\Microsoft.NET\Framework\v2.0.50727\config\enterprisesec.config.cch.1860.264828
- %User Profile%\v2.0.50727.42\security.config.cch.1860.265078
- %User Startup%\{malware file name}:zone.identifier
- %User Temp%\logmail.txt
(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.. %Windows% is the Windows folder, which is usually C:\Windows.. %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.. %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_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\RunOnce
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows Script Host\Settings
Enabled = "1"
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
SystemCertificates\CA\Certificates\
FE622EA7B33CA46519AB39736A66B8F6E41FF157
Blob = "{random values}"
(Note: The default value data of the said registry entry is {random values}.)
Dropping Routine
This Trojan drops the following files:
- %User Temp%\1.vbs
- %User Profile%\Microsoft\Crypto
- %User Profile%\Crypto\RSA
- %User Profile%\RSA\S-1-5-21-1645522239-1292428093-682003330-1003
- %User Temp%\logff.txt
- %User Startup%\{malware file name}
(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 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 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.)
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
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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion
- RunOnce
Step 4
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\RunOnce
- Shell = "%User Profile%\application data\{malware file name}"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- microsoft word = "%User Profile%\Microsoft\Msword.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows Script Host\Settings
- Enabled = "1"
Step 5
Restore these modified registry values
Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\SystemCertificates\CA\Certificates\FE622EA7B33CA46519AB39736A66B8F6E41FF157
- From: Blob = "{random values}"
To: Blob = ""{random values}""
- From: Blob = "{random values}"
Step 6
Search and delete these components
- %User Temp%\1.vbs
- %User Profile%\Microsoft\Crypto
- %User Profile%\Crypto\RSA
- %User Profile%\RSA\S-1-5-21-1645522239-1292428093-682003330-1003
- %User Temp%\logff.txt
- %User Startup%\{malware file name}
Step 7
Search and delete this folder
- %User Profile%\Microsoft\Backups
Step 8
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_RANSOM.JGX. 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 deleted/modified files and/or registry entries from backup
*Note: Only Microsoft-related files/keys/values will be restored. If this malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.
- %User Profile%\Application Data\Microsoft
Step 10
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.
- :Zone.Identifier
- %User Profile%\application data\{malware file name}:zone.identifier
- %Windows%\Microsoft.NET\Framework\v2.0.50727\config\security.config.cch.1860.264828
- %Windows%\Microsoft.NET\Framework\v2.0.50727\config\enterprisesec.config.cch.1860.264828
- %User Profile%\v2.0.50727.42\security.config.cch.1860.265078
- %User Startup%\{malware file name}:zone.identifier
- %User Temp%\logmail.txt
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