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This Trojan is a ransomware using fake digital certificates to avoid digital signing checks.
To get a one-glance comprehensive view of the behavior of this Trojan, refer to the Threat Diagram shown below.
For the related story, you may read the blog post Ransomware Bears Fake Digital Signature
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 modifies the Internet Explorer Zone Settings.
It connects to certain websites to send and receive information.
This Trojan drops the following component file(s):
It injects codes into the following process(es):
This Trojan drops the following shortcut pointing to its copy in the User Startup folder to enable its automatic execution at every system startup:
Other System Modifications
This Trojan adds the following registry entries:
HKEY_CURRENT_USER\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\02500 = "3"
HKEY_CURRENT_USER\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\12500 = "3"
HKEY_CURRENT_USER\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\22500 = "3"
HKEY_CURRENT_USER\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\32500 = "3"
HKEY_CURRENT_USER\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\42500 = "3"
HKEY_CURRENT_USER\Software\Microsoft\Internet\Explorer\MainNoProtectedBanner = "1"
It modifies the following registry entries:
HKEY_CURRENT_USER\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\01609 = "0"
(Note: The default value data of the said registry entry is 1.)
HKEY_CURRENT_USER\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\11609 = "0"
HKEY_CURRENT_USER\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\21609 = "0"
HKEY_CURRENT_USER\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\31609 = "0"
HKEY_CURRENT_USER\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\41609 = "0"
This Trojan terminates the following processes if found running in the affected system's memory:
Web Browser Home Page and Search Page Modification
This Trojan modifies the Internet Explorer Zone Settings.
This Trojan connects to the following website to send and receive information:
Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.
Restart in Safe Mode
To restart in Safe Mode:
• For Windows 2000 users
• For Windows XP users
• For Windows Server 2003 users
• For Windows Vista and Windows 7 users
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.
To delete the registry value this malware created:
Restore this modified registry value
To restore the registry value this malware/grayware modified:
Search and delete these files
To delete malware/grayware files:
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_RANSOM.SMJA. 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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