TROJ_RANSOM.ETK
Trojan:Win32/Dynamer!dtc (Microsoft); Suspicious.Mystic (Symantec); Trojan-Dropper.Win32.Dapato.cdss (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan horse Downloader.Generic13.ASWV (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.
TECHNICAL DETAILS
31,744 bytes
EXE
No
16 May 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.
Other System Modifications
This Trojan deletes the following files:
- {malware path and file name}:zone.identifier:$data
It adds the following registry keys:
HKEY_CLASSES_ROOT\CLSID\{28949824-6737-0594-0930-223283753445}\
InProcServer32
HKEY_CLASSES_ROOT\*\shellex\
ContextMenuHandlers\{28949824-6737-0594-0930-223283753445}
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{28949824-6737-0594-0930-223283753445}\InProcServer32
ThreadingModel = "Apartment"
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{750fdf0e-2a26-11d1-a3ea-080036587f03}\InProcServer32
ThreadingModel = "Apartment"
(Note: The default value data of the said registry entry is Apartment.)
Other Details
This Trojan connects to the following possibly malicious URL:
- http://{BLOCKED}inco.com/dUTKQ5lmQmxjbyxib213ZWxZcmVpbmM=
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
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_CLASSES_ROOT\CLSID\{28949824-6737-0594-0930-223283753445}
- InProcServer32
- In HKEY_CLASSES_ROOT\*\shellex\ContextMenuHandlers
- {28949824-6737-0594-0930-223283753445}
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_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{28949824-6737-0594-0930-223283753445}\InProcServer32
- ThreadingModel = "Apartment"
Step 4
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\Classes\CLSID\{750fdf0e-2a26-11d1-a3ea-080036587f03}\InProcServer32
- From: ThreadingModel = "Apartment"
To: ThreadingModel = ""Apartment""
- From: ThreadingModel = "Apartment"
Step 5
Scan your computer with your Trend Micro product to delete files detected as TROJ_RANSOM.ETK. 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 6
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.
- {malware path and file name}:zone.identifier:$data
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