TROJ_SISRON.DT
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
257,616 bytes
EXE
Yes
07 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 creates the following folders:
- %User Profile%\Application Data\Window modus
(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
Window modus = "%User Profile%\Window modus\Window modus.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
Window modus = "%User Profile%\Window modus\Window modus.exe"
Other System Modifications
This Trojan adds the following registry keys:
HKEY_CURRENT_USER\SOFTWARE\GOMSEK.COM\
Window modus
HKEY_CURRENT_USER\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Window modus
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
AppID\{FD532C54-FC82-4C97-9E7C-FB4397203A44}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
AppID\WindowmodusUpdateService.EXE
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{2402B2ED-0F0A-4E5F-89A2-8BD09140352C}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{2402B2ED-0F0A-4E5F-89A2-8BD09140352C}\1.0
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{2402B2ED-0F0A-4E5F-89A2-8BD09140352C}\1.0\
FLAGS
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{2402B2ED-0F0A-4E5F-89A2-8BD09140352C}\1.0\
0
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{2402B2ED-0F0A-4E5F-89A2-8BD09140352C}\1.0\
0\win32
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{2402B2ED-0F0A-4E5F-89A2-8BD09140352C}\1.0\
HELPDIR
It adds the following registry entries:
HKEY_CURRENT_USER\Software\GOMSEK.COM\
Window modus
ProgID = "28DD95F28429D0418D72BB60470C7C8C"
HKEY_CURRENT_USER\Software\GOMSEK.COM\
Window modus
Owner = "k10000"
HKEY_CURRENT_USER\Software\GOMSEK.COM\
Window modus
Version = "1309300"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
Window modus
DisplayName = "Window modus"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
Window modus
Publisher = "°Ë»ö´åÄÄ"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
Window modus
UninstallString = "%User Profile%\Window modus\Window modus.exe -uninstall"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
AppID\WindowmodusUpdateService.EXE
AppID = "{FD532C54-FC82-4C97-9E7C-FB4397203A44}"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
AppID\{FD532C54-FC82-4C97-9E7C-FB4397203A44}
LocalService = "WindowmodusUpdateService"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
AppID\{FD532C54-FC82-4C97-9E7C-FB4397203A44}
ServiceParameters = "-Service"
Dropping Routine
This Trojan drops the following files:
- %User Profile%\Window modus\Window modus.exe
- %User Profile%\Window modus\WindowmodusUpdateService.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.)
Other Details
This Trojan connects to the following possibly malicious URL:
- http://directkeyword.{BLOCKED}o.kr/daemon/ServiceReport.php?m=0050569F69F4&t=I&q=
- http://directkeyword.{BLOCKED}o.kr/daemon/ServiceReport.php?m=0050569F69F4&t=B
- http://directkeyword.{BLOCKED}o.kr/daemon/SetActiveCount_new.php?{random characters}
- http://directkeyword.{BLOCKED}o.kr/update/install2.php?{random characters}
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\GOMSEK.COM
- Window modus
- In HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall
- Window modus
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\AppID
- {FD532C54-FC82-4C97-9E7C-FB4397203A44}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\AppID
- WindowmodusUpdateService.EXE
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib
- {2402B2ED-0F0A-4E5F-89A2-8BD09140352C}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{2402B2ED-0F0A-4E5F-89A2-8BD09140352C}
- 1.0
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{2402B2ED-0F0A-4E5F-89A2-8BD09140352C}\1.0
- FLAGS
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{2402B2ED-0F0A-4E5F-89A2-8BD09140352C}\1.0
- 0
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{2402B2ED-0F0A-4E5F-89A2-8BD09140352C}\1.0\0
- win32
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{2402B2ED-0F0A-4E5F-89A2-8BD09140352C}\1.0
- HELPDIR
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\Run
- Window modus = "%User Profile%\Window modus\Window modus.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- Window modus = "%User Profile%\Window modus\Window modus.exe"
- In HKEY_CURRENT_USER\Software\GOMSEK.COM\Window modus
- ProgID = "28DD95F28429D0418D72BB60470C7C8C"
- In HKEY_CURRENT_USER\Software\GOMSEK.COM\Window modus
- Owner = "k10000"
- In HKEY_CURRENT_USER\Software\GOMSEK.COM\Window modus
- Version = "1309300"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall\Window modus
- DisplayName = "Window modus"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall\Window modus
- Publisher = "°Ë»ö´åÄÄ"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall\Window modus
- UninstallString = "%User Profile%\Window modus\Window modus.exe -uninstall"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\AppID\WindowmodusUpdateService.EXE
- AppID = "{FD532C54-FC82-4C97-9E7C-FB4397203A44}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\AppID\{FD532C54-FC82-4C97-9E7C-FB4397203A44}
- LocalService = "WindowmodusUpdateService"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\AppID\{FD532C54-FC82-4C97-9E7C-FB4397203A44}
- ServiceParameters = "-Service"
Step 5
Search and delete these components
- %User Profile%\Window modus\Window modus.exe
- %User Profile%\Window modus\WindowmodusUpdateService.exe
Step 6
Search and delete this folder
- %User Profile%\Application Data\Window modus
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_SISRON.DT. 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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