WORM_REBHIP.MJSN
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Worm
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This worm 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
539,648 bytes
EXE
Yes
19 Mar 2014
Arrival Details
This worm 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 worm drops the following copies of itself into the affected system:
- %Windows%\install\server.exe
(Note: %Windows% is the Windows folder, which is usually C:\Windows.)
It creates the following folders:
- %Windows%\install
(Note: %Windows% is the Windows folder, which is usually C:\Windows.)
Autostart Technique
This worm adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Chrome = "{malware path and file name}"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
HKLM = "%Windows%\install\server.exe"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
HKCU = "%Windows%\install\server.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{MUE41043-D831-D2Y2-IQ2A-P0PI8B463T71}
StubPath = "%Windows%\install\server.exe Restart"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Chrome = "%Windows%\install\server.exe"
Other System Modifications
This worm adds the following registry keys:
HKEY_LOCAL_MACHINE\Software\Microsoft\
Active Setup\Installed Components\{MUE41043-D831-D2Y2-IQ2A-P0PI8B463T71}
HKEY_CURRENT_USER\SOFTWARE\123
It adds the following registry entries:
HKEY_CURRENT_USER\Software\123
FirstExecution = "09/02/2014 -- 08:31"
HKEY_CURRENT_USER\Software\123
NewIdentification = "123"
It deletes the following registry keys:
HKEY_CURRENT_USER\Software\Microsoft\
Active Setup\Installed Components\{MUE41043-D831-D2Y2-IQ2A-P0PI8B463T71}
Dropping Routine
This worm drops the following files:
- %User Temp%\XX--XX--XX.txt
- %User Temp%\XxX.xXx
- %User Temp%\UuU.uUu
- %User Startup%\Chrome.exe
(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.)
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_LOCAL_MACHINE\Software\Microsoft\Active Setup\Installed Components
- {MUE41043-D831-D2Y2-IQ2A-P0PI8B463T71}
- In HKEY_CURRENT_USER\SOFTWARE
- 123
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
- Chrome = "{malware path and file name}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- HKLM = "%Windows%\install\server.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- HKCU = "%Windows%\install\server.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\{MUE41043-D831-D2Y2-IQ2A-P0PI8B463T71}
- StubPath = "%Windows%\install\server.exe Restart"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- Chrome = "%Windows%\install\server.exe"
- In HKEY_CURRENT_USER\Software\123
- FirstExecution = "09/02/2014 -- 08:31"
- In HKEY_CURRENT_USER\Software\123
- NewIdentification = "123"
Step 5
Search and delete these components
- %User Temp%\XX--XX--XX.txt
- %User Temp%\XxX.xXx
- %User Temp%\UuU.uUu
- %User Startup%\Chrome.exe
Step 6
Search and delete this folder
- %Windows%\install
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_REBHIP.MJSN. 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 8
Restore these deleted registry keys/values from backup
*Note: Only Microsoft-related keys/values will be restored. If the malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.
- In HKEY_CURRENT_USER\Software\Microsoft\Active Setup\Installed Components
- {MUE41043-D831-D2Y2-IQ2A-P0PI8B463T71}
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