WORM_KELIHOS.ALG
Windows 2000, Windows XP, Windows Server 2003
![](/vinfo/imgFiles/legend.jpg)
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
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.
Autostart Technique
This worm adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
NetworkNotifyer = "{malware path and file name}"
Other System Modifications
This worm adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Notepad
persistentLocalizedName = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
ActiveModifiedTheme = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Shell Folders
DefaultCompressedRecord = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
Notepad
lineLoadedQuick = "DIq1pQKwPSN4hvxoUBXGk6yOCDrLgM3Y7fZPT/IwntE1n4uLvcqN09CYEh2EQC4S7w=="
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
SizeCompletedValid = "DIq1pQKwPSN4hvxoUBXGk6yOCDrLgM3Y7fZPT/IwntE1n4uLvcqN09CYEh2EQC4S7w=="
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Shell Folders
RecordModifiedMax = "DIq1pQKwPSN4hvxoUBXGk6yOCDrLgM3Y7fZPT/IwntE1n4uLvcqN09CYEh2EQC4S7w=="
HKEY_CURRENT_USER\Software\Microsoft\
Notepad
recordEnabledCheck = "5"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
StyleModifiedPrev = "5"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Shell Folders
UrlEnabledUse = "5"
HKEY_CURRENT_USER\Software\Microsoft\
Notepad
platformCompressedValid = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
InfoPlayedCurrent = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Shell Folders
FlagsModifiedValid = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
Notepad
dBSavedUse = "{random values}"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Internet Explorer\Main
Check_Associations = "no"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Internet Explorer\Main
NoProtectedModeBanner = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
Check_Associations = "no"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
NoProtectedModeBanner = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Internet Explorer\Main
IE8RunOnceCompletionTime = "{random values}"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Internet Explorer\Main
IE8RunOnceLastShown = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Internet Explorer\Main
IE8RunOnceLastShown_TIMESTAMP = "{random values}"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Internet Explorer\Main
IE8RunOncePerInstallCompleted = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Internet Explorer\Main
IE8TourShown = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Internet Explorer\Main
IE8TourShownTime = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
IE8RunOnceCompletionTime = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
IE8RunOnceLastShown = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
IE8RunOnceLastShown_TIMESTAMP = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
IE8RunOncePerInstallCompleted = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
IE8TourShown = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
IE8TourShownTime = "{random values}"
Dropping Routine
This worm drops the following files:
- %System Root%\tmp.exe
- %System%\Packet.dll
- %System%\wpcap.dll
- %System%\drivers\npf.sys
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %System% is the Windows system folder, which is usually C:\Windows\System32.)
This report is generated via an automated analysis system.
SOLUTION
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 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\Microsoft\Windows\CurrentVersion\Run
- NetworkNotifyer = "{malware path and file name}"
- In HKEY_CURRENT_USER\Software\Microsoft\Notepad
- persistentLocalizedName = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
- ActiveModifiedTheme = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders
- DefaultCompressedRecord = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Notepad
- lineLoadedQuick = "DIq1pQKwPSN4hvxoUBXGk6yOCDrLgM3Y7fZPT/IwntE1n4uLvcqN09CYEh2EQC4S7w=="
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
- SizeCompletedValid = "DIq1pQKwPSN4hvxoUBXGk6yOCDrLgM3Y7fZPT/IwntE1n4uLvcqN09CYEh2EQC4S7w=="
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders
- RecordModifiedMax = "DIq1pQKwPSN4hvxoUBXGk6yOCDrLgM3Y7fZPT/IwntE1n4uLvcqN09CYEh2EQC4S7w=="
- In HKEY_CURRENT_USER\Software\Microsoft\Notepad
- recordEnabledCheck = "5"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
- StyleModifiedPrev = "5"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders
- UrlEnabledUse = "5"
- In HKEY_CURRENT_USER\Software\Microsoft\Notepad
- platformCompressedValid = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
- InfoPlayedCurrent = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders
- FlagsModifiedValid = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Notepad
- dBSavedUse = "{random values}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Main
- Check_Associations = "no"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Main
- NoProtectedModeBanner = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
- Check_Associations = "no"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
- NoProtectedModeBanner = "1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Main
- IE8RunOnceCompletionTime = "{random values}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Main
- IE8RunOnceLastShown = "1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Main
- IE8RunOnceLastShown_TIMESTAMP = "{random values}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Main
- IE8RunOncePerInstallCompleted = "1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Main
- IE8TourShown = "1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Main
- IE8TourShownTime = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
- IE8RunOnceCompletionTime = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
- IE8RunOnceLastShown = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
- IE8RunOnceLastShown_TIMESTAMP = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
- IE8RunOncePerInstallCompleted = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
- IE8TourShown = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
- IE8TourShownTime = "{random values}"
Step 4
Search and delete these components
- %System Root%\tmp.exe
- %System%\Packet.dll
- %System%\wpcap.dll
- %System%\drivers\npf.sys
Step 5
Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_KELIHOS.ALG. 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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