WORM_HELLPWN.SMD
Trojan:Win32/Malex.gen!E (Microsoft); W32/Autorun.worm.h (McAfee); W32.SillyFDC (Symantec); Worm.Win32.Agent.vw (Kaspersky); BehavesLike.Win32.Malware.tsc (mx-v) (Sunbelt); Worm.Generic.332334 (FSecure)
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
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%\g34607\winlogon.exe
- %System%\2F855XR\smss.exe
- %Windows%\g34607spawn.cmd
- %System%\dhJ3C7543.exe
- %System%\zF855XRa.exe
- %Windows%\g34607\service.exe
- %System%\2F855XR\lsass.exe
(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.. %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)
It creates the following folders:
- %Windows%\g34607
- %System%\2F855XR
(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.. %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)
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
8g34607zi = "%Windows%\g34607spawn.cmd"
It modifies the following registry entries to ensure it automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
Shell = "explorer.exe, %System%\zF855XRa.exe"
(Note: The default value data of the said registry entry is Explorer.exe.)
Other System Modifications
This worm adds the following registry keys:
HKEY_LOCAL_MACHINE\Software\Microsoft\
SYSTEM\LGHT
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
SYSTEM\LGHT
RND1 = "g34607"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
SYSTEM\LGHT
RND2 = "F855XR"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
SYSTEM\LGHT
RND3 = "hJ3C75"
Dropping Routine
This worm drops the following files:
- %User Profile%\My Documents\about.html
- %User Startup%\msdos.cmd
- %Windows%\g34607\winlogon.exe
- %System%\2F855XR\smss.exe
- %Windows%\g34607spawn.cmd
- %System%\dhJ3C7543.exe
- %System%\zF855XRa.exe
- %Windows%\g34607\service.exe
- %System%\2F855XR\lsass.exe
(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.. %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.. %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.. %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)
This report is generated via an automated analysis system.
SOLUTION
Step 1
For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.
Step 2
Identify and delete files detected as WORM_HELLPWN.SMD using either the Startup Disk or Recovery Console
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\SYSTEM
- LGHT
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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- 8g34607zi="%Windows%\g34607spawn.cmd"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\SYSTEM\LGHT
- RND1="g34607"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\SYSTEM\LGHT
- RND2="F855XR"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\SYSTEM\LGHT
- RND3="hJ3C75"
Step 5
Restore this modified 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 NT\CurrentVersion\Winlogon
- From: Shell="explorer.exe, %System%\zF855XRa.exe"
To: Shell=Explorer.exe
- From: Shell="explorer.exe, %System%\zF855XRa.exe"
Step 6
Search and delete these folders
- %Windows%\g34607
- %System%\2F855XR
Step 7
Search and delete these files
- %User Profile%\My Documents\about.html
- %User Startup%\msdos.cmd
- %Windows%\g34607\winlogon.exe
- %System%\2F855XR\smss.exe
- %Windows%\g34607spawn.cmd
- %System%\dhJ3C7543.exe
- %System%\zF855XRa.exe
- %Windows%\g34607\service.exe
- %System%\2F855XR\lsass.exe
Step 8
Scan your computer with your Trend Micro product to delete files detected as WORM_HELLPWN.SMD. 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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