WORM_AUTORUN.HGE
Worm:Win32/Autorun.LD (Microsoft); [.au3]:W32/Autorun.worm.bz.gen (McAfee); W32.SillyFDC (Symantec); PAK:UPX, ARC:Embedded, [script.au3]:Worm.Win32.AutoIt.ci (Kaspersky); Trojan.Win32.AutoIt.gen.2 (v) (Sunbelt); Win32.Worm.AutoIt.CL (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:
- %System Root%\RECYCLER\explorer.exe
- %Program Files%\{17350501621331}.exe
- %Program Files%\explorer.exe
- %System Root%\explorer.exe
- %Windows%\BackUp\explorer.exe
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %Program Files% is the default Program Files folder, usually C:\Program Files.. %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)
It creates the following folders:
- %Windows%\BackUp
(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)
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
explorer = "%Windows%\BackUp\explorer.exe"
Other System Modifications
This worm deletes the following files:
- %Program Files%\{17350501621331}.exe
- %Program Files%\explorer.exe
- %System Root%\explorer.exe
- %Windows%\BackUp\explorer.exe
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion
{17350501621331} = "%System Root%\explorer.exe"
Dropping Routine
This worm drops the following files:
- %Windows%\BackUp\autorun.inf
(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)
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
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
- explorer = "%Windows%\BackUp\explorer.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion
- {17350501621331} = "%System Root%\explorer.exe"
Step 4
Search and delete this file
- %Windows%\BackUp\autorun.inf
Step 5
Search and delete this folder
- %Windows%\BackUp
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_AUTORUN.HGE. 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 7
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.
- %Program Files%\{17350501621331}.exe
- %Program Files%\explorer.exe
- %System Root%\explorer.exe
- %Windows%\BackUp\explorer.exe
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