WORM_FUJACK.DU
Virus:Win32/Viking.MV (Microsoft); W32.Fujacks.B (Symantec); Worm.Win32.Fujack.db (Kaspersky); Trojan.Generic.3737711 (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:
- %Program Files%\Adobe\Reader 10.0\Reader\AcroRd32.exe
- %Program Files%\Adobe\Reader 10.0\Reader\AdobeCollabSync.exe
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)
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
svcshare = "%System%\drivers\spoclsv.exe"
Other System Modifications
This worm modifies the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced\Folder\Hidden\
SHOWALL
CheckedValue = "0"
(Note: The default value data of the said registry entry is 1.)
Dropping Routine
This worm drops the following files:
- %User Temp%\40$$.Ico
- %Program Files%\Desktop_.ini
- %Program Files%\Adobe\Desktop_.ini
- %Program Files%\Adobe\Reader 10.0\Desktop_.ini
- %Program Files%\Adobe\Reader 10.0\Esl\Desktop_.ini
- %Program Files%\Adobe\Reader 10.0\Reader\Desktop_.ini
- %User Temp%\30$$.Ico
- %User Temp%\62$$.Ico
- %User Temp%\75$$.Ico
- %User Temp%\28$$.Ico
- %User Temp%\27$$.Ico
- %Program Files%\Adobe\Reader 10.0\Reader\AIR\Desktop_.ini
- %Program Files%\Adobe\Reader 10.0\Reader\Browser\Desktop_.ini
- %User Temp%\7$$.Ico
(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.. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)
Other Details
This worm connects to the following possibly malicious URL:
- http://www.{BLOCKED}y.net/update/wormcn.txt
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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- svcshare = "%System%\drivers\spoclsv.exe"
Step 4
Restore these modified registry values
Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folder\Hidden\SHOWALL
- From: CheckedValue = "0"
To: CheckedValue = ""1""
- From: CheckedValue = "0"
Step 5
Search and delete these components
- %User Temp%\40.Ico
- %Program Files%\Desktop_.ini
- %Program Files%\Adobe\Desktop_.ini
- %Program Files%\Adobe\Reader 10.0\Desktop_.ini
- %Program Files%\Adobe\Reader 10.0\Esl\Desktop_.ini
- %Program Files%\Adobe\Reader 10.0\Reader\Desktop_.ini
- %User Temp%\30.Ico
- %User Temp%\62.Ico
- %User Temp%\75.Ico
- %User Temp%\28.Ico
- %User Temp%\27.Ico
- %Program Files%\Adobe\Reader 10.0\Reader\AIR\Desktop_.ini
- %Program Files%\Adobe\Reader 10.0\Reader\Browser\Desktop_.ini
- %User Temp%\7.Ico
• For Windows Vista and Windows 7 users:
- Click Start>Computer.
- In the Search input box, type:
- %User Temp%\40.Ico
- %Program Files%\Desktop_.ini
- %Program Files%\Adobe\Desktop_.ini
- %Program Files%\Adobe\Reader 10.0\Desktop_.ini
- %Program Files%\Adobe\Reader 10.0\Esl\Desktop_.ini
- %Program Files%\Adobe\Reader 10.0\Reader\Desktop_.ini
- %User Temp%\30.Ico
- %User Temp%\62.Ico
- %User Temp%\75.Ico
- %User Temp%\28.Ico
- %User Temp%\27.Ico
- %Program Files%\Adobe\Reader 10.0\Reader\AIR\Desktop_.ini
- %Program Files%\Adobe\Reader 10.0\Reader\Browser\Desktop_.ini
- %User Temp%\7.Ico
- Once located, select the file then press SHIFT+DELETE to delete it.
- Repeat the said steps for all files listed.
*Note: Read the following Microsoft page if these steps do not work on Windows 7.
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_FUJACK.DU. 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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