WORM_AUTORUN.CWZ
Worm:Win32/Autorun.CS (Microsoft); W32/Autorun.worm.h (McAfee); Trojan Horse (Symantec); Worm.Win32.AutoRun.dhz, Worm.Win32.AutoRun.dhz (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan:W32/Agent.EUM (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.
It disables Task Manager, Registry Editor, and Folder Options.
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 creates the following folders:
- %Windows%\winsys
(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
SunJavaUp = "%System%\JavaMachine.exe"
Other System Modifications
This worm adds the following registry keys:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
System
It creates the following registry entry(ies) to disable Task Manager, Registry Tools and Folder Options:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
System
DisableTaskmgr = "1"
Dropping Routine
This worm drops the following files:
- %Windows%\winsys\ELTPLXUN.exe
- %Windows%\winsys\EXKDGXXA.exe
- %Windows%\winsys\TVBNMITV.exe
- %Windows%\winsys\UXJHOHSG.exe
- %Windows%\winsys\KVARVROC.exe
- %Windows%\winsys\HEUKQUVQ.sys
- %Windows%\winsys\WCMUWFRM.sys
- %Windows%\winsys\MADFEPNI.sys
- %Windows%\winsys\CWTPKBJE.sys
- %Windows%\winsys\RUKAQLFA.sys
- %Windows%\winsys\UNKBBHXI.sys
- %Windows%\winsys\KLBLHRTE.sys
- %Windows%\winsys\AJSVOCPA.sys
- %Windows%\winsys\PHJGUMLV.sys
- %Windows%\winsys\MOFYPQTK.sys
- %Windows%\winsys\BMVJWBPG.jpg
- %Windows%\winsys\QKMTDLLC.jpg
- %Windows%\winsys\GIDEJVGX.jpg
- %Windows%\winsys\VGUOPGCT.jpg
- %Windows%\winsys\XIDGYMET.jpg
- %Windows%\winsys\NGTQFWAP.jpg
- %Windows%\winsys\KOPJBAHE.jpg
- %Windows%\winsys\ALGTHKDA.jpg
- %Windows%\winsys\VTBMCOLO.jpg
- %Windows%\winsys\LRSWJYHK.jpg
- %Windows%\winsys\BPJHPJDG.jpg
- %Windows%\winsys\QNARVTYC.jpg
- %Windows%\winsys\GKQCCEUX.jpg
- %Windows%\winsys\DSMUXHCM.dll
- %Windows%\winsys\SQDFERXI.dll
- %Windows%\winsys\NIHQRXKA.dll
- %Windows%\winsys\DGXBYIGV.dll
- %Windows%\winsys\REOLFSCR.dll
- %Windows%\winsys\OMKEAVJG.dll
- %Windows%\winsys\EKBOHGFC.dll
- %Windows%\winsys\THRYNQBX.dll
(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
Enable Registry Editor, Task Manager, and Folder options
Step 4
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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies
- System
Step 5
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
- SunJavaUp = "%System%\JavaMachine.exe"
Step 6
Search and delete these files
- %Windows%\winsys\ELTPLXUN.exe
- %Windows%\winsys\EXKDGXXA.exe
- %Windows%\winsys\TVBNMITV.exe
- %Windows%\winsys\UXJHOHSG.exe
- %Windows%\winsys\KVARVROC.exe
- %Windows%\winsys\HEUKQUVQ.sys
- %Windows%\winsys\WCMUWFRM.sys
- %Windows%\winsys\MADFEPNI.sys
- %Windows%\winsys\CWTPKBJE.sys
- %Windows%\winsys\RUKAQLFA.sys
- %Windows%\winsys\UNKBBHXI.sys
- %Windows%\winsys\KLBLHRTE.sys
- %Windows%\winsys\AJSVOCPA.sys
- %Windows%\winsys\PHJGUMLV.sys
- %Windows%\winsys\MOFYPQTK.sys
- %Windows%\winsys\BMVJWBPG.jpg
- %Windows%\winsys\QKMTDLLC.jpg
- %Windows%\winsys\GIDEJVGX.jpg
- %Windows%\winsys\VGUOPGCT.jpg
- %Windows%\winsys\XIDGYMET.jpg
- %Windows%\winsys\NGTQFWAP.jpg
- %Windows%\winsys\KOPJBAHE.jpg
- %Windows%\winsys\ALGTHKDA.jpg
- %Windows%\winsys\VTBMCOLO.jpg
- %Windows%\winsys\LRSWJYHK.jpg
- %Windows%\winsys\BPJHPJDG.jpg
- %Windows%\winsys\QNARVTYC.jpg
- %Windows%\winsys\GKQCCEUX.jpg
- %Windows%\winsys\DSMUXHCM.dll
- %Windows%\winsys\SQDFERXI.dll
- %Windows%\winsys\NIHQRXKA.dll
- %Windows%\winsys\DGXBYIGV.dll
- %Windows%\winsys\REOLFSCR.dll
- %Windows%\winsys\OMKEAVJG.dll
- %Windows%\winsys\EKBOHGFC.dll
- %Windows%\winsys\THRYNQBX.dll
Step 7
Search and delete this folder
- %Windows%\winsys
Step 8
Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_AUTORUN.CWZ. 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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