WORM_STUXNET.AA
TrojanDropper:Win32/Stuxnet.A (Microsoft); Worm.Win32.Stuxnet.m (Kaspersky); Win32.Worm.Stuxnet.A (FSecure); W32/Stuxnet.A!tr (Fortinet); Trojan.Win32.Chifrax (Ikarus); Win32/Stuxnet.A worm (Nod32);
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Worm
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
This worm arrives via removable drives. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.
TECHNICAL DETAILS
Arrival Details
This worm arrives via removable drives.
It 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 component file(s):
- %System%\drivers\mrxcls.sys
- %System%\drivers\mrxnet.sys
(Note: %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 drops the following non-malicious files:
- %Windows%\inf\mdmcpq3.PNF
- %Windows%\inf\mdmeric3.PNF
- %Windows%\inf\oem6C.PNF
- %Windows%\inf\oem7A.PNF
(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)
Dropping Routine
This worm drops the following files:
- %User Temp%\malware.exe
(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.)
It executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.
Other Details
This worm connects to the following URL(s) to check for an Internet connection:
- www.windowsupdate.com
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
Search and delete this file
Step 4
Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_STUXNET.AA. 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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