WORM_AUTORUN.ASM
Symantec: W32.SillyFDC; Microsoft: Worm:Win32/Orbina!rts; Kaspersky: Worm.Win32.AutoRun.avjm
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Worm
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
Copies itself in all available physical drives, Propagates via removable drives
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.
However, as of this writing, the said sites are inaccessible.
TECHNICAL DETAILS
212,992 bytes
EXE
Yes
15 Aug 2008
Connects to URLs/Ips
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%\{Malware File Name}.exe
(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)
It drops the following non-malicious file:
- %Windows%\delautorun.ini
(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)
It adds the following mutexes to ensure that only one of its copies runs at any one time:
- DELAUTORUN
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
DelAutorun = "%Windows%\{Malware File Name}.exe"
Propagation
This worm creates the following folder in all physical and removable drives:
- Autorun.inf
Other Details
This worm connects to the following possibly malicious URL:
- http://{BLOCKED}yes.scu.edu.cn
However, as of this writing, the said sites are inaccessible.
SOLUTION
8.900
5.480.02
15 Aug 2008
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
Terminate a process file/s detected as WORM_AUTORUN.ASM
*Note: If the detected file/s is/are not displayed in theWindows Task Manager, continue doing the next steps.
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
- DelAutorun = "%Windows%\{Malware File Name}.exe"
- DelAutorun = "%Windows%\{Malware File Name}.exe"
Step 4
Search and delete this file
Step 5
Search and delete this folder
Step 6
Scan your computer with your Trend Micro product to delete files detected as WORM_AUTORUN.ASM. 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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