WORM_OTORUN.SMX
Worm:Win32/Rokhshah.A (Microsoft); W32/Autorun.worm !! (McAfee); W32.SillyFDC (Symantec); Worm.Win32.AutoRun.dry (Kaspersky); BehavesLike.Win32.Malware.eah (mx-v) (Sunbelt); Worm:W32/Rokshak.A (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
1,074,688 bytes
EXE
Yes
15 May 2012
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%\explorer.exe
- %System%\Service.exe
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)
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
Network Services = "%System%\Service.exe"
Other System Modifications
This worm deletes the following files:
- %Temp%\scs1.tmp
- %Temp%\scs2.tmp
(Note: %Temp% is the Windows Temporary folder, which is usually C:\Windows\Temp.)
It adds the following registry keys:
HKEY_LOCAL_MACHINE\Software\Service
HKEY_CURRENT_USER\Software\Service
Dropping Routine
This worm drops the following files:
- %System%\Service.exe
- %System%\tmp.exe
- %System%\autorun.inf
- %System Root%\autorun.exe
- %System Root%\autorun.inf
- %System%\explorer.exe
- f:\Shahrokh.exe
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
This report is generated via an automated analysis system.
SOLUTION
9.200
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 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_LOCAL_MACHINE\Software
- Service
- In HKEY_CURRENT_USER\Software
- Service
Step 4
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
- Network Services = "%System%\Service.exe"
Step 5
Search and delete these components
- %System%\Service.exe
- %System%\tmp.exe
- %System%\autorun.inf
- %System Root%\autorun.exe
- %System Root%\autorun.inf
- %System%\explorer.exe
- f:\Shahrokh.exe
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_OTORUN.SMX. 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.
- %Temp%\scs1.tmp
- %Temp%\scs2.tmp
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