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WORM_AUTORUN.JJO

September 07, 2013
 Analysis by: Rika Joi Gregorio
 ALIASES:

Worm:Win32/Orbina!rts(Microsoft), W32/Autorun.worm!hf(McAfee), Worm.Win32.AutoRun(Ikarus), Win32/TrojanDropper.Agent.NLV trojan(Eset)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

 OVERALL RISK RATING:
 REPORTED INFECTION:
 SYSTEM IMPACT RATING:
 INFORMATION EXPOSURE:

  • 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 drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.

  TECHNICAL DETAILS

File Size:

62,984 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

24 May 2013

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 files:

  • {Drive Letter}:\autorun.inf
  • {Drive Letter}:\RECYCLER\desktop.ini
  • %User Temp%\L4SD\B13A4DC0.db
  • %User Temp%\~RHF5141.log

(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.)

It drops and executes the following files:

  • %User Temp%\conime.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, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

It drops the following copies of itself into the affected system:

  • %System%\wmiprvse.exe

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)

It creates the following folders:

  • %User Temp%\L4SD

(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.)

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\Policies\
Explorer\Run
winmgmt = "%System%\wmiprvse.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\Run
winmgmt = "%System%\wmiprvse.exe"

Other System Modifications

This worm adds the following registry keys:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\Run

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\Run

It modifies the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
ShowSuperHidden = "0"

(Note: The default value data of the said registry entry is 1.)

Propagation

This worm creates the following folders in all removable drives:

  • {Drive Letter}:\RECYCLER

It drops the following copy(ies) of itself in all removable drives:

  • {Drive Letter}:\RECYCLER\desktop.exe

It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.

The said .INF file contains the following strings:

;{garbage codes}
[autorun]
;{garbage codes}
shellexecute=RECYCLER\desktop.exe
;{garbage codes}
shell\Open\Command=RECYCLER\desktop.exe
;{garbage codes}
shell\Open\Explore=RECYCLER\desktop.exe
;{garbage codes}
Action=Open folder to view files
;{garbage codes}

  SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

6.402.02

FIRST VSAPI PATTERN DATE:

28 Aug 2009

VSAPI OPR PATTERN File:

6.403.00

VSAPI OPR PATTERN Date:

30 Aug 2009

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

[ Learn More ]

Step 3

Delete this registry key

[ Learn More ]

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\Explorer
    • Run
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies
    • Explorer

Step 4

Restore this modified registry value

[ Learn More ]

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\Explorer\Advanced
    • From: ShowSuperHidden = "0"
      To: ShowSuperHidden = "1"

Step 5

Search and delete these folders

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %User Temp%\L4SD
  • {Drive Letter}:\RECYCLER\

Step 6

Search and delete these files

[ Learn More ]
There may be some component files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden files and folders in the search result.
  • {Drive Letter}:\autorun.inf
  • {Drive Letter}:\RECYCLER\desktop.ini
  • %User Temp%\L4SD\B13A4DC0.db
  • %User Temp%\~RHF5141.log

Step 7

Search and delete AUTORUN.INF files created by WORM_AUTORUN.JJO that contain these strings

[ Learn More ]


;{garbage codes}
[autorun]
;{garbage codes}
shellexecute=RECYCLER\desktop.exe
;{garbage codes}
shell\Open\Command=RECYCLER\desktop.exe
;{garbage codes}
shell\Open\Explore=RECYCLER\desktop.exe
;{garbage codes}
Action=Open folder to view files
;{garbage codes}

Step 8

Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_AUTORUN.JJO. 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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