Description: 

To get a one-glance comprehensive view of the behavior of this malware, refer to the Behavior Diagram shown below.

Malware Overview

This worm may arrive via removable drives. It also propagates via removable drives. It drops an AUTORUN.INF file to automatically execute dropped copies when the drives are accessed.

It drops a file which is detected as TSPY_OLGAME.MS. It also downloads .RAR archives, contents of which are extracted to the affected system and detected as WORM_AUTORUN.BYT. It then executes the extracted file. As a result, malicious routines of the downloaded file may be exhibited on the affected system.

It modifies certain registry entries to hide files with both System and Read-only attributes.

Details:

Installation

This worm drops the following file(s):

• %System%\j3ewro.exe - copy of itself
• System%\JWEDSFDO0.DLL - also detected as WORM_ONLINEG.AFU
• %System%\revo.exe copy of itself
• %System%\revo0.dll detected as TSPY_OLGAME.MS

(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.)

Autostart Technique

This worm creates the following registry entry(ies) to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\Windows
CurrentVersion\Run
jvsoft = "%System%\j3ewro.exe"
revo = "%System%\revo.exe"

(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.)

Other System Modifications

It modifies the following registry entry(ies) to hide files with both System and Read-only attributes:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\Advanced
Hidden = "2"

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

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

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\
CurrentVersion\Explorer\Advanced\Folder\Hidden\SHOWALL
CheckedValue = "0"

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

Propagation via Removable Drives

This worm drops copies of itself in all removable drives.

It drops an AUTORUN.INF file to automatically execute dropped copies when the drives are accessed.

The file AUTORUN.INF contains the following strings:

;{Garbage}
[AutoRun]
;{Garbage}
open=tj8odymw.exe
;{Garbage}
shell\open\Command=tj8odymw.exe
;{Garbage}
shell\open\Default=1
;{Garbage}
shell\explore\Command=tj8odymw.exe
;{Garbage}

;{ Garbage}
[AutoRun]
;{ Garbage}
open=t2yev.exe
;{ Garbage}
shell\ open\ Command= t2yev.exe
;{ Garbage}
shell\ open\ Default=1
;{ Garbage}
shell\ explore\ Command=t2yev.exe
;{ Garbage}

Download Routine

This worm accesses the following URLs to download the following .RAR files:

• http:// {BLOCKED}9.com/xjj/cc1.rar
• http:// {BLOCKED}7.com/xjj/cc.rar
• http://{BLOCKED}3.com/xrbv/uu1.rar
• http://{BLOCKED}3.com/xrbv/uu.rar

It then extracts the downloaded .RAR files which is detected as WORM_AUTORUN.BYT. It then executes the extracted file. As a result, malicious routines of the downloaded file may be exhibited on the affected system.

Affected Platforms

This worm runs on Windows 98, ME, NT, 2000, XP, and Server 2003.

Analysis By: Jasper Manuel

Revision History:

Important note: The "Minimum scan engine" refers to the earliest Trend Micro scan engine version guaranteed to detect this threat. However, Trend Micro strongly recommends that you update to the latest version in order to get comprehensive protection. Download the latest scan engine here.

Solution:

Note: To fully remove all associated malware, perform the clean solutions for the following:

• TSPY_OLGAME.MS
• WORM_AUTORUN.BYT

Important Windows ME/XP Cleaning Instructions

Users running Windows ME and XP must disable System Restore to allow full scanning of infected computers.

Users running other Windows versions can proceed with the succeeding solution set(s).

Restarting in Safe Mode

This malware has characteristics that require the computer to be restarted in safe mode. Go to this page for instructions on how to restart your computer in safe mode.

Removing Autostart Entries from the Registry

This solution deletes/modifies registry keys/entries added/modified by this malware. Before performing the steps below, make sure you know how to back up the registry and how to restore it if a problem occurs. Refer to this Microsoft article for more information about modifying your computer's registry.

1. Open Registry Editor. Click Start>Run, type REGEDIT, then press Enter.
2. In the left panel, double-click the following:
   HKEY_CURRENT_USER>Software>Microsoft>Windows>CurrentVersion>
   Run
   
3. In the right panel, locate and delete the entries:
   jvsoft = "%System%\j3ewro.exe"
   revo = "%System%\revo.exe"
   (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.)

Restoring Registry Entries

1. Still in Registry Editor, in the left panel, double-click the following:
   HKEY_CURRENT_USER>Software>Microsoft>Windows>CurrentVersion>
   Explorer>Advanced
   
2. In the right panel, locate the entry:
   Hidden = "2"
   
3. Right-click on the value name and choose Modify. Change the value data of this entry to:
   "1"
4. In the right panel, locate the entry:
   ShowSuperHidden = "0"
   
5. Right-click on the value name and choose Modify. Change the value data of this entry to:
   "1"
6. In the left panel, double-click the following:
   HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows>CurrentVersion>
   Explorer>Advanced>Folder>Hidden>SHOWALL
   
7. In the right panel, locate the entry:
   CheckedValue = "0"
   
8. Right-click on the value name and choose Modify. Change the value data of this entry to:
   "1"
9. Close Registry Editor.

Deleting Malware-created AUTORUN.INF/s

1. Right-click Start then click Search... or Find..., depending on the version of Windows you are running.
2. In the Named input box, type:
   AUTORUN.INF
3. In the Look In drop-down list, select a drive, then press Enter.
4. Select the file, then open using Notepad.
5. Check if the following lines are present in the file:
   ;{Garbage}
   [AutoRun]
   ;{Garbage}
   open=tj8odymw.exe
   ;{Garbage}
   shell\open\Command=tj8odymw.exe
   ;{Garbage}
   shell\open\Default=1
   ;{Garbage}
   shell\explore\Command=tj8odymw.exe
   ;{Garbage}
   or ;{ Garbage}
   [AutoRun]
   ;{ Garbage}
   open=t2yev.exe
   ;{ Garbage}
   shell\ open\ Command= t2yev.exe
   ;{ Garbage}
   shell\ open\ Default=1
   ;{ Garbage}
   shell\ explore\ Command=t2yev.exe
   ;{ Garbage}
   
6. If the lines are present, delete the file.
7. Repeat steps 3 to 6 for AUTORUN.INF files in the remaining removable drives.
8. Close Search Results.

Running Trend Micro Antivirus

If you are currently running in safe mode, please restart your computer normally before performing the following solution.

Scan your computer with Trend Micro antivirus and delete files detected as WORM_ONLINEG.AFU. To do this, Trend Micro customers must download the latest virus pattern file and scan their computer. Other Internet users can use HouseCall, the Trend Micro online virus scanner.

Trend Micro offers best-of-breed antivirus and content-security solutions for your corporate network, small and medium business, mobile device or home PC.