Analysis by: Jennifer Gumban
 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 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.

  TECHNICAL DETAILS

File Size: 1,885,559 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 08 Apr 2009

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.

Other System Modifications

This worm adds the following registry entries:

HKEY_CURRENT_USER\Control Panel\Desktop
SCRNSAVE.EXE = "%System%\{file name}.scr"

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
NoDriveTypeAutoRun = "91"

HKEY_USERS\{SID}\Software\
Microsoft\Internet Explorer\Main
Start page = "http://nttceng.intra/login.jsp?url=%2Ftop%2Findex.html%2Findex.jsp%3F"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\RemoteRegistry
Start = "3"

Dropping Routine

This worm drops the following files:

  • %System%\{file name}.scr

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

Other Details

This worm connects to the following possibly malicious URL:

  • http://{BLOCKED}g.intra/login.jsp?url=%2Ftop%2Findex.html%2Findex.jsp%3F

  SOLUTION

Minimum Scan Engine: 9.750
VSAPI OPR PATTERN File: 5.883.00
VSAPI OPR PATTERN Date: 08 Apr 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

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Remove the malware/grayware file dropped/downloaded by WORM_AUTORUN.JAO. (Note: Please skip this step if the threat(s) listed below have already been removed.)

     
    • "%System%\{file name}.scr"

Step 4

Delete this 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_USERS\{SID}\Software\Microsoft\Internet Explorer\Main
    • Start page = "http://nttceng.intra/login.jsp?url=%2Ftop%2Findex.html%2Findex.jsp%3F"
  • In HKEY_CURRENT_USER\Control Panel\Desktop
    • SCRNSAVE.EXE = "%System%\{file name}.scr"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
    • ShowSuperHidden = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
    • NoDriveTypeAutoRun = "91"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\RemoteRegistry
    • Start = "3"

Step 5

Scan your computer with your Trend Micro product to delete files detected as WORM_AUTORUN.JAO. 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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