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WORM_NEWTEMP.RUI

October 09, 2012
 Analysis by: Cris Nowell Pantanilla
 Modified by: Mark Joseph Manahan
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Propagates via removable drives


This worm arrives via removable drives.

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

As of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size:

Varies

File Type:

DLL, EXE

Memory Resident:

Yes

Initial Samples Received Date:

07 Apr 2009

Payload:

Downloads files, Connects to URLs/IPs

Arrival Details

This worm arrives via removable drives.

Installation

This worm drops the following copies of itself into the affected system:

  • %Program Files%\Internet Explorer\PLUGINS\NewTemp.bak

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.)

Other System Modifications

This worm adds the following registry keys as part of its installation routine:

HKEY_CLASSES_ROOT\CLSID\{0EA66AD2-CF26-2E23-532B-B292E22F3266}

Propagation

This worm drops the following copy of itself in all physical and removable drives:

  • [Drive]:\PegeFile.pif

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:

[autorun]
open=PegeFile.pif
shellexecute=PegeFile.pif
shell\Auto\command=PegeFile.pif
shell=Auto

Dropping Routine

This worm drops the following files:

  • %Program Files%\Internet Explorer\PLUGINS\NewTemp.dll - WORM_NEWTEMP.RUI

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.)

Download Routine

This worm accesses the following websites to download files:

  • http://www.{BLOCKED}2.cn/sysdown.txt

As of this writing, the said sites are inaccessible.

  SOLUTION

Minimum Scan Engine:

9.200

VSAPI OPR PATTERN File:

5.883.00

VSAPI OPR PATTERN Date:

07 Apr 2009

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

Scan your computer with your Trend Micro product and note files detected as WORM_NEWTEMP.RUI

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

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. Before you could do this, you must restart in Safe Mode. For instructions on how to do this, you may refer to this page If the preceding step requires you to restart in safe mode, you may proceed to edit the system registry.

  • In HKEY_CLASSES_ROOT\CLSID\{0EA66AD2-CF26-2E23-532B-B292E22F3266}

Step 5

Search and delete the file detected as WORM_NEWTEMP.RUI

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden files in the search result.

Step 6

Search and delete AUTORUN.INF files created by WORM_NEWTEMP.RUI that contain these strings

[ Learn More ]

[autorun]
open=PegeFile.pif
shellexecute=PegeFile.pif
shell\Auto\command=PegeFile.pif
shell=Auto

Step 7

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