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WORM_PATCH.A

October 08, 2012
 Analysis by: Christopher Daniel So
 Modified by: Roland Marco Dela Paz
 PLATFORM:

Windows 2000, XP, Server 2003

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

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW


This worm 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:

335,872 bytes

File Type:

PE

File Compression:

UPX

Memory Resident:

No

Initial Samples Received Date:

28 Jul 2010

Installation

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

  • %Windows%\MSGM.DLL

(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)

File Infection

This worm infects the following file types:

  • .EXE - infected files are detected as PE_PATCHED.III

Propagation

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

  • {Drive}:\Pagef1le.sys

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=rundll32.exe Pagefi1e.sys,RunDll
shell\\´ò¿ª(&0)\\command=rundll32.exe Pagefi1e.sys,RunDll
shell=´ò¿ª(&0)

  SOLUTION

Minimum Scan Engine:

8.900

VSAPI OPR PATTERN File:

7.364.12

VSAPI OPR PATTERN Date:

06 Aug 2010

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

Remove malware files dropped/downloaded by WORM_PATCH.A

Step 3

Scan your computer with your Trend Micro product and note files detected as WORM_PATCH.A

Step 4

Restart in Safe Mode

[ Learn More ]

Step 5

Search and delete AUTORUN.INF files created by WORM_PATCH.A that contain these strings

[ Learn More ]
[autorun]
OPEN=rundll32.exe Pagefi1e.sys,RunDll
shell\\´ò¿ª(&0)\\command=rundll32.exe Pagefi1e.sys,RunDll
shell=´ò¿ª(&0)

Step 6

Search and delete the file detected as WORM_PATCH.A

[ 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 7

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