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WORM_AUTORUN.BFW

May 10, 2013
 ALIASES:

Worm:Win32/Otwycal.gen!A (Microsoft); W32/Autorun.worm.gen (McAfee); W32.SillyDC (Symantec); PAK:PE_Patch, PAK:UPack, Worm.Win32.Otwycal.q (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Worm.Generic.30429 (FSecure)

 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

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:

9,032 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

12 Nov 2012

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 deletes the following files:

  • %Windows%\Tasks\0x01xx8p.exe

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

It adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Data\
Config

Dropping Routine

This worm drops the following files:

  • %Windows%\Tasks\spoolsv.ext
  • %System%\dllcache\spoolsv.exe
  • %System%\spoolsv.exe

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

Other Details

This worm connects to the following possibly malicious URL:

  • http://444.{BLOCKED}8.com/config.txt

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.300

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

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_LOCAL_MACHINE\SOFTWARE\Data
    • Config

Step 3

Search and delete these components

[ Learn More ]
There may be some components 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.
  • %Windows%\Tasks\spoolsv.ext
  • %System%\dllcache\spoolsv.exe
  • %System%\spoolsv.exe

Step 4

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

Step 5

Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.

  • %Windows%\Tasks\0x01xx8p.exe


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