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WORM_AUTORUN.HIN

October 09, 2012
 Analysis by: Sabrina Lei Sioting
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW


This worm arrives by connecting affected removable drives to a system. It 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:

700,416 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

27 Apr 2012

Arrival Details

This worm arrives by connecting affected removable drives to a system.

It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

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

  • %Windows%\slass.exe

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

Autostart Technique

This worm adds the following registry entries to enable its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
slass.exe = "%Windows%\slass.exe"

Other System Modifications

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

HKEY_CLASSES_ROOT\Drive\shell\
Kiss My Ass\command
{default} = "%Windows%\slass.exe m"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Drive\shell\Kiss My Ass\
command
{default} = "%Windows%\slass.exe m"

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

HKEY_CLASSES_ROOT\Drive\shell\
Kiss My Ass

HKEY_CLASSES_ROOT\Drive\shell\
Kiss My Ass\command

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Drive\shell\Kiss My Ass

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Drive\shell\Kiss My Ass\
command

Propagation

This worm drops the following copy(ies) of itself in all removable drives:

  • Indian Songs.exe
  • Movies.exe

HOSTS File Modification

This worm overwrites the system's HOSTS files to prevent users from accessing the following websites:

  • isohunt.com
  • www.isohunt.com
  • fenopy.com
  • www.fenopy.com
  • gpirate.com
  • www.gpirate.com
  • torrentzap.com
  • www.torrentzap.com
  • btscene.com
  • www.btscene.com
  • thepiratebay.org
  • www.thepiratebay.org
  • youtorrent.com
  • www.youtorrent.com
  • meganova.org
  • www.meganova.org
  • cinematorrents.com
  • www.cinematorrents.com
  • bitunity.org
  • www.bitunity.org
  • extratorrent.com
  • www.extratorrent.com
  • torrentroot.com
  • www.torrentroot.com
  • demonoid.com
  • www.demonoid.com
  • nowtorrents.com
  • www.nowtorrents.com
  • bitsoup.org
  • www.bitsoup.org
  • kickasstorrents.com

  SOLUTION

Minimum Scan Engine:

9.200

VSAPI OPR PATTERN File:

8.947.00

VSAPI OPR PATTERN Date:

28 Apr 2012

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

Identify and terminate files detected as WORM_AUTORUN.HIN

[ Learn More ]
  1. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  2. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 3

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\Drive\shell
    • Kiss My Ass
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Drive\shell
    • Kiss My Ass

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_CLASSES_ROOT\Drive\shell\Kiss My Ass\command
    • {default} = "%Windows%\slass.exe m"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Drive\shell\Kiss My Ass\command
    • {default} = "%Windows%\slass.exe m"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • slass.exe = "%Windows%\slass.exe"

Step 5

Remove these strings added by the malware/grayware/spyware in the HOSTS file

[ Learn More ]
    • {BLOCKED}.{BLOCKED}.142.170 isohunt.com
    • {BLOCKED}.{BLOCKED}.142.170 www.isohunt.com
    • {BLOCKED}.{BLOCKED}.142.170 fenopy.com
    • {BLOCKED}.{BLOCKED}.142.170 www.fenopy.com
    • {BLOCKED}.{BLOCKED}.142.170 gpirate.com
    • {BLOCKED}.{BLOCKED}.142.170 www.gpirate.com
    • {BLOCKED}.{BLOCKED}.142.170 torrentzap.com
    • {BLOCKED}.{BLOCKED}.142.170 www.torrentzap.com
    • {BLOCKED}.{BLOCKED}.142.170 btscene.com
    • {BLOCKED}.{BLOCKED}.142.170 www.btscene.com
    • {BLOCKED}.{BLOCKED}.142.170 thepiratebay.org
    • {BLOCKED}.{BLOCKED}.142.170 www.thepiratebay.org
    • {BLOCKED}.{BLOCKED}.142.170 youtorrent.com
    • {BLOCKED}.{BLOCKED}.142.170 www.youtorrent.com
    • {BLOCKED}.{BLOCKED}.142.170 meganova.org
    • {BLOCKED}.{BLOCKED}.142.170 www.meganova.org
    • {BLOCKED}.{BLOCKED}.142.170 cinematorrents.com
    • {BLOCKED}.{BLOCKED}.142.170 www.cinematorrents.com
    • {BLOCKED}.{BLOCKED}.142.170 bitunity.org
    • {BLOCKED}.{BLOCKED}.142.170 www.bitunity.org
    • {BLOCKED}.{BLOCKED}.142.170 extratorrent.com
    • {BLOCKED}.{BLOCKED}.142.170 www.extratorrent.com
    • {BLOCKED}.{BLOCKED}.142.170 torrentroot.com
    • {BLOCKED}.{BLOCKED}.142.170 www.torrentroot.com
    • {BLOCKED}.{BLOCKED}.142.170 demonoid.com
    • {BLOCKED}.{BLOCKED}.142.170 www.demonoid.com
    • {BLOCKED}.{BLOCKED}.142.170 nowtorrents.com
    • {BLOCKED}.{BLOCKED}.142.170 www.nowtorrents.com
    • {BLOCKED}.{BLOCKED}.142.170 bitsoup.org
    • {BLOCKED}.{BLOCKED}.142.170 www.bitsoup.org
    • {BLOCKED}.{BLOCKED}.142.170 kickasstorrents.com
"

Step 6

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