WORM_SILLY.RUN

November 16, 2012
 ALIASES:

Worm:Win32/Autorun.GN (Microsoft); W32/Autorun.worm.h (McAfee); W32.SillyFDC (Symantec); PAK:UPX, Worm.Win32.AutoRun.rwq, Worm.Win32.AutoRun.rwq (Kaspersky); Worm.Win32.Autorun.jp (V) (Sunbelt); Worm.Generic.59949 (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.

It disables Task Manager, Registry Editor, and Folder Options.

  TECHNICAL DETAILS

File Size:

47,104 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

16 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.

Installation

This worm creates the following folders:

  • %User Profile%\tarantula

(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)

Other System Modifications

This worm adds the following registry keys:

HKEY_CURRENT_USER\SOFTWARE\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\Run

It creates the following registry entry(ies) to disable Task Manager, Registry Tools and Folder Options:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\Run
harodin = "%User Profile%\tarantula\smss.exe"

Dropping Routine

This worm drops the following files:

  • %User Profile%\tarantula\smss.exe
  • B:\autorun.inf
  • B:\Tarantula.exe
  • B:\Music.exe
  • %System Root%\autorun.inf
  • %System Root%\Tarantula.exe
  • %System Root%\Music.exe
  • D:\autorun.inf
  • D:\Tarantula.exe
  • D:\Music.exe
  • E:\autorun.inf
  • E:\Tarantula.exe
  • E:\Music.exe
  • F:\autorun.inf
  • F:\Tarantula.exe
  • F:\Music.exe
  • G:\autorun.inf
  • G:\Tarantula.exe
  • G:\Music.exe
  • H:\autorun.inf
  • H:\Tarantula.exe
  • H:\Music.exe
  • I:\autorun.inf
  • I:\Tarantula.exe
  • I:\Music.exe
  • J:\autorun.inf
  • J:\Tarantula.exe
  • J:\Music.exe
  • K:\autorun.inf
  • K:\Tarantula.exe
  • K:\Music.exe
  • L:\autorun.inf
  • L:\Tarantula.exe
  • L:\Music.exe
  • M:\autorun.inf
  • M:\Tarantula.exe
  • M:\Music.exe
  • N:\autorun.inf
  • N:\Tarantula.exe
  • N:\Music.exe
  • O:\autorun.inf
  • O:\Tarantula.exe
  • O:\Music.exe
  • P:\autorun.inf
  • P:\Tarantula.exe
  • P:\Music.exe
  • Q:\autorun.inf
  • Q:\Tarantula.exe
  • Q:\Music.exe
  • R:\autorun.inf
  • R:\Tarantula.exe
  • R:\Music.exe
  • S:\autorun.inf
  • S:\Tarantula.exe
  • S:\Music.exe
  • T:\autorun.inf
  • T:\Tarantula.exe
  • T:\Music.exe
  • U:\autorun.inf
  • U:\Tarantula.exe
  • U:\Music.exe
  • V:\autorun.inf
  • V:\Tarantula.exe
  • V:\Music.exe
  • W:\autorun.inf
  • W:\Tarantula.exe
  • W:\Music.exe
  • X:\autorun.inf
  • X:\Tarantula.exe
  • X:\Music.exe
  • Y:\autorun.inf
  • Y:\Tarantula.exe
  • Y:\Music.exe
  • Z:\autorun.inf
  • Z:\Tarantula.exe
  • Z:\Music.exe

(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.300

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

Enable Registry Editor, Task Manager, and Folder options

[ Learn More ]
By doing this step, you also enable other applications/programs disabled by this malware/grayware.

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.

  • In HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer
    • Run

Step 4

Search and delete these files

[ Learn More ]
There may be some component files 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.
  • %User Profile%\tarantula\smss.exe
  • B:\autorun.inf
  • B:\Tarantula.exe
  • B:\Music.exe
  • %System Root%\autorun.inf
  • %System Root%\Tarantula.exe
  • %System Root%\Music.exe
  • D:\autorun.inf
  • D:\Tarantula.exe
  • D:\Music.exe
  • E:\autorun.inf
  • E:\Tarantula.exe
  • E:\Music.exe
  • F:\autorun.inf
  • F:\Tarantula.exe
  • F:\Music.exe
  • G:\autorun.inf
  • G:\Tarantula.exe
  • G:\Music.exe
  • H:\autorun.inf
  • H:\Tarantula.exe
  • H:\Music.exe
  • I:\autorun.inf
  • I:\Tarantula.exe
  • I:\Music.exe
  • J:\autorun.inf
  • J:\Tarantula.exe
  • J:\Music.exe
  • K:\autorun.inf
  • K:\Tarantula.exe
  • K:\Music.exe
  • L:\autorun.inf
  • L:\Tarantula.exe
  • L:\Music.exe
  • M:\autorun.inf
  • M:\Tarantula.exe
  • M:\Music.exe
  • N:\autorun.inf
  • N:\Tarantula.exe
  • N:\Music.exe
  • O:\autorun.inf
  • O:\Tarantula.exe
  • O:\Music.exe
  • P:\autorun.inf
  • P:\Tarantula.exe
  • P:\Music.exe
  • Q:\autorun.inf
  • Q:\Tarantula.exe
  • Q:\Music.exe
  • R:\autorun.inf
  • R:\Tarantula.exe
  • R:\Music.exe
  • S:\autorun.inf
  • S:\Tarantula.exe
  • S:\Music.exe
  • T:\autorun.inf
  • T:\Tarantula.exe
  • T:\Music.exe
  • U:\autorun.inf
  • U:\Tarantula.exe
  • U:\Music.exe
  • V:\autorun.inf
  • V:\Tarantula.exe
  • V:\Music.exe
  • W:\autorun.inf
  • W:\Tarantula.exe
  • W:\Music.exe
  • X:\autorun.inf
  • X:\Tarantula.exe
  • X:\Music.exe
  • Y:\autorun.inf
  • Y:\Tarantula.exe
  • Y:\Music.exe
  • Z:\autorun.inf
  • Z:\Tarantula.exe
  • Z:\Music.exe

Step 5

Search and delete this folder

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %User Profile%\tarantula

Step 6

Scan your computer with your Trend Micro product to delete files detected as WORM_SILLY.RUN. 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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