VBS_OTORUN.FW

 Analysis by: Byron Jon Gelera

 ALIASES:

Worm:VBS/Autorun.QA (Microsoft); Worm.VBS.Autorun.ky (Kaspersky); VBS/AutoRun.CU (ESET-NOD32)

 PLATFORM:

Windows

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

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


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

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

However, as of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size:

4,354 bytes

File Type:

VBS

Memory Resident:

Yes

Initial Samples Received Date:

28 Mar 2012

Arrival Details

This worm arrives via removable drives.

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:

  • {Fixed Drive Letter}:\{Malware Name}

It adds the following processes:

  • wmplayer.exe
  • iexplore.exe
  • firefox.exe

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
MediaPlayer = "%System Root%\{Malware Name}"

Other System Modifications

This worm adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
Start Page = "http://nagon.net/"

Propagation

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

  • {Removable Drive Letter}:\{Malware Name}

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

Other Details

This worm connects to the following possibly malicious URL:

  • http://{BLOCKED}n.net/
  • http://{BLOCKED}v.ru/asx/tv_id11.asx
  • http://www.{BLOCKED}television.org/live/live270.asx
  • http://www.{BLOCKED}r.by/liveair/btv.asx
  • http://{BLOCKED}v.ru/asx/tv_id428.asx
  • http://www.{BLOCKED}i.ru/video1.asx?vid=onair
  • http://{BLOCKED}v.ru/asx/tv_id897.asx
  • http://{BLOCKED}v.ru/asx/tv_id509.asx
  • mms://{BLOCKED}.{BLOCKED}.226.11/MIRTV_300
  • http://{BLOCKED}v.ru/asx/tv_id840.asx
  • http://{BLOCKED}v.ru/asx/tv_id59.asx
  • http://{BLOCKED}v.ru/asx/tv_id1357.asx
  • http://{BLOCKED}v.ru/asx/tv_id549.asx
  • http://{BLOCKED}v.ru/asx/tv_id818.asx
  • http://{BLOCKED}v.ru/asx/tv_id886.asx
  • http://{BLOCKED}v.ru/asx/tv_id575.asx
  • http://{BLOCKED}v.ru/asx/tv_id579.asx
  • http://{BLOCKED}v.ru/asx/tv_id858.asx
  • http://{BLOCKED}v.ru/asx/tv_id215.asx
  • http://{BLOCKED}v.ru/asx/tv_id389.asx
  • http://{BLOCKED}v.ru/asx/tv_id1170.asx
  • http://{BLOCKED}.{BLOCKED}.143.2:8080/
  • http://{BLOCKED}v.ru/asx/tv_id586.asx

However, as of this writing, the said sites are inaccessible.

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

12.904.04

FIRST VSAPI PATTERN DATE:

17 Nov 2016

VSAPI OPR PATTERN File:

12.905.00

VSAPI OPR PATTERN Date:

18 Nov 2016

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

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Restart in Safe Mode

[ Learn More ]

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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • MediaPlayer = "%System Root%\{Malware Name}"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
    • Start Page = "http://nagon.net/"

Step 5

Search and delete these files

[ Learn More ]
There may be some 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.
  • {Removable Drive Letter}:\autorun.inf

Step 6

Restart in normal mode and scan your computer with your Trend Micro product for files detected as VBS_OTORUN.FW. 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 7

Trend Micro Mobile Security Solution

Trend Micro Mobile Security Personal Edition protects Android and iOS smartphones and tablets from malicious and Trojanized applications. It blocks access to malicious websites, increase device performance, and protects your mobile data. You may download the Trend Micro Mobile Security apps from the following sites:

Step 8

Scan your computer with your Trend Micro product to delete files detected as VBS_OTORUN.FW. 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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