VBS_BLEEWY.A

 Analysis by: Johnlery Triunfante

 ALIASES:

Worm:VBS/Beewly.A (Microsoft); Trojan.Agent.BJCI (Bitdefender)

 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.

  TECHNICAL DETAILS

File Size:

18,630 bytes

File Type:

VBS

Memory Resident:

Yes

Initial Samples Received Date:

20 Nov 2017

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 files:

  • {removable drive}:\{random hex string}
  • {removable drive}:\{folder name found in the removable drive}.lnk
  • {removable drive}:\Video {username}.lnk

It drops the following copies of itself into the affected system:

  • %Application Data%\{malware name}.vbs
  • {removable drive}:\{malware name}.vbs

(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

It creates the following folders:

  • {removable drive}:\Video {username}

Autostart Technique

This Worm creates the following registry entries to enable automatic execution of dropped component at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{malware name} = wscript.exe //B "%Application Data%\{malware name}.vbs"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
{malware name} = wscript.exe //B "%Application Data%\{malware name}.vbs"

Other System Modifications

This Worm adds the following registry keys:

HKEY_CURRENT_USER\Software\{random hex string}

It adds the following registry entries:

HKEY_CURRENT_USER\Software\UpdtW
(Default) = {execution date of malware}

HKEY_CURRENT_USER\Software\{malware name}
(Default) = "false - {MM}/{dd}/{yy} - {hh}:{mm}:"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
ShowSuperHidden = 0

Other Details

This Worm connects to the following possibly malicious URL:

  • http://{BLOCKED}70.{BLOCKED}p.me:1212/is-ready
  • http://{BLOCKED}mi.{BLOCKED}ly.com/uploads/3/7/9/7/37978295/sp.exe
  • http://{BLOCKED}mi123.{BLOCKED}ly.com/uploads/3/7/9/7/37978295/setup.vbs

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

13.800.02

FIRST VSAPI PATTERN DATE:

23 Nov 2017

VSAPI OPR PATTERN File:

13.801.00

VSAPI OPR PATTERN Date:

24 Nov 2017

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 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
    • {random hex string}

Step 5

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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • {malware name} = wscript.exe //B "%Application Data%\{malware name}.vbs"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • {malware name} = wscript.exe //B "%Application Data%\{malware name}.vbs"
  • In HKEY_CURRENT_USER\Software\UpdtW
    • (Default) = {execution date of malware}
  • In HKEY_CURRENT_USER\Software\{malware name}
    • (Default) = "false - {MM}/{dd}/{yy} - {hh}:{mm}:"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
    • ShowSuperHidden = 0

Step 6

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.
  • {removable drive}:\Video {username}

Step 7

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}:\{random hex string}
  • {removable drive}:\{folder name found in the removable drive}.lnk
  • {removable drive}:\Video {username}.lnk
  • %Application Data%\{malware name}.vbs
  • {removable drive}:\{malware name}.vbs

Step 8

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