WORM_DORKBOT.JBS

 Analysis by: Rhena Inocencio

 ALIASES:

Trojan:Win32/Klibot.A (Microsoft), a variant of Win32/Injector.OPV (ESET)

 PLATFORM:

Windows

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

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Propagates via removable drives, Dropped by other malware, Downloaded from the Internet


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 is injected into all running processes to remain memory resident.

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

It executes commands from a remote malicious user, effectively compromising the affected system. It connects to a website to send and receive information.

It terminates itself if it detects it is being run in a virtual environment. It deletes the initially executed copy of itself.

  TECHNICAL DETAILS

File Size:

77,312 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

23 Mar 2016

Payload:

Connects to URLs/IPs, Compromises system security, Steals information

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 and executes them:

  • %Application Data%\{random file name}.exe

(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 is injected into all running processes to remain memory resident.

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Adobe Reader Speed Launcher = "%Application Data%\{random file name}.exe"

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Run
Adobe Reader Speed Launcher = "%Application Data%\{random file name}.exe"

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows NT\CurrentVersion\Winlogon
Adobe Reader Speed Launcher = "%Application Data%\{random file name}.exe"

It drops the following files:

  • {removable drive letter}:\{folder name}.lnk
  • {removable drive letter}:\AdobeReader\DSC_5932.jpg - copy of itself

Propagation

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

It sends messages that contain links to sites hosting remote copies of itself using the following instant-messaging (IM) applications:

  • Digsby
  • Mirc
  • MSN Messenger
  • Pidgin
  • Trillian
  • Windows Live Messenger
  • Windows Messenger
  • Xchat

Backdoor Routine

This worm executes the following commands from a remote malicious user:

  • Update itself
  • Download other files
  • Perfrom Slowloris, UDP, and SYN flooding
  • Send MSN Messenger messages
  • Insert iframe tags into HTML files
  • Visit a Web page
  • Create processes
  • Block DNS
  • Redirect domains
  • Steal login credentials
  • Log in to FTP sites

It connects to the following websites to send and receive information:

  • http://{BLOCKED}x.kasprsky.org/cynic/gate.php

Other Details

This worm terminates itself if it detects it is being run in a virtual environment.

It deletes the initially executed copy of itself

NOTES:

It disables the user from using specific applications with the following strings:

  • smsniff.exe
  • tcpview.exe
  • wireshark.exe

It drops shortcut files pointing to the copy of itself in removable drives. These dropped .LNK files use the names of the folders located on the said drives for their file names. It then sets the attributes of the original folders to Hidden to trick the user into clicking the .LNK files.

It monitors the Internet activities of the affected system to steal user credentials if the user visits websites with the following strings:

  • &Message=
  • &message=
  • &msg_text=
  • &postText=
  • &question=
  • &req0_text=
  • &status=
  • &xhpc_message=
  • *.bebo.com/c/home20/update_saying*
  • *.bebo.com/c/profile/comment_post.json*
  • *.ebuddy.com/dispatch*
  • *.facebook.*/ajax/chat/send1.php*
  • *.facebook.*/ajax/updatestatus.php*
  • *.formspring.me/profile/ask/*
  • *.google.*/ServiceLoginAuth*
  • *.google.com/*
  • *.moneybookers.com/app/login*
  • *.yahoo.*/*login*
  • *:2082/login*
  • *:2083/login*
  • *:2086/login*
  • *:2087/login*
  • *:2222/CMD_LOGIN*
  • *badoo.com/connections/ws-post.phtml*
  • *blockbuster.com/auth/processLogin*
  • *fileserve.com/login*
  • *hackforums.net/member.php*
  • *hotfile.com/login*
  • *linkedin.com/share?submitPost=*
  • *login.bangbros.st-secure.com/*
  • *login.live.*/*post.srf*
  • *members.brazzers.com/*
  • *myspace.*/Modules/PageEditor/Handlers/Common/SaveStatus.ashx
  • *netflix.com/Login*
  • *paypal.*/webscr?cmd=_login-submit*
  • *pornhub.com/login*
  • *thepiratebay.org/login*
  • *twitter.*/*status*/update*
  • *twodollarclick.com/*
  • *uploading.com/general/login_form*
  • *webnames.ru/*user_login*
  • *wmtransfer.com/login.aspx*
  • adf.ly
  • adf.ly/login*
  • anonymous
  • bangbros.com
  • blockbuster.com
  • brazzers.com
  • fileserve.com
  • gmail.com
  • hackforums.net
  • hotfile.com
  • linkbucks.com
  • linkbucks.com/*
  • live.com
  • members.naughtyamerica.com/*
  • moneybookers.com
  • naughtyamerica.com
  • netflix.com
  • ntdll.dll
  • paypal.com
  • pornhub.com
  • thepiratebay.org
  • twodollarclick.com
  • webnames.ru
  • wmtransfer.com
  • yahoo.com
  • zpag.es
  • zpag.es/login*

It attempts to steal user credentials used in the following websites:

  • badoo
  • bangbros
  • bebo
  • blockbuster.com
  • brazzers
  • ebuddy
  • facebook
  • fileserve
  • formspring
  • gmail
  • google
  • hackforums
  • hotfile
  • linkbucks
  • linkedin
  • live
  • moneybookers
  • myspace
  • naughtyamerica
  • netflix
  • paypal
  • pornhub
  • thepiratebay
  • twitter
  • twodollarclick
  • uploading
  • wmtransfer
  • yahoo
  • zpag

  SOLUTION

Minimum Scan Engine:

9.800

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

Scan your computer with your Trend Micro product and note files detected as WORM_DORKBOT.JBS

Step 4

Restart in Safe Mode

[ Learn More ]

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
    • Adobe Reader Speed Launcher = "%Application Data%\{random file name}.exe"
  • In HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
    • Adobe Reader Speed Launcher = "%Application Data%\{random file name}.exe"
  • In HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Winlogon
    • Adobe Reader Speed Launcher = "%Application Data%\{random file name}.exe"

Step 6

Search and delete this file

[ 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}:\{folder name}.lnk
  • {removable drive letter}:\AdobeReader\DSC_5932.jpg

Step 7

  1. Open a command prompt.
    • For Windows 2000, Windows XP, and Windows Server 2003 users, click Start>Run. In the Search box, type CMD then press Enter.
    • For Windows Vista, Windows 7, and Windows Server 2008 users, click Start, type CMD in the Search input field then press Enter.
    • For Windows 8, Windows 8.1, and Windows Server 2012 users, right-click on the lower-left corner of the screen, click Command Prompt.
  2. In the CMD console, type the following:

    ATTRIB [+R | -R] [+A | -A ] [+S | -S] [+H | -H] [+I | -I] [drive:][path][file name] [/S [/D] [/L]]

    Where:
    + Sets an attribute.
    - Clears an attribute
    R Read-only file attribute
    A Archive file attribute
    S System file attribute
    H Hidden file attribute
    I Not content indexed file attribute
    [drive:][path][filename]
    Specifies a file or files for attrib to process
    /S Processes matching files in the current folder and all subfolders.
    /D Processes folders
    /L Work on the attributes of the Symbolic Link versus the target of the Symbolic Link
    Example:
    To unhide all files and folders (including subfolders) in drive D:
    ATTRIB –H D:\* /S /D
  3. Repeat Step 3 for folders and files in other drives or folders.

Step 8

Search and delete AUTORUN.INF files created by WORM_DORKBOT.JBS that contain these strings

[ Learn More ]
  • AdobeReader\DSC_5932.jpg

Step 9

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