WORM_DORKBOT.NS

This worm monitors the Internet activities of the infected system to steal user credentials if the user visits websites with certain strings. It attempts to steal user credentials used in the certain websites. It monitors certain browsers. It has backdoor capabilities. It modifies the following system files. It hooks the following API to hide itself and to aid its routines.

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.

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 prevents users from visiting antivirus-related websites that contain specific strings. It deletes the initially executed copy of itself.

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 a copy of itself in the following folders using different file names:

• %Application Data%\{random characters}.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.

It adds the following mutexes to ensure that only one of its copies runs at any one time:

• Snipa-Mutex

It injects codes into the following process(es):

• explorer.exe
• winlogon.exe
• svchost.exe

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
{filename of dropped copy} = "%Application Data%\{filename of dropped copy}.exe"

Propagation

This worm creates the following folders in all removable drives:

• {drive letter}:\RECYCLER

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

• {drive letter}:\RECYCLER\{random characters}.exe

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

The said .INF file contains the following strings:

[AutoRun]
;{garbage characters}
shellexecute=RECYCLER\{file name of malware copy}.exe
;{garbage characters}
icon=shell32.dll,7
;{garbage characters}
shell\open\command=RECYCLER\{file name of malware copy}.exe
;{garbage characters}
action=Open folder to view files
;{garbage characters}
shell\explore\command=RECYCLER\{file name of malware copy}.exe
;{garbage characters}
useautoplay=1

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

• XChat
• Windows Messenger
• Windows Live Communicator
• MSN Messenger
• Pidgin

Backdoor Routine

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

• Join an IRC channel
• Send private messages on IRC channel joined
• Update self
• Download arbitrary files
• Send MSN Messenger messages
• Insert iframe tags into HTML files
• Visit arbitrary website
• Block arbitrary DNS
• Steal login credentials
• Log in to FTP sites
• Create arbitrary processes
• Can modifies the following system files:
  • ipconfig.exe
  • verclsid.exe
  • regedit.exe
  • rundll32.exe
  • cmd.exe
  • regsvr32.exe
• Perform DDOS attack

It connects to the following URL(s) to send and receive commands from a remote malicious user:

• {BLOCKED}ney.biz:53
• {BLOCKED}h.biz:53
• {BLOCKED}rbitch.com:53
• {BLOCKED}pussy.info:53

Information Theft

This worm targets the following websites:

• OfficeBanking
• Megaupload
• FileServe
• Twitter
• AlertPay
• Moneybookers
• LogMeIn
• Runescape
• DynDNS
• Steam
• Hackforums
• Facebook
• Yahoo
• Gmail
• Fastmail
• BigString
• AOL
• YouTube
• PayPal

Other Details

This worm connects to the following URL(s) to get the affected system's IP address:

• api.wipmania.com

It does the following:

• This worm monitors the Internet activities of the infected system to steal user credentials if the user visits websites with the following strings:
  
  • *officebanking.cl/*login.asp*
  • *secure.logmein.*/*logincheck*
  • *megaupload.*/*login
  • loginUserPassword
  • loginUserName
  • *loginUserPassword=*
  • *fileserve.*/login*
  • session[password]
  • session[username_or_email]
  • *password]=*
  • *twitter.com/sessions
  • *:2086/login*
  • *:2083/login*
  • Password
  • EmailName
  • *&Password=*
  • *.alertpay.*/*login.aspx
  • txtPassword
  • txtEmail
  • *&txtPassword=*
  • *.moneybookers.*/*login.pl
  • *runescape*/*weblogin*
  • *dyndns*/account*
  • *&password=*
  • *no-ip*/login*
  • *steampowered*/login*
  • quick_password
  • quick_username
  • username
  • *hackforums.*/member.php
  • email
  • *facebook.*/login.php*
  • *login.yahoo.*/*login*
  • passwd
  • login
  • *passwd=*
  • *login.live.*/*post.srf*
  • TextfieldPassword
  • TextfieldEmail
  • *TextfieldPassword=*
  • *gmx.*/*FormLogin*
  • *Passwd=*
  • FLN-Password
  • FLN-UserName
  • *FLN-Password=*
  • *fastmail.*/mail/*
  • *pass=*
  • *bigstring.*/*index.php*
  • screenname
  • *screenname.aol.*/login.psp*
  • password
  • loginId
  • *password=*
  • *aol.*/*login.psp*
  • Passwd
  • Email
  • *service=youtube*
  • *google.*/*ServiceLoginAuth*
  • login_password
  • login_email
  • *login_password=*
  • *paypal.*/webscr?cmd=_login-submit*
  
  
• This worm monitors and captures messages posted on comment boxes on websites with the following URL strings:
  
  • comment-text
  • *bebo.*/c/home/ajax_post_lifestream_comment
  • bebo Lifestream
  • *bebo.*/c/profile/comment_post.json
  • bebo Comment
  • Message
  • *bebo.*/mail/MailCompose.jsp*
  • bebo Message
  • *friendster.*/sendmessage.php*
  • Friendster Message
  • comment
  • Friendster Comment
  • shoutout
  • *friendster.*/rpc.php
  • Friendster Shoutout
  • *vkontakte.ru/mail.php
  • vkontakte Message
  • *vkontakte.ru/wall.php
  • vkontakte Wall
  • message
  • *vkontakte.ru/api.php
  • vkontakte Chat
  • *twitter.*/*direct_messages/new*
  • Twitter Message
  • *twitter.*/*status*/update*
  • Twitter Tweet
  • status
  • *facebook.*/ajax/*MessageComposerEndpoint.php*
  • Facebook Message
  • msg_text
  • *facebook.*/ajax/chat/send.php*
  • Facebook IM
  
  
• 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 following application:
  
  • mIRC
  • Internet Explorer
  • Mozilla Firefox

It prevents users from visiting antivirus-related websites that contain the following strings:

• webroot
• fortinet
• virusbuster
• nprotect
• gdatasoftware
• virus
• precisesecurity
• lavasoft
• heck.tc
• emsisoft
• onlinemalwarescanner
• onecare.live
• f-secure
• bullguard
• clamav
• pandasecurity
• sophos
• malwarebytes
• sunbeltsoftware
• norton
• norman
• mcafee
• symantec
• comodo
• avast
• avira
• bitdefender
• eset
• kaspersky
• trendmicro
• iseclab
• virscan
• garyshood
• viruschief
• jotti
• threatexpert
• novirusthanks
• virustotal

It deletes the initially executed copy of itself