WORM_DORKBOT.XXST

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 copies of itself into all the removable drives connected to an affected system. 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.

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}.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
{random} = "%Application Data%\{random}.exe"

Propagation

This worm drops copies of itself into all the removable drives connected to an affected system.

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.

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

• Windows Live Communicator
• MSN Messenger
• Pidgin
• Xchat
• mIRC

Backdoor Routine

This worm joins any of the following IRC channel(s):

• #rkill
• #pd
• #lo
• #rox

It executes the following commands from a remote malicious user:

• Block DNS
• Create processes
• Download other files
• Insert iFrame tags into HTML files
• Join an IRC channel
• Log in to FTP sites
• Perform Slowloris, UDP, and SYN flooding
• Run Reverse Socks4 proxy server
• Send MSN Messenger messages
• Steal login credentials
• Update itself
• Visit a web site

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

• {BLOCKED}merz.gov
• {BLOCKED}4.{BLOCKED}ge.com
• {BLOCKIED}4.{BLOCKED}iy.com

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:

• It monitors the user's browsing activities. It gathers the user's login ID, password and email when the site accessed by the user contains the following strings:
  • secure.logmein.*/*logincheck*
  • LogMeIn
  • *megaupload.*/*login
  • Megaupload
  • loginUserPassword
  • loginUserName
  • *loginUserPassword=*
  • *fileserve.*/login*FileServe
  • *password]=*
  • *twitter.com/sessions
  • Twitter*:2086/login*
  • *:2083/login*
  • *&Password=*
  • *.alertpay.*/*login.aspx
  • AlertPay
  • txtPasswordtxtEmail
  • *&txtPassword=*
  • *.moneybookers.*/*login.pl
  • Moneybookers
  • *runescape*/*weblogin*
  • Runescape
  • *dyndns*/account*
  • DynDNS
  • *&password=*
  • *no-ip*/login*
  • NoIP
  • *steampowered*/login*
  • Steam
  • quick_password
  • quick_username
  • username
  • *hackforums.*/member.php
  • Hackforums
  • email
  • *facebook.*/login.php*
  • Facebook
  • *login.yahoo.*/*login*
  • Yahoo
  • passwd
  • login
  • *passwd=*
  • *login.live.*/*post.srf*
  • Live
  • TextfieldPassword
  • TextfieldEmail
  • *TextfieldPassword=*
  • *gmx.*/*FormLogin*
  • GMX
  • *Passwd=*
  • Gmail
  • FLN-Password
  • FLN-UserName
  • *FLN-Password=*
  • *fastmail.*/mail/*
  • Fastmail
  • *pass=*
  • *bigstring.*/*index.php*
  • BigString
  • screenname
  • *screenname.aol.*/login.psp*
  • loginId
  • *password=*
  • *aol.*/*login.psp*
  • AOLPasswd
  • Email*service=youtube*
  • *google.*/*ServiceLoginAuth*
  • YouTube
  • login_email
  • *login_password=*
  • *paypal.*/webscr?cmd=_login-submit*PayPal
• It blocks users from accessing websites with the following strings:
  • webroot
  • fortinet
  • virusbuster
  • nprotect
  • gdatasoftware
  • virus
  • precisesecurity
  • lavasoft
  • heck
  • tc
  • emsisoft
  • onlinemalwarescanner
  • necare.live
  • f-secure
  • bullguard
  • clamav
  • pandasecurity
  • sophos
  • malwarebytes
  • sunbeltsoftware
  • norton
  • norman
  • mcafee
  • symantec
  • comodo
  • avast
  • avira
  • avg
  • bitdefender
  • eset
  • kaspersky
  • trendmicro
  • iseclab
  • virscan
  • garyshood
  • viruschief
  • jotti
  • threatexpert
  • novirusthanks
  • virustotal
• 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.