WORM_DORKBOT.BZ

This worm arrives by connecting affected removable drives to a system. It may be downloaded by other malware/grayware/spyware from remote sites. It may be dropped by other malware. It may be unknowingly downloaded by a user while visiting malicious websites.

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 also has rootkit capabilities, which enables it to hide its processes and files from the user.

It deletes the initially executed copy of itself.

Arrival Details

This worm arrives by connecting affected removable drives to a system.

It may be downloaded by other malware/grayware/spyware from remote sites.

It may be dropped by other malware.

It may be unknowingly downloaded by a user while visiting malicious websites.

Installation

This worm drops the following copies of itself into the affected system:

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

(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)

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 file name} = "%User Profile%\Application Data\{random file name}.exe"

Propagation

This worm creates the following folders in all removable drives:

• RECYCLER

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

• {removable drive letter}:\RECYCLER\{random hexadecimal number}.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\{random file name}.exe
;{garbage characters}
icon=shell32.dll,7
;{garbage characters}
shell\open\command=RECYCLER\{random file name}.exe
;{garbage characters}
action=Open folder to view files
;{garbage characters}
shell\explore\command=RECYCLER\{random file name}.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:

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

Rootkit Capabilities

This worm also has rootkit capabilities, which enables it to hide its processes and files from the user.

Other Details

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

• http://api.wipmania.com/

It deletes the initially executed copy of itself

NOTES:

It hooks the following API functions to hide itself and to aid its routines:

• CopyFileA
• CopyFileW
• CreateFileA
• CreateFileW
• DeleteFileA
• DeleteFileW
• DnsQuery_A
• DnsQuery_W
• GetAddrInfoW
• HttpSendRequestA
• HttpSendRequestW
• InternetWriteFile
• LdrEnumerateLoadedModules
• LdrGetDllHandle
• LdrGetProcedureAddress
• LdrLoadDll
• MoveFileA
• MoveFileW
• NtEnumerateValueKey
• NtQueryDirectoryFile
• NtQueryInformationProcess
• NtQueryInformationThread
• NtQuerySystemInformation
• NtQueryVirtualMemory
• PR_Write
• RegCreateKeyExA
• RegCreateKeyExW
• RtlAnsiStringToUnicodeString
• URLDownloadToFileA
• URLDownloadToFileW

It drops the file {removable drive letter}:\RECYCLER\Desktop.ini to change the icon of the RECYCLER folder into the Recycle Bin icon.

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 connects to a random IP address to send and receive information.

It has the following backdoor capabilities:

• 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 website

It steals the login credentials to websites by checking the following strings in the URL:

• *&password=*
• *&txtPassword=*
• *.moneybookers.*/*login.pl
• *1and1.com/xml/config*
• *4shared.com/login*
• *:2082/login*
• *:2083/login*
• *:2086/login*
• *:2222/CMD_LOGIN*
• *alertpay.com/login*
• *aol.*/*login.psp*
• *bcointernacional*login*
• *bigstring.*/*index.php*
• *clave=*
• *depositfiles.*/*/login*
• *dotster.com/*login*
• *dyndns*/account*
• *enom.com/login*
• *facebook.*/login.php*
• *fastmail.*/mail/*
• *fileserv.com/login*
• *filesonic.com/*login*
• *FLN-Password=*
• *freakshare.com/login*
• *gmx.*/*FormLogin*
• *godaddy.com/login*
• *google.*/*ServiceLoginAuth*
• *hackforums.*/member.php
• *hotfile.com/login*
• *letitbit.net*
• *login.live.*/*post.srf*
• *login.Pass=*
• *login.yahoo.*/*login*
• *login_pass=*
• *login_password=*
• *LoginPassword=*
• *loginUserPassword=*
• *mediafire.com/*login*
• *megaupload.*/*login*
• *members*.iknowthatgirl*/members*
• *members.brazzers.com*
• *moniker.com/*Login*
• *namecheap.com/*login*
• *netflix.com/*ogin*
• *netload.in/index*
• *no-ip*/login*
• *officebanking.cl/*login.asp*
• *oron.com/login*
• *pas=*
• *pass=*
• *Passwd=*
• *password=*
• *password]=*
• *paypal.*/webscr?cmd=_login-submit*
• *pw=*
• *runescape*/*weblogin*
• *screenname.aol.*/login.psp*
• *secure.logmein.*/*logincheck*
• *sendspace.com/login*
• *service=youtube*
• *signin.ebay*SignIn
• *sms4file.com/*/signin-do*
• *speedyshare.com/login*
• *steampowered*/login*
• *TextfieldPassword=*
• *thepiratebay.org/login*
• *torrentleech.org/*login*
• *twitter.com/sessions
• *txtpass=*
• *uploaded.to/*login*
• *uploading.com/*login*
• *vip-file.com/*/signin-do*
• *webnames.ru/*user_login*
• *what.cd/login*
• *whcms*dologin*
• *youporn.*/login*
• 1and1
• 4shared
• Alertpay
• Bcointernacional
• BigString
• Brazzers
• clave
• Depositfiles
• Dotster
• DynDNS
• email
• EmailName
• Facebook
• Fastmail
• Fileserve
• Filesonic
• FLN-Password
• FLN-UserName
• Freakshare
• Gmail
• Godaddy
• Hackforums
• Hotfile
• IKnowThatGirl
• Letitbit
• login
• login.Pass
• login.User
• login_email
• login_pass
• login_password
• loginId
• loginname
• LoginPassword
• loginUserName
• loginUserPassword
• LogMeIn
• Mediafire
• Megaupload
• Moneybookers
• Moniker
• Namecheap
• Netflix
• Netload
• numeroTarjeta
• OfficeBanking
• Passwd
• password
• quick_password
• quick_username
• Runescape
• screenname
• Sendspace
• session[password]
• session[username_or_email]
• Sms4file
• Speedyshare
• Steam
• TextfieldEmail
• TextfieldPassword
• Thepiratebay
• token
• Torrentleech
• Twitter
• txtEmail
• txtpass
• txtPassword
• txtuser
• Uploaded
• Uploading
• userid
• username
• Vip-file
• Webnames
• Whatcd
• Yahoo
• YouPorn
• YouTube

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

• AlertPay
• AOL
• BigString
• Brazzers
• Depositfiles
• Dotster
• DynDNS
• E-bay
• Facebook
• Fastmail
• FileServe
• FileSonic
• FreakShare
• Gmail
• GMX
• Go Daddy
• Hackforums
• Hotfile
• Letitbit
• LogMeIn
• MediaFire
• Megaupload
• Moneybookers
• Moniker
• Namecheap
• Netflix
• Netload Serious Filehosting
• No-IP
• OfficeBanking
• Oron
• PayPal
• Runescape
• SendSpace
• sms4file
• Speedy Share
• Steam
• TorrentLeech
• Twitter
• The Piraye Bay
• uploaded
• Uploading
• ViP-file
• Webnames (Russia)
• What.CD
• Windows Live
• Yahoo
• YouPorn
• YouTube
• 4shared

It blocks connections to sites if the URL contains the following anti-virus related strings:

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

It displays the following message box, then corrupts the hard disk of an infected system if the important parts of the malware are modified: