WORM_DORKBOT.SS

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

• %User Profile%\Application Data\{random characters}.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.)

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
{malware file name} = "%User Profile%\Application Data\{malware file name}.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\{malware file name}.exe
;{garbage characters}
icon=shell32.dll,7
;{garbage characters}
shell\open\command=RECYCLER\{malware file name}.exe
;{garbage characters}
action=Open folder to view files
;{garbage characters}
shell\explore\command=RECYCLER\{malware 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
• mIRC

Backdoor Routine

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

• {BLOCKED}tf404.com
• {BLOCKED}.com
• {BLOCKED}6.com
• {BLOCKED}6.com
• {BLOCKED}5.com

Other Details

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

• http://api.wipmania.com/

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

NOTES:

This worm monitors the Internet activities of the infected system to steal user credentials if the user visits websites with the following strings:

• *&password=*
• *.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*
• *bebo.*/c/home/ajax_post_lifestream_comment
• *bebo.*/c/profile/comment_post.json
• *bebo.*/mail/MailCompose.jsp*
• *bigstring.*/*index.php*
• *clave=*
• *depositfiles.*/*/login*
• *dotster.com/*login*
• *dyndns*/account*
• *enom.com/login*
• *facebook.*/ajax/*MessageComposerEndpoint.php*
• *facebook.*/ajax/chat/send.php*
• *facebook.*/login.php*
• *fastmail.*/mail/*
• *fileserv.com/login*
• *filesonic.com/*login*
• *FLN-Password=*
• *freakshare.com/login*
• *friendster.*/rpc.php
• *friendster.*/sendmessage.php*
• *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.*/*direct_messages/new*
• *twitter.*/*status*/update*
• *twitter.com/sessions
• *txtpass=*
• *txtPassword=*
• *uploaded.to/*login*
• *uploading.com/*login*
• *vip-file.com/*/signin-do*
• *vkontakte.ru/api.php
• *vkontakte.ru/mail.php
• *vkontakte.ru/wall.php
• *webnames.ru/*user_login*
• *what.cd/login*
• *whcms*dologin*
• *youporn.*/login*
• bebo Comment
• bebo Lifestream
• bebo Message
• clave
• comment
• Email
• EmailName
• Facebook IM
• Facebook Message
• FLN-Password
• FLN-UserName
• Friendster Comment
• Friendster Message
• Friendster Shoutout
• login
• login.Pass
• login.User
• login[password]
• login[username]
• login_email
• login_pass
• login_password
• loginid
• loginname
• LoginPassword
• LoginUserName
• loginUserPassword
• Message
• msg_text
• numeroTarjeta
• Passwd
• Password
• quick_password
• quick_username
• screenname
• session[password]
• session[username_or_email]
• shoutout
• status
• TextfieldEmail
• TextfieldPassword
• token
• Twitter Message
• Twitter Tweet
• txtEmail
• txtpass
• txtPassword
• txtuser
• userid
• username
• vkontakte Chat
• vkontakte Message
• vkontakte Wall

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

• 1and1
• 4shared
• Alertpay
• Banco International
• Bebo
• BigString
• Brazzers
• Depositfiles
• Dotster
• DynDNS
• Facebook
• Fastmail
• Fileserve
• Filesonic
• Freakshare
• Friendster
• Gmail
• Godaddy
• Hackforums
• Hotfile
• IKnowThatGirl
• Letitbit
• LogMeIn
• Mediafire
• Megaupload
• Moneybookers
• Moniker
• Namecheap
• Netflix
• Netload
• OfficeBanking
• PayPal
• Runescape
• Sendspace
• Sms4file
• Speedyshare
• Steam
• Thepiratebay
• Torrentleech
• Twitter
• Uploaded
• Uploading
• Vip-file
• Vkontakte
• Webnames
• Whatcd
• Yahoo
• YouPorn
• YouTube

It monitors the following browsers:

• Flock
• Google Chrome
• Internet Explorer
• Mozilla Firefox
• Opera

It has the following backdoor capabilities:

• Join an IRC channel
• Update Itself
• Download other files
• Perfrom Slowloris, UDP, and SYN flooding
• Run Reverse Socks4 proxy server
• Send MSN Messenger messages
• Insert iframe tags into HTML files
• Visit a Web Site
• Block DNS
• Steal login credentials
• Log in to FTP sites
• Create processes
• Modify the following system files:
  
  ipconfig.exe
  verclsid.exe
  regedit.exe
  rundll32.exe
  cmd.exe
  regsvr32.exe

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

• CopyFileA
• CopyFileW
• CreateFileA
• DeleteFileA
• DeleteFileW
• DnsFree
• DnsQuery_A
• DnsQuery_W
• GetAddrInfoW
• HttpSendRequestA
• HttpSendRequestW
• InternetWriteFile
• MoveFileA
• MoveFileW
• NtEnumerateValueKey
• NtQueryDirectoryFile
• PR_Write
• RegCreateKeyExA
• RegCreateKeyExW
• URLDownloadToFileA
• URLDownloadToFileW

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.