WORM_DORKBOT.YBQ

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 executes commands from a remote malicious user, effectively compromising the affected system.

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:

• %Application Data%\ScreenSaverPro.scr
• %Application Data%\temp.bin
• %Application Data%\Microsoft\Stekec.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 adds the following processes:

• svchost.exe
• mspaint.exe

It injects itself into the following processes as part of its memory residency routine:

• created svchost.exe
• created mspaint.exe
• winlogon.exe
• explorer.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
Screen Saver Pro 3.1 = "%Application Data%\ScreenSaverPro.scr"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Stekec = "%Application Data%\Microsoft\Stekec.exe"

Other System Modifications

This worm adds the following registry keys:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Applets\
Paint

Propagation

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

• {Removable Drive Letter}:\ViewFiles.cmd
• {Removable Drive Letter}:\{Random File Name}.exe
• {Removable Drive Letter}:\{Random File Name}

It propagates via the following social networking sites:

• Bebo - in comments and messages
• Friendster - in messages, comments, shoutouts, chat
• Twitter - in tweets and direct messages
• Facebook - in messages, chat, and status updates

Backdoor Routine

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

• x.{BLOCKED}0000.com
• x.{BLOCKED}00.com
• x.{BLOCKED}000000.com

Other Details

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

• http://api.wipmania.com/
• http://api.wipmania.com.stcus.ru/icon/n.api

NOTES:

It drops a copy of itself in removable drives with a random file name.

It also drops .LNK files in removable drives. These dropped .LNK files use the names of the folders and files located on the said drives for their file names.

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:

• *.moneybookers.*/*login.pl
• *1and1.com/xml/config*
• *4shared.com/login*
• *:2082/login*
• *:2083/login*
• *:2086/login*
• *:2222/CMD_LOGIN*
• *FLN-Password=*
• *LoginPassword=*
• *Passwd=*
• *Password=*
• *TextfieldPassword=*
• *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*
• *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.yahoo.*/*login*
• *loginUserPassword=*
• *login_password=*
• *mediafire.com/*login*
• *megaupload.*/*login*
• *members*.iknowthatgirl*/members*
• *members.brazzers.com*
• *moniker.com/*Login*
• *namecheap.com/*login*
• *netflix.com/*ogin*
• *netload.in/index*
• *officebanking.cl/*login.asp*
• *oron.com/login*
• *paypal.*/webscr?cmd=_login-submit*
• *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*
• *thepiratebay.org/login*
• *torrentleech.org/*login*
• *twitter.*/*direct_messages/new*
• *twitter.*/*status*/update*
• *twitter.com/sessions
• *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*

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

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

It propagates via the following social media networks:

• Bebo (Comment, Message)
• Friendster (Message, Comment, Shoutout, Chat)
• Twitter (Tweet, Message)
• Facebook (Message, Chat, Status)

It monitors if browser accesses URLs with following strings and blocks the connection:

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