WORM_DORKBOT.DN

To get a one-glance comprehensive view of the behavior of this Worm, refer to the Threat Diagram shown below.

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

It runs certain commands that it receives remotely from a malicious user. Doing this puts the affected computer and information found on the computer at greater risk. It connects to a website to send and receive information.

It executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on 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:

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

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)

It injects threads into the following normal process(es):

• explorer.exe
• winlogon.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
{random} = "%User Profile%\Application Data\{random}.exe"

Propagation

This worm drops copies of itself in all removable drives.

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 characters}.exe
;{garbage characters}
icon=shell32.dll,7
;{garbage characters}
shell\open\command=RECYCLER\{random characters}.exe
;{garbage characters}
action=Open folder to view files
;{garbage characters}
shell\explore\command=RECYCLER\{random characters}.exe
;{garbage characters}
useautoplay=1

Backdoor Routine

This worm executes the following command(s) 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:

• ok77548.com
• ca98741.com
• zuf174.com
• 1k4j25.com

Download Routine

This worm accesses the following websites to download files:

• http://up.arabseyes.com/uploads/28_12_1213566658223.png

It saves the files it downloads using the following names:

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

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)

Trend Micro detects the dowloaded file as:

• WORM_DORKBOT.IF

It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

Other Details

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

• http://api.wipmania.com/

NOTES:

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 sites:

• 1and1
• 4shared
• AlertPay
• Bco Internacional
• Bebo
• BigString
• Brazzers
• Clave
• DepositFiles
• Dotster
• DynDNS
• eBay
• Email
• FLN-Password
• FLN-UserName
• Facebook
• FastMail
• FileServe
• FileSonic
• FreakShare
• Friendster
• Gmail
• Go Daddy
• Hack Forums
• Hotfile
• IKnowThatGirl
• Letitbit
• LogMeIn
• MediaFire
• Megaupload
• Message
• Moneybookers
• Moniker
• Namecheap
• Netflix
• Netload
• OfficeBanking
• Passwd
• PayPal
• Runescape
• SendSpace
• Sms4file
• SpeedyShare
• Steam
• The Pirate Bay
• TorrentLeech
• Twitter
• Uploaded
• Uploading.com
• Vip-file
• Vkontakte
• Webnames
• Whatcd
• Yahoo
• YouPorn
• YouTube

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 web site

It may also prevent the user from using the following applications:

• cmd.exe
• ipconfig.exe
• regedit.exe
• regsvr32.exe
• rundll32.exe
• verclsid.exe

It drops a shortcut file named "RECYCLER" pointing to the copy of itself in removable drives.

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

• mIRC
• MSN Messenger