WORM_DORKBOT.DCL

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 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:

• %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 creates the following folders in all removable drives:

• {Removable Drive}:\RECYCLER

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

• {Removable Drive}:\RECYCLER\{random}.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}.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}}.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:

• MSN Messenger
• mIRC

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 websites to send and receive information:

• {BLOCKED}8.com
• {BLOCKED}1.com
• {BLOCKED}4.com
• {BLOCKED}arorz.com
• ns1.{BLOCKED}f.net
• {BLOCKED}.160.19
• {BLOCKED}.160.22
• {BLOCKED}.161.19
• {BLOCKED}.161.22

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 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 may also prevent the user from using the following applications:

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

It drops shortcut (.LNK) files named after the folders found in the removable drives which points to the copy of itself in the removable drives.

The target property of the .LNK files is the following:

• %windir%\system32\cmd.exe /c "start %cd%RECYCLER\{random}.exe &&%windir%\explorer.exe %cd%RSA

Then, it sets the folders' attribute to HIDDEN.

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:

• 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

It does not have rootkit capabilities.

It does not exploit any vulnerability.