WORM_DORKBOT.PNT

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

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 files:

• {Removable Drive Letter}:\{Folder/File Name}.lnk

It drops the following copies of itself into the affected system:

• %Application Data%\Microsoft\{random}.exe (hidden)
• %Application Data%\ScreenSaverPro.scr
• %Application Data%\temp.bin

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

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"

Propagation

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

• {Removable Drive Letter}:\{random}.exe
• {Removable Drive Letter}:\ViewFiles.cmd

Backdoor Routine

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

• {BLOCKED}.{BLOCKED}.7.86:8888
• {BLOCKED}.{BLOCKED}.116.2

Download Routine

This worm connects to the following website(s) to download and execute a malicious file:

• http://{BLOCKED}.{BLOCKED}.237.48/33000.exe
• http://{BLOCKED}.{BLOCKED}.79.180/andro2.exe
• http://{BLOCKED}.{BLOCKED}.153.79/6541.exe
• http://{BLOCKED}.{BLOCKED}.237.48/6541.exe

It saves the files it downloads using the following names:

• %Application Data%\{random digit}.exe - detected as TROJ_LETHIC.PNT

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

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/

It deletes the initially executed copy of itself

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

The target property of the .LNK file contains the following format:

• %ALLUSERSPROFILE%\..\..\windows\system32\cmd.exe /c %SystemRoot%\explorer.exe %cd%{Target Folder/File} start %cd%{malware copy}.exe exit

It then 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 the 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