WORM_DORKBOT.JBR

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 then deletes itself afterward. It is injected into all running processes to remain memory resident.

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.

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 file name}.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.)

It executes then deletes itself afterward.

It is injected into all running processes to remain memory resident.

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
Adobe Reader Speed Launcher = "%User Profile%\Application Data\{malware file name}.exe"

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Run
Adobe Reader Speed Launcher = "%User Profile%\Application Data\{malware file name}.exe"

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows NT\CurrentVersion\Winlogon
Adobe Reader Speed Launcher = "%User Profile%\Application Data\{malware file name}.exe"

Propagation

This worm creates the following folders in all removable drives:

• {drive letter}:\AdobeReader

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

• {drive letter}:\AdobeReader\DSCI4930.jpg

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:

;{garbage}
[autorun]
;{garbage}
action=Open folder to view files
;{garbage}
icon=shell32.dll,4
;{garbage}
open=AdobeReader\DSCI4930.jpg
;{garbage}
shell\Explore=Explore
;{garbage}
shell\Explore\command=AdobeReader\DSCI4930.jpg
;{garbage}
shell=Explore
;{garbage}
UseAutoPlay=1
;{garbage}

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

• Digsby
• Mirc
• MSN Messenger
• Pidgin
• Trillian
• Windows Live Messenger
• Windows Messenger
• Xchat

Backdoor Routine

This worm executes the following commands from a remote malicious user:

• Update itself
• Download other files
• Perfrom Slowloris, UDP, and SYN flooding
• Send MSN Messenger messages
• Insert iframe tags into HTML files
• Visit a Web page
• Create processes
• Block DNS
• Redirect domains
• Steal login credentials
• Log in to FTP sites

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

• {BLOCKED}o.{BLOCKED}ky.org/ngrs/gate.php
• {BLOCKED}o.{BLOCKED}strz.org/ngrs/gate.php

NOTES:

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.

It monitors the Internet activities of the affected system to steal user credentials if the user visits websites with the following strings:

• &message=
• &Message=
• &msg_text=
• &postText=
• &question=
• &req0_text=
• &status=
• &xhpc_message=
• *.bebo.com/c/home20/update_saying*
• *.bebo.com/c/profile/comment_post.json*
• *.ebuddy.com/dispatch*
• *.facebook.*/ajax/chat/send1.php*
• *.facebook.*/ajax/updatestatus.php*
• *.formspring.me/profile/ask/*
• *.google.*/ServiceLoginAuth*
• *.google.com/*
• *.moneybookers.com/app/login*
• *.yahoo.*/*login*
• *:2082/login*
• *:2083/login*
• *:2086/login*
• *:2087/login*
• *:2222/CMD_LOGIN*
• *badoo.com/connections/ws-post.phtml*
• *blockbuster.com/auth/processLogin*
• *fileserve.com/login*
• *hackforums.net/member.php*
• *hotfile.com/login*
• *linkedin.com/share?submitPost=*
• *login.bangbros.st-secure.com/*
• *login.live.*/*post.srf*
• *members.brazzers.com/*
• *myspace.*/Modules/PageEditor/Handlers/Common/SaveStatus.ashx
• *netflix.com/Login*
• *paypal.*/webscr?cmd=_login-submit*
• *pornhub.com/login*
• *thepiratebay.org/login*
• *twitter.*/*status*/update*
• *twodollarclick.com/*
• *uploading.com/general/login_form*
• *webnames.ru/*user_login*
• *wmtransfer.com/login.aspx*
• adf.ly
• adf.ly/login*
• Badoo Message
• bangbros.com
• Bebo Post
• Bebo Status
• blockbuster.com
• brazzers.com
• e_message=
• eBuddy IM
• email=
• Email=
• Facebook IM
• Facebook Wallpost
• fileserve.com
• form_pwd=
• form_user=
• Formspring Question
• gmail.com
• GTalk IM
• hackforums.net
• hotfile.com
• linkbucks.com
• linkbucks.com/*
• Linkedin Status Update
• live.com
• login_email=
• login_password=
• login=
• Login=
• loginEmail=
• loginPassword=
• loginUserName=
• loginUserPassword=
• members.naughtyamerica.com/*
• moneybookers.com
• Myspace Status Update
• naughtyamerica.com
• netflix.com
• pass=
• passwd=
• Passwd=
• Password=
• password=
• paypal.com
• pornhub.com
• quick_password=
• quick_username=
• status=
• thepiratebay.org
• Tweet
• twodollarclick.com
• txtEmail=
• txtPassword=
• uploading.com
• user=
• Username=
• username=
• webnames.ru
• wmtransfer.com
• yahoo.com
• zpag.es
• zpag.es/login*

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

• badoo
• bangbros
• bebo
• blockbuster.com
• brazzers
• ebuddy
• facebook
• fileserve
• formspring
• gmail
• google
• hackforums
• hotfile
• linkbucks
• linkedin
• live
• moneybookers
• myspace
• naughtyamerica
• netflix
• paypal
• pornhub
• thepiratebay
• twitter
• twodollarclick
• uploading
• wmtransfer
• yahoo
• zpag

It blocks access to websites with the following strings:

• ad.doubleclick.net
• ad.fastclick.net
• ads.fastclick.net
• anti
• anti-virus.by
• ar.atwola.com
• atdmt.com
• avast.com
• avg.com
• avira.com
• avp.ch
• avp.com
• avp.ru
• awaps.net
• banner.fastclick.net
• banners.fastclick.net
• bitdefender.com
• comodo.com
• customer.symantec.com
• eset.com
• f-secure.com
• free-av.com
• gdata.de
• hijackthis.de
• housecall.com
• jotti.org
• kaspersky-labs.com
• kaspersky.com
• kaspersky.ru
• liveupdate.symantec.com
• liveupdate.symantecliveupdate.com
• mcafee.com
• novirusthanks.org
• pandasecurity.com
• securityresponse.symantec.com
• service1.symantec.com
• sophos.com
• sophos.fr
• symantec.com
• threatexpert.com
• trendmicro.com
• updates.symantec.com
• virus.org
• viruslist.com
• viruslist.ru
• virustotal.com

It may also disable the user from using the following applications with the following strings:

• comm
• smsniff.exe
• tcpview.exe
• wireshark.exe