WORM_DORKBOT.YBC
Windows
Threat Type: Worm
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
Propagates via removable drives
This worm arrives via removable drives.
It executes commands from a remote malicious user, effectively compromising the affected system.
TECHNICAL DETAILS
188,416 bytes
EXE
Yes
14 Oct 2014
Drops files, Steals information
Arrival Details
This worm arrives via removable drives.
Installation
This worm drops the following copies of itself into the affected system:
- %Application Data%\ScreenSaverPro.scr
- %Application Data%\temp.bin
- %Application Data%\Microsoft\Tnrwrp.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.)
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
Tnrwrp = "%Application Data%\Microsoft\Tnrwrp.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:
- {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:
- h.{BLOCKED}11128.com
- h.{BLOCKED}aa28.com
- h.{BLOCKED}28228.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.net/icon/n.api
NOTES:
This worm 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*
- *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*
- *FLN-Password=*
- *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*
- *login_password=*
- *LoginPassword=*
- *loginUserPassword=*
- *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*
- *Passwd=*
- *Password=*
- *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*
- *TextfieldPassword=*
- *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
- Fastmail
- Fileserve
- Filesonic
- FLN-Password
- FLN-UserName
- 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
- Uploaded
- Uploading.com
- Vip-file
- Vkontakte
- Webnames
- Whatcd
- Yahoo
- YouPorn
- YouTube
It monitors if browser accesses URLs with following strings to block 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
SOLUTION
9.700
11.210.05
14 Oct 2014
11.211.00
15 Oct 2014
Step 1
Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.
Step 2
Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.
Step 3
Restart in Safe Mode
Step 4
Delete this registry value
Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- Screen Saver Pro 3.1 = "%Application Data%\ScreenSaverPro.scr"
- Screen Saver Pro 3.1 = "%Application Data%\ScreenSaverPro.scr"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- Tnrwrp = "%Application Data%\Microsoft\Tnrwrp.exe"
- Tnrwrp = "%Application Data%\Microsoft\Tnrwrp.exe"
Step 5
Delete this registry key
Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Applets
- Paint
- Paint
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_DORKBOT.YBC. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.
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