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WORM_DORKBOT.ACC

January 19, 2013
 Analysis by: Adrianne Chester Camat
 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Propagates via removable drives, Downloaded from the Internet

This worm arrives by connecting affected removable drives to a system. It may be unknowingly downloaded by a user while visiting malicious websites.

It drops copies of itself into all the removable drives connected to an affected system.

It deletes itself after execution.

  TECHNICAL DETAILS

File Size:

150,154 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

19 Jul 2011

Payload:

Compromises system security, Steals information

Arrival Details

This worm arrives by connecting affected removable drives to a system.

It may be unknowingly downloaded by a user while visiting malicious websites.

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

Autostart Technique

This worm adds the following registry entries to enable its automatic execution at every system startup:

HKCU\Software\Microsoft\
Windows\CurrentVersion\Run
{random} = "%User Profile%\Application Data\{random}.exe"

Propagation

This worm drops copies of itself into all the removable drives connected to an affected system.

Backdoor Routine

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

  • niidea.net
  • ngr.hostname.ns1.name
  • ngrnd.scrapping.cc
  • ngrnd.zapto.org
  • ngr.dns02.ns2.name

Other Details

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

  • http://api.wipmania.com

It deletes itself after execution.

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:

  • *&password=*
  • *&txtPassword=*
  • *.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*
  • *bigstring.*/*index.php*
  • *clave=*
  • *depositfiles.*/*/login*
  • *dotster.com/*login*
  • *dyndns*/account*
  • *enom.com/login*
  • *facebook.*/login.php*
  • *fastmail.*/mail/*
  • *fileserv.com/login*
  • *filesonic.com/*login*
  • *FLN-Password=*
  • *freakshare.com/login*
  • *gmx.*/*FormLogin*
  • *godaddy.com/login*
  • *google.*/*ServiceLoginAuth*
  • *hackforums.*/member.php
  • *hotfile.com/login*
  • *letitbit.net*
  • *login.live.*/*post.srf*
  • *login.Pass=*
  • *login.yahoo.*/*login*
  • *login_pass=*
  • *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*
  • *no-ip*/login*
  • *officebanking.cl/*login.asp*
  • *oron.com/login*
  • *pas=*
  • *pass=*
  • *Passwd=*
  • *Password=*
  • *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.com/sessions
  • *txtpass=*
  • *uploaded.to/*login*
  • *uploading.com/*login*
  • *vip-file.com/*/signin-do*
  • *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
  • AOL
  • Bcointernacional
  • BigString
  • Brazzers
  • clave
  • Depositfiles
  • Dotster
  • DynDNS
  • eBay
  • Enom
  • Facebook
  • Fastmail
  • Fileserve
  • Filesonic
  • FLN-Password
  • FLN-UserName
  • Freakshare
  • Gmail
  • GMX
  • Godaddy
  • Hackforums
  • Hotfile
  • IKnowThatGirl
  • Letitbit
  • Live
  • LoginPassword
  • LoginUserName
  • LogMeIn
  • Mediafire
  • Megaupload
  • Moneybookers
  • Moniker
  • Namecheap
  • Netflix
  • Netload
  • NoIP
  • numeroTarjeta
  • OfficeBanking
  • Oron
  • PayPal
  • Runescape
  • Sendspace
  • Sms4file
  • Speedyshare
  • Steam
  • Thepiratebay
  • Torrentleech
  • Twitter
  • Uploaded
  • Uploading
  • Vip-file
  • Webnames
  • Whatcd
  • Yahoo
  • YouPorn
  • YouTube

It blocks users from accessing websites with the following strings:

  • avast.
  • avg.
  • avira.
  • bitdefender.
  • bullguard.
  • clamav.
  • comodo.
  • emsisoft.
  • eset.
  • f-secure.
  • fortinet.
  • garyshood.
  • gdatasoftware.
  • heck.tc
  • iseclab.
  • jotti.
  • kaspersky.
  • lavasoft.
  • malwarebytes.
  • mcafee.
  • norman.
  • norton.
  • novirusthanks.
  • onecare.live.
  • onlinemalwarescanner.
  • pandasecurity.
  • precisesecurity.
  • sophos.
  • sunbeltsoftware.
  • symantec
  • threatexpert.
  • trendmicro.
  • virscan.
  • virus.
  • virusbuster.nprotect.
  • viruschief.
  • virustotal.
  • webroot.

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
  • Perfrom Slowloris, UDP, and SYN flooding
  • Run Reverse Socks4 proxy server
  • Send MSN Messenger messages
  • Steal login credentials
  • Update Itself
  • Visit a website

It may also prevent users from using the following applications:

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

It hooks the following APIs to hide itself and to aid its routines:

  • CopyFileA
  • CopyFileW
  • CreateFileA
  • CreateFileW
  • DeleteFileA
  • DeleteFileW
  • DnsQuery_A
  • DnsQuery_W
  • GetAddrInfoW
  • HttpSendRequestA
  • HttpSendRequestW
  • InternetWriteFile
  • LdrEnumerateLoadedModules
  • LdrGetDllHandle
  • LdrGetProcedureAddress
  • LdrLoadDll
  • MoveFileA
  • MoveFileW
  • NtEnumerateValueKey
  • NtQueryDirectoryFile
  • NtQueryInformationThread
  • NtQueryInformationProcess
  • NtQuerySystemInformation
  • NtQueryVirtualMemory
  • PR_Write
  • RegCreateKeyExA
  • RegCreateKeyExW
  • RtlAnsiStringToUnicodeString
  • URLDownloadToFileW
  • URLDownloadToFileA

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

  • mIRC
  • MSN Messenger

  SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

8.298.06

FIRST VSAPI PATTERN DATE:

19 Jul 2011

VSAPI OPR PATTERN File:

8.299.00

VSAPI OPR PATTERN Date:

20 Jul 2011

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

Scan your computer with your Trend Micro product and note files detected as WORM_DORKBOT.ACC

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Delete this registry value

[ Learn More ]

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

Step 5

Search and delete the file detected as WORM_DORKBOT.ACC

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden files in the search result.

Step 6

Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_DORKBOT.ACC. 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.

Step 7

Scan your computer with your Trend Micro product to delete files detected as WORM_DORKBOT.ACC. 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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