1. Symantec/
  2. Security Response/
  3. Trojan.Smoaler


Risk Level 1: Very Low

October 5, 2011
October 5, 2011 3:29:38 PM
Infection Length:
Systems Affected:
When the Trojan is executed, it copies itself as the following file:

It then creates the following registry entries so that it runs every time Windows starts:
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\"[NAME VARIES]" = "%UserProfile%\Application Data\csrss.exe"
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\"[NAME VARIES]" = "%UserProfile%\Application Data\csrss.exe"

Note: The following are examples of [NAME VARIES]:
  • Classes
  • Netscape
  • ODBC
  • WinRAR
  • Policies
  • Intel

Next, it downloads XOR-encoded .dll files from one of the following URLs:
  • [http://]pgdigital.org/inde[REMOVED]
  • [http://]pgdigital.org/inde[REMOVED]

It then decodes the files, creates an instance of svchost.exe, and injects the files into that process.

The Trojan collects information regarding Protected Storage Objects, user names, passwords, history, and configuration files for the following types of software:

FTP clients:
  • Far Manager
  • Total Commander
  • WS_FTP
  • CuteFTP,
  • FLashFXP
  • FileZilla
  • FTP Commander
  • BulletProof FTP
  • SmartFTP
  • TurboFTP
  • CoffeeCup FTP
  • CoreFTP
  • FTP Explorer
  • Frigate3
  • SecureFX
  • UltraFXP
  • FTPRush
  • Web Site Publisher
  • BitKinex
  • ExpanDrive
  • Classic FTP
  • Fling
  • SoftX
  • Directory Opus
  • FTPUploader
  • FreeFTP
  • LeapFTP
  • WinSCP
  • 32bit FTP
  • WebDrive
  • FTP Control
  • NetDrive
  • Windows Commander

Instant messaging applications:
  • ICQ
  • Miranda
  • &RQ
  • Trillian
  • MSN Messenger
  • Yahoo! Instant Messenger
  • AIM
  • Gaim
  • Quiet Internet Pager
  • Odigo Messenger
  • IM2 Instant Messenger
  • Sim Instant Messenger
  • Google Talk
  • Psi
  • FAIM
  • MySpace Instant Messenger
  • Windows Live Messenger
  • Paltalk
  • Excite Private Messenger
  • Gizmo
  • Pidgin
  • AIM Pro
  • Pandion
  • Social Network Messenger
  • Jabber
  • Digsby
  • Vypress Auvis

RAS dialers:
  • EType Dialer
  • Muxasoft Dialer
  • Flexiblesoft Dialer
  • DialerQueen
  • VDialer

Download managers:
  • Download Master
  • Internet Download Accelerator
  • GetRight
  • FlashGet

Online poker games:
  • Full Tilt Poker
  • PokerStars
  • Titan Poker
  • PartyPoker
  • Cake Poker
  • Absolute Poker
  • UB Poker
  • 888Poker

Web browsers:
  • Internet Explorer
  • Firefox
  • Safari
  • Chrome
  • Flock
  • SeaMonkey
  • Opera

Email clients:
  • Thunderbird
  • The Bat
  • Outlook
  • Eudora
  • Gmail
  • Incredimail
  • Groupmail Free
  • Pocomail
  • Fort√© Agent
  • POP Peeper
  • Mail Commander
  • Windows Mail
  • Becky!
  • Mail.ru Agent

The Trojan may also access the following URLs:
  • [http://][HOST]/inde[REMOVED]
  • [http://][HOST]/inde[REMOVED]

Note: [HOST] is one of the following domains:
  • pgdigital.org
  • www.kumatoznik.ru
  • nugromilzek.ru
  • suledinezo.ru
  • mudfenilso.ru
  • hutovodnic.ru

It may also access the following domains:
  • www.mijnhemubo.nl
  • www.google.com

The Trojan then opens a TCP port and may accept commands on this port.


Symantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":

  • Use a firewall to block all incoming connections from the Internet to services that should not be publicly available. By default, you should deny all incoming connections and only allow services you explicitly want to offer to the outside world.
  • Enforce a password policy. Complex passwords make it difficult to crack password files on compromised computers. This helps to prevent or limit damage when a computer is compromised.
  • Ensure that programs and users of the computer use the lowest level of privileges necessary to complete a task. When prompted for a root or UAC password, ensure that the program asking for administration-level access is a legitimate application.
  • Disable AutoPlay to prevent the automatic launching of executable files on network and removable drives, and disconnect the drives when not required. If write access is not required, enable read-only mode if the option is available.
  • Turn off file sharing if not needed. If file sharing is required, use ACLs and password protection to limit access. Disable anonymous access to shared folders. Grant access only to user accounts with strong passwords to folders that must be shared.
  • Turn off and remove unnecessary services. By default, many operating systems install auxiliary services that are not critical. These services are avenues of attack. If they are removed, threats have less avenues of attack.
  • If a threat exploits one or more network services, disable, or block access to, those services until a patch is applied.
  • Always keep your patch levels up-to-date, especially on computers that host public services and are accessible through the firewall, such as HTTP, FTP, mail, and DNS services.
  • Configure your email server to block or remove email that contains file attachments that are commonly used to spread threats, such as .vbs, .bat, .exe, .pif and .scr files.
  • Isolate compromised computers quickly to prevent threats from spreading further. Perform a forensic analysis and restore the computers using trusted media.
  • Train employees not to open attachments unless they are expecting them. Also, do not execute software that is downloaded from the Internet unless it has been scanned for viruses. Simply visiting a compromised Web site can cause infection if certain browser vulnerabilities are not patched.
  • If Bluetooth is not required for mobile devices, it should be turned off. If you require its use, ensure that the device's visibility is set to "Hidden" so that it cannot be scanned by other Bluetooth devices. If device pairing must be used, ensure that all devices are set to "Unauthorized", requiring authorization for each connection request. Do not accept applications that are unsigned or sent from unknown sources.
  • For further information on the terms used in this document, please refer to the Security Response glossary.
Writeup By: Fergal Ladley
Summary| Technical Details| Removal

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