Analysis by: Ryan Gardo
 Modified by: Homer Pacag
ALIASES:

Trojan-Downloader.Win32.Cabby.cemx(Kaspersky), Downloader.Ponik!gen9(Symantec), Kryptik.PDB(Norman)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

  TECHNICAL DETAILS

File Size: 69,632 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 15 Apr 2015

Arrival Details

This Trojan 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 Trojan drops the following files:

  • %User Temp%\{random filename1}.cab
  • %User Temp%\{random filename2}.exe - detected as TROJ_CRYPCTB.YVU
  • %User Temp%\{malware filename}.rtf

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp 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.)

Information Theft

This Trojan attempts to steal stored account information used in the following installed File Transfer Protocol (FTP) clients or file manager software:

  • FlashFXP 4
  • Frigate3
  • FTP Commander
  • FTP Explorer
  • FTP Navigator
  • FTP Rush
  • FTPDisk
  • FTPGetter
  • FTPNow
  • FTPRush
  • FTPVoyager
  • Ghisler
  • Ipswitch WS_FTP
  • LeapFTP
  • LeechFTP
  • LinasFTP
  • NetDrive
  • NetSarang
  • Nico Mak Computing WinZip FTP
  • NovaFTP
  • NppFTP
  • PuTTY
  • QCToolbar Software
  • RhinoSoft
  • Robo-FTP 3.7
  • SecureFX
  • SmartFTP
  • Staff-FTP
  • Total Commander
  • TurboFTP
  • UltraFXP
  • WinFTP
  • 3D-FTP
  • AceBIT
  • ALFTP
  • Bear Share
  • BitKinex
  • BlazeFTP
  • BulletProof Software
  • ClassicFTP
  • CoffeeCup Software
  • COREFTP
  • CuteFTP
  • CuteFTP 6 Home
  • CuteFTP 6 Professional
  • CuteFTP 7 Home
  • CuteFTP 7 Professional
  • CuteFTP 8 Home
  • CuteFTP 8 Professional
  • CuteFTP 9
  • CuteFTP Lite
  • CuteFTP Pro
  • Cyberduck
  • DeluxeFTP
  • Directory Opus
  • EasyFTP
  • ExpanDrive
  • FastTrack
  • FFFTP
  • FileZilla
  • FlashFXP 3

It gathers the following account information from any of the mentioned File Transfer Protocol (FTP) clients or file manager software:

  • Directory list
  • Password
  • Port Number
  • Server Name
  • Server Type
  • User Name

It attempts to steal stored email credentials from the following:

  • IncrediMail
  • Outlook
  • Pocomail Software
  • RimArts
  • Thunderbird
  • Windows Live Mail
  • BatMail
  • Yandex

It attempts to get stored information such as user names, passwords, and hostnames from the following browsers:

  • Chrome
  • ChromePlus
  • Chromium
  • FlashPeak
  • Flock
  • Internet Explorer
  • K-Meleon
  • Mozilla Firefox
  • Opera
  • SeaMonkey
  • RockMelt
  • Bromium

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://http://{BLOCKED}oep.nl/images/efax.jpg
  • http://{BLOCKED}s1vc.altervista.org/listini/efax.jpg
  • http://{BLOCKED}beraffair.org.au/wp-content/efax.jpg
  • http://{BLOCKED}nwijhe92.nl/diversen/efax.jpg
  • http://{BLOCKED}mpex.de/system/efax.jpg
  • http://{BLOCKED}extric.hostei.com/pub/efax.jpg
  • http://{BLOCKED}swebservices.com/testing/efax.jpg
  • http://{BLOCKED}olochef.com/wp-content/efax.jpg
  • http://www.a{BLOCKED}ente4u.eu/aglextra/efax.jpg
  • http://{BLOCKED}andstares.co.uk/docs/efax.jpg

It opens the following files:

  • %User Temp%\{malware filename}.rtf

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp 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.)

  SOLUTION

Minimum Scan Engine: 9.750
FIRST VSAPI PATTERN FILE: 11.610.06
FIRST VSAPI PATTERN DATE: 15 Apr 2015
VSAPI OPR PATTERN File: 11.611.00
VSAPI OPR PATTERN Date: 16 Apr 2015

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

[ Learn More ]

Step 4

Search and delete these files

[ Learn More ]
There may be some files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.  
  • %User Temp%\{random filename1}.cab
  • %User Temp%\{random filename2}.exe
  • %User Temp%\{malware filename}.rtf

Step 5

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