Analysis by: Homer Pacag

ALIASES:

Backdoor:Win32/Bioazih.A!dha (Microsoft); W32/Dorifel.XAG!tr (Fortinet);

 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.

It deletes itself after execution.

  TECHNICAL DETAILS

File Size: 208,798 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 24 Jul 2012

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:

  • %Program Files%Common Files\Бланк_нов.jpg
  • %Windows%\Temp\conime.exe
  • %Windows%\Temp\k.reg
  • {Malware Path}\Бланк_нов.jpg

(Note: %Program Files% is the Program Files folder, where it usually is C:\Program Files on all Windows operating system versions; C:\Program Files (x86) for 32-bit applications running on Windows 64-bit operating systems.. %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)

It drops and executes the following files:

  • %Program Files%\Common Files\config.exe

(Note: %Program Files% is the Program Files folder, where it usually is C:\Program Files on all Windows operating system versions; C:\Program Files (x86) for 32-bit applications running on Windows 64-bit operating systems.)

Autostart Technique

This Trojan creates the following registry entries to enable automatic execution of dropped component at every system startup:

HKCU\Software\Microsoft\
Windows\CurrentVersion\Run
conime.exe = %System%\temp\conime.exe

Other Details

This Trojan connects to the following possibly malicious URL:

  • {BLOCKED}r.{BLOCKED}w.us/ru/ya/htp.asp
  • {BLOCKED}e.{BLOCKED}4.com/0615/%43%4e%6d/art/porth.asp
  • {BLOCKED}r.{BLOCKED}w.us/ru/ya/htp.asp
  • {BLOCKED}e.{BLOCKED}w.us/0615/%43%4e%6d/art/porth.asp
  • {BLOCKED}e.{BLOCKED}4.com/0615/%43%4e%6d/art/porth.asp

It deletes itself after execution.

  SOLUTION

Minimum Scan Engine: 9.750
VSAPI OPR PATTERN File: 9.283.00
VSAPI OPR PATTERN Date: 24 Jul 2012
OPP PATTERN File: 9.284.00
OPP PATTERN Date: 24 Jul 2012

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

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
    • conime.exe = %System%\temp\conime.exe

Step 4

Search and delete this file

[ 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.
  • %Program Files%\Common Files\config.exe
  • %Program Files%\Common Files\Бланк_нов.jpg
  • %Windows%\Temp\conime.exe
  • %Windows%\Temp\k.reg
  • {Malware Path}\Бланк_нов.jpg

Step 5

Scan your computer with your Trend Micro product to delete files detected as TROJ_DRPBEAT.SMA. 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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