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BKDR_CINAS.DUK

June 18, 2015
 Analysis by: Adrian Cofreros
 Modified by: Ryan Gardo
 ALIASES:

Trojan-Downloader.Win32.Small!cobra (v)(AVware); Backdoor:Win32/Cinasquel.A(Microsoft); W32/Dloader.AC(Fortinet)

 PLATFORM:

Windows

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware

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

It gathers certain information on the affected computer.

It requires its main component to successfully perform its intended routine.

  TECHNICAL DETAILS

File Size:

3,584 bytes

File Type:

DLL

Memory Resident:

Yes

Initial Samples Received Date:

15 Jan 2013

Payload:

Connects to URLs/IPs, Downloads files

Arrival Details

This backdoor 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 backdoor drops the following files:

  • %Windows%\v3.log

(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)

Other System Modifications

This backdoor adds the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control\Terminal Server\WinStations\
RDP-Tcp

Download Routine

This backdoor saves the files it downloads using the following names:

  • %Temp%\isetup.exe

(Note: %Temp% is the Windows temporary folder, where it usually is C:\Windows\Temp on all Windows operating system versions.)

Information Theft

This backdoor gathers the following information on the affected computer:

  • OS Version

Other Details

This backdoor requires its main component to successfully perform its intended routine.

NOTES:

It adds the following user accounts to the Administrator group:

  • piress

This file accepts a URL as a parameter and downloads it to the mentioned file above and executes it.

  SOLUTION

Minimum Scan Engine:

9.750

FIRST VSAPI PATTERN FILE:

9.658.03

FIRST VSAPI PATTERN DATE:

16 Jul 2012

VSAPI OPR PATTERN File:

9.659.00

VSAPI OPR PATTERN Date:

17 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

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.
  • %Temp%\isetup.exe
  • %Windows%\v3.log

Step 5

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