Modified by: Jaime Benigno Reyes
 PLATFORM:

Windows

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: Dropped by other malware, Downloaded from the Internet

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 executes commands from a remote malicious user, effectively compromising the affected system.

  TECHNICAL DETAILS

File Size: 39,936 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 07 Jun 2014
Payload: Gathers data

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.

Backdoor Routine

This backdoor executes the following commands from a remote malicious user:

  • WINCMD - perform remote command shell
  • TASKKILL - terminate a certain process
  • SHUTDOWN - terminate itself
  • SLEEP - sleep for a specified time
  • PUTFILE - download arbitrary file

Information Theft

This backdoor gathers the following data:

  • computer name
  • user name
  • operating system version

NOTES:

It gets the IP address of the following site:

  • {BLOCKED}ra.googlesale.net

It generates a new IP address by switching the numbers of the acquired IP address:

  • Original IP Address = {1st number}.{2nd number}.{3rd number}.{4th number}
  • New IP Address = {2nd number}.{3rd number}.{4th number}.{1st number}

It connects to the following URL to send the gathered information and receive commands from a remote malicious user:

  • {New IP Address}:443

As of this writing, there is no response from the generated new IP address.

  SOLUTION

Minimum Scan Engine: 9.700
FIRST VSAPI PATTERN FILE: 10.846.03
FIRST VSAPI PATTERN DATE: 07 Jun 2014
VSAPI OPR PATTERN File: 10.847.00
VSAPI OPR PATTERN Date: 08 Jun 2014

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 to delete files detected as BKDR_WINCODA.A. 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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