Analysis by: Francis Xavier Antazo

ALIASES:

Win32/Elsentric.C trojan (NOD32), W32/Elsentric.C!tr (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

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 requires its main component to successfully perform its intended routine.

  TECHNICAL DETAILS

File Size: 77,312 bytes
File Type: DLL
Memory Resident: Yes

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:

  • {malware path}\{random file name}.cab

Other Details

This backdoor connects to the following possibly malicious URL:

  • {BLOCKED}.{BLOCKED}.237.59/{random characters}/page_{random characters}.html
  • www.{BLOCKED}hoahau.com/{random characters}/page_{random characters}.html

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

  SOLUTION

Minimum Scan Engine: 9.700
FIRST VSAPI PATTERN FILE: 9.864.09
FIRST VSAPI PATTERN DATE: 18 Apr 2013
VSAPI OPR PATTERN File: 9.865.00
VSAPI OPR PATTERN Date: 19 Apr 2013

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

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.  
  • {malware path}\{random file name}.cab

Step 3

Scan your computer with your Trend Micro product to delete files detected as BKDR_ESILE.SMDL. 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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