Analysis by: Sammy Chua
 Modified by: Homer Pacag

 ALIASES:

TrojanDownloader:Win32/Drixed (Microsoft)

 PLATFORM:

Windows

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

  • Threat Type: Spyware

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

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

This malware is related to the DRIDEX spam runs that used financial matters as its social engineering ploy. These spam emails have Word and Excel file documents which contain the macro that downloads DRIDEX.

To get a one-glance comprehensive view of the behavior of this Spyware, refer to the Threat Diagram shown below.

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

It connects to certain websites to send and receive information. It gathers information and reports it to its servers.

  TECHNICAL DETAILS

File Size: 335,360 bytes
Memory Resident: Yes
Initial Samples Received Date: 18 Nov 2015
Payload: Compromises system security, Steals information

Arrival Details

This spyware 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 spyware injects codes into the following process(es):

  • explorer.exe

Other Details

This spyware connects to the following website to send and receive information:

  • {BLOCKED}.{BLOCKED}.35.56:8843
  • {BLOCKED}.{BLOCKED}.71.148:8843
  • {BLOCKED}.{BLOCKED}.220.146:4438
  • {BLOCKED}.{BLOCKED}.66.169:7447
  • {BLOCKED}.{BLOCKED}.180.195:4493

It does the following:

  • httpshots
  • form grabbing
  • clickshots
  • site injections

The configuration file may contain URLs that it access to download an updated copy of itself and to send its gathered information.

It gathers the following information and reports it to its servers:

  • Computer Name
  • User Name
  • Date Installed
  • OS Version
  • Running Privilege

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 12.158.04
FIRST VSAPI PATTERN DATE: 18 Nov 2015
VSAPI OPR PATTERN File: 12.159.00
VSAPI OPR PATTERN Date: 18 Nov 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

Scan your computer with your Trend Micro product to delete files detected as TSPY_DRIDEX.YJL. 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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