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BKDR_DRIDEX.YYSSK

November 12, 2016
 Analysis by: Cris Nowell Pantanilla
 ALIASES:

Trojan.Win32.Razy.cid (Kaspersky), Trojan:Win32/Dynamer!ac (Microsoft)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 REPORTED INFECTION:

  • Threat Type: Spyware

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Via email, Downloaded from the Internet

This spyware arrives as an attachment to email messages spammed by other malware/grayware or malicious users. It 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.

  TECHNICAL DETAILS

File Size:

200,704 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

10 Nov 2016

Payload:

Connects to URLs/IPs, Downloads files

Arrival Details

This spyware arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

It 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 adds the following processes:

  • spoolsv.exe

It injects codes into the following process(es):

  • spoolsv.exe

Other Details

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

  • {BLOCKED}.{BLOCKED}.158.54:53443
  • {BLOCKED}.{BLOCKED}.86.72:3443
  • {BLOCKED}.{BLOCKED}.45.29:40443

It does the following:

  • Download configuration files
  • Downloads and executes a file
  • Injects the downloaded file to a process
  • It checks for the presence of the following registry to check if a program is installed:
    • HKEY_LOCAL_MACHINE/SOFTWARE/TrendMicro/Vizor

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

12.890.03

FIRST VSAPI PATTERN DATE:

10 Nov 2016

VSAPI OPR PATTERN File:

12.891.00

VSAPI OPR PATTERN Date:

11 Nov 2016

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

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