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TrojanSpy.Win32.DRIDEX.TIAOABAZ

October 27, 2019
 Analysis by: John Donnie Celestre
 ALIASES:

Gen:Variant.Razy.569182 (BITDEFENDER)

 PLATFORM:

Windows

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

  • Threat Type: Trojan Spy

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW


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

It scans the computer for registry keys related to antivirus and security applications. This action allows the malware to possibly avoid detection in the computer.

It connects to a website to send and receive information.

  TECHNICAL DETAILS

File Size:

237,568 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

17 Oct 2019

Arrival Details

This Trojan Spy 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 Trojan Spy adds the following processes:

  • %System%\whoami.exe /all
  • %System%\net.exe view
  • %System%\raserver.exe "{malware path and filename}"

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

It injects codes into the following process(es):

  • %System%\raserver.exe

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

Other System Modifications

This Trojan Spy scans the system for the following registry keys, which are related to antivirus and security applications:

HKEY_LOCAL_MACHINE\Software\TrendMicro
Vizor =

Backdoor Routine

This Trojan Spy connects to the following websites to send and receive information:

  • 194.{BLOCKED}.{BLOCKED}.198
  • 176.{BLOCKED}.{BLOCKED}.143
  • 195.{BLOCKED}.{BLOCKED}6.1

Information Theft

This Trojan Spy gathers the following data:

  • Running Processes
  • Computer Username
  • Installed Applications
  • Process Memory Information
  • Related System Information:
    • Build GUID
    • Build Lab
    • Build Lab Ex
    • CSD Build Number
    • CSD Version
    • Current Build Number
    • Current Type
    • Current Version
    • Digital Product ID
    • Edition ID
    • Install Date
    • Installation Type
    • OS Version
    • Path Name
    • Product ID
    • Product Name
    • Registered Organization
    • Registered Owner
    • Software Type
    • System Root

Other Details

This Trojan Spy does the following:

  • checks for the existence of %System Root%\testapp.exe

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

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

15.454.08

FIRST VSAPI PATTERN DATE:

26 Oct 2019

VSAPI OPR PATTERN File:

15.455.00

VSAPI OPR PATTERN Date:

27 Oct 2019

Step 1

Trend Micro products with the XGen technology detect this malware as

[ Learn More ]
Troj.Win32.TRX.XXPE50FFF032

Step 2

Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.

Step 3

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 4

Restart in Safe Mode

[ Learn More ]

Step 5

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.
  • %System Root%\testapp.exe

Step 6

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TrojanSpy.Win32.DRIDEX.TIAOABAZ. 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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