TROJ_GOLROTED.AUSSOO

August 04, 2018
 Analysis by: Kiyoshi Obuchi
 ALIASES:

Infostealer.Viwir (Symantec); Trojan:Win32/Tiggre!plock (Microsoft)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

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

  TECHNICAL DETAILS

File Size:

5,216,096 bytes

File Type:

EXE

Initial Samples Received Date:

25 Jul 2018

Arrival Details

This Trojan 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 drops the following files:

  • %Application Data%\Local\4Adobe\4low\7922.jpg
  • %Application Data%\Local\4Adobe\4low\870.afr
  • %Application Data%\Local\4Adobe\4low\adbr01.ght
  • %Application Data%\Local\4Adobe\4low\adbr02.ght
  • %Application Data%\Local\4Adobe\4low\Adobeta.exe
  • %Application Data%\Local\4Adobe\4low\aijw01.bat
  • %Application Data%\Local\4Adobe\4low\BReader.exe
  • %Application Data%\Local\4Adobe\4low\ggerig02.bat
  • %Application Data%\Local\4Adobe\4low\ggerig03.bat
  • %Application Data%\Local\4Adobe\4low\nimiki09.vbs
  • %Application Data%\Local\4Adobe\4low\sun.afr
  • %Application Data%\Local\4Adobe\4low\ZREA.vbs
  • %Application Data%\Adobe\Adobe INC\AadobeRead\7922.jpg
  • %Application Data%\Adobe\Adobe INC\AadobeRead\870.afr
  • %Application Data%\Adobe\Adobe INC\AadobeRead\adbr01.exe
  • %Application Data%\Adobe\Adobe INC\AadobeRead\adbr02.exe
  • %Application Data%\Adobe\Adobe INC\AadobeRead\Adobeta.exe
  • %Application Data%\Adobe\Adobe INC\AadobeRead\aijw01.bat
  • %Application Data%\Adobe\Adobe INC\AadobeRead\BReader.exe
  • %Application Data%\Adobe\Adobe INC\AadobeRead\ggerig02.bat
  • %Application Data%\Adobe\Adobe INC\AadobeRead\ggerig03.bat
  • %Application Data%\Adobe\Adobe INC\AadobeRead\nimiki09.vbs
  • %Application Data%\Adobe\Adobe INC\AadobeRead\sun.afr
  • %Application Data%\Adobe\Adobe INC\AadobeRead\ZREA.vbs
  • %Application Data%\Adobe\Adobe INC\AadobeRead\adip2.klc
  • %User Temp%\51E748D3.TMP

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, and 8.. %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, and 8.)

Autostart Technique

This Trojan creates the following registry entries to enable automatic execution of dropped component at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
miszzy = %Application Data%\Adobe\Adobe Inc\AdobeRead\aijw01.bat

Other Details

This Trojan connects to the following possibly malicious URL:

  • ftp.{BLOCKED}stia.com