TSPY_GOLROTED.AUSSOO

June 01, 2018
 Analysis by: Carl Maverick Pascual
 ALIASES:

HEUR:Trojan.MSIL.Generic (Kaspersky) ; a variant of MSIL/Kryptik.JXI (ESET-Nod32)

 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 as an attachment to email messages mass-mailed by other malware/grayware or malicious users.

It retrieves specific information from the affected system.

  TECHNICAL DETAILS

File Size:

643,072 bytes

File Type:

EXE

Memory Resident:

Yes

Arrival Details

This Trojan Spy arrives as an attachment to email messages mass-mailed by other malware/grayware or malicious users.

Installation

This Trojan Spy drops the following files:

  • %Application Data%\Microsoft\Windows\WdiService\Filename.lnk
  • %Application Data%\Microsoft\Windows\WdiService\fl.txt
  • %Application Data%\Microsoft\Windows\WdiService\{hex values}.txt
  • %Application Data%\pidloc.txt -> contains the file path of the malware.
  • %Application Data%\pid.txt -> ProcessID of the malware
  • %User Temp%\uyaka v.exe -> Detected as TSPY_MSILOG.SM
  • %User Temp%\holdermail.txt -> deleted afterwards
  • %User Temp%\holderwb.txt -> deleted afterwards

(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

It drops the following copies of itself into the affected system:

  • %Application Data%\Microsoft\Windows\WdiService\Filename.exe

(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

It adds the following processes:

  • %User Temp%\uyaka v.exe
  • %Application Data%\Microsoft\Windows\WdiService\Filename.exe
  • "{.Net installtion folder}\vbc.exe /stext "%User Temp%\holderwb.txt"
  • "{.Net installtion folder}\vbc.exe /stext "%User Temp%\holdermail.txt"
  • {.Net Installation Folder}\RegSvcs.exe

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

It injects codes into the following process(es):

  • {.Net Installation Folder}\RegSvcs.exe

Other System Modifications

This Trojan Spy modifies the following registry entries to hide files with Hidden attributes:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
Hidden = 1

Information Theft

This Trojan Spy retrieves the following information from the affected system:

  • Computer Name
  • Local Date And Time
  • Installed Language
  • .Net Version
  • Operating System Platform
  • Operating System Version
  • Installed Antivirus
  • Installed Firewall
  • Firewall Product
  • External IP Address
  • Internal IP Address
  • Account Information from:
  • Bitcoin
  • Minecraft
  • Internet Download Manager
  • jDownloader

It attempts to steal stored email credentials from the following:

  • Mozilla Thunderbird
  • Eudora
  • Internet Account Manager
  • MS Outlook
  • IncrediMail
  • Group Mail
  • Yahoo! Mail
  • Windows Mail
  • Windows Live Mail
  • Gmail

Stolen Information

This Trojan Spy sends the data it gathers to the following email addresses via SMTP:

  • {BLOCKED}klia@ze{BLOCKED}roups.net

Other Details

This Trojan Spy connects to the following URL(s) to get the affected system's IP address:

  • http://checkip.dyndns.org
  • http://whatismyipaddress.com

It does the following:

  • It attempts to steal stored account credentials from the following Instant Messaging applications:
    • Google Talk
    • MSN Messenger
    • Messenger Service

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

13.538.05

FIRST VSAPI PATTERN DATE:

17 Jul 2017

VSAPI OPR PATTERN File:

13.539.00

VSAPI OPR PATTERN Date:

18 Jul 2017

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

Restart in Safe Mode

[ Learn More ]

Step 4

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

 
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce
    • Load = %Application Data%\Microsoft\Windows\WdiService\Filename.lnk

Step 5

Restore this modified registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
    • From: Hidden = 1
      To: Hidden = "0"

Step 6

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.
  • %Application Data%\Microsoft\Windows\WdiService\Filename.exe
  • %Application Data%\Microsoft\Windows\WdiService\Filename.lnk
  • %Application Data%\Microsoft\Windows\WdiService\fl.txt
  • %Application Data%\Microsoft\Windows\WdiService\{hex values}.txt
  • %Application Data%\pidloc.txt
  • %Application Data%\pid.txt
  • %User Temp%\uyaka v.exe

Step 7

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