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WORM_GOLROTED.ABAHW

June 04, 2018
 Analysis by: Maureen Reyes
 ALIASES:

Trojan:Win32/Tiggre!rfn (Microsoft), Trojan.Win32.VBKrypt.zcmo (Kaspersky)

 PLATFORM:

Windows

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

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Propagates via flashdrives, Downloaded from the Internet, Dropped by other malware


This Worm arrives by connecting affected removable drives to a system. 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 drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.

It steals sensitive information such as user names and passwords related to certain games.

  TECHNICAL DETAILS

File Size:

839,680 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

26 Feb 2018

Payload:

Drops files, Steals information, Collects system information, Hides files and processes

Arrival Details

This Worm arrives by connecting affected removable drives to a system.

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 Worm drops the following copies of itself into the affected system and executes them:

  • %Application Data%\Windows Update.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 drops the following files:

  • %Application Data%\pid.txt - Process ID of malware
  • %Application Data%\pidloc.txt - Full path of dropped copy where it is executed
  • %User Temp%\Sysinfo.txt - Full path of intial malware copy where it is executed
  • %User Temp%\screens\screenshot{1,2,3...}.jpeg

(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.)

Other System Modifications

This Worm modifies the following registry entries:

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

(Note: The default value data of the said registry entry is "0".)

Propagation

This Worm drops the following copy(ies) of itself in all removable drives:

  • {Removable Drive}:\Sys.exe

It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.

The said .INF file contains the following strings:

[autorun]
open=Sys.exe
action=Run win32

Information Theft

This Worm steals sensitive information such as user names and passwords related to the following games:

  • Steam
  • Minecraft

It gathers the following data:

  • CPU Name
  • Server name
  • Keylogs
  • Clipboard logs
  • Timelogs
  • Local Date and Time
  • Installed language
  • Operating System
  • Internal IP
  • External IP
  • Installed Anti-Virus
  • Installed Firewall
  • Screenshots

It attempts to steal stored email credentials from the following:

  • Internet Account Manager
  • Microsoft Outlook
  • Windows Mail
  • Windows Live Mail
  • IncrediMail
  • Eudora
  • Netscape Messenger
  • MSN Messenger
  • Mozilla Thunderbird
  • Group Mail
  • Yahoo! Mail
  • Gmail
  • Google Desktop
  • Google Talk

It attempts to get stored information such as user names, passwords, and hostnames from the following browsers:

  • Internet Explorer
  • Firefox
  • Google Chrome
  • Chrome SxS
  • Netscape
  • Opera
  • Safari
  • Sea Monkey

Stolen Information

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

  • {BLOCKED}ey.isaac@yandex.com

Other Details

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

  • http://whatismyipaddress.com

It does the following:

  • This worm hides the files dropped in removable drives.
  • It disables the following processes:
    • regedit.exe
    • cmd.exe
    • msconfig.exe
    • taskmgr.exe

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

14.288.04

FIRST VSAPI PATTERN DATE:

01 Jun 2018

VSAPI OPR PATTERN File:

14.289.00

VSAPI OPR PATTERN Date:

02 Jun 2018

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

Identify and terminate files detected as WORM_GOLROTED.ABAHW

[ Learn More ]
  1. Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
  2. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  3. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 4

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 5

Search and delete AUTORUN.INF files created by WORM_GOLROTED.ABAHW that contain these strings

[ Learn More ]
DATA_GENERIC
  • If the lines are present, delete the file.
  • Repeat steps 3 to 6 for the remaining AUTORUN.INF files in other remaining removable drives.
  • Close Search Results.
    • *Note: The file name input box title varies depending on the Windows version (e.g. Search for files or folders named or All or part of the file name.).

    For Windows Vista, Windows 7, Windows Server 2003, Windows 8, Windows 8.1, and Windows Server 2012:

    1. Open a Windows Explorer window.
      • For Windows Vista, 7, and Server 2008 users, click Start>Computer.
      • For Windows 8, 8.1, and Server 2012 users, right-click on the lower left corner of the screen, then click File Explorer.
    2. In the Search Computer/This PC input box, type:
      AUTORUN.INF
    3. Select the file, then open using Notepad.
    4. Check if the following lines are present in the file:
      DATA_GENERIC
    5. If the lines are present, delete the file.
    6. Repeat steps 3 to 5 for the remaining AUTORUN.INF files in other remaining removable drives.
    7. Close Search Results.

    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.
    • %User Temp%\SysInfo.txt
    • %User Temp%\screens\screenshot{1,2,3...}.jpeg
    • %Application Data%\pid.txt
    • %Application Data%\pidloc.txt

    Step 7

    Scan your computer with your Trend Micro product to delete files detected as WORM_GOLROTED.ABAHW. 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 the following Trend Micro Support pages for more information:


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