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WORM_GOLROTED.ABAHJ

February 05, 2018
 Analysis by: Marcus Ma. Antonio Capistrano
 ALIASES:

TrojanSpy:MSIL/Golroted.E(Microsoft), TR/Dropper.MSIL.lepmw(ANTIVIR)

 PLATFORM:

Windows

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

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


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

It uses Windows Task Scheduler to create a scheduled task that executes the dropped copy.

  TECHNICAL DETAILS

File Size:

986,112 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

31 Jan 2018

Arrival Details

This Worm 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 files:

  • %User Temp%\SysInfo.txt
  • %User Temp%\Windows Update.txt
  • %AppDataLocal%\GDIPFONTCACHEV1.DAT
  • %System%\Tasks\Update\Windows Update
  • %User Temp%\{random number}.xml
  • %User Temp%\{random number}.xml
  • %User Temp%\{random number}.xml
  • %User Temp%\{random number}.xml
  • %User Temp%\{random number}.xml
  • %User Temp%\{random number}.xml

(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.. %AppDataLocal% is the Application Data folder found in Local Settings, where it is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local 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.. %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

It uses Windows Task Scheduler to create a scheduled task that executes the dropped copy.

It drops copies of itself into folders whose names contain the following strings:

  • %Application Data%\Windows Update.exe
  • %Application Data%\WindowsUpdate.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.)

Autostart Technique

This Worm drops the following file(s) in the Windows User Startup folder to enable its automatic execution at every system startup:

  • %User Startup%\winlogs.exe

(Note: %User Startup% is the current user's Startup folder, which is usually C:\Documents and Settings\{user}\Start Menu\Programs\Startup on Windows 2000 and XP, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows Vista, 7, and 8.)

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

13.940.05

FIRST VSAPI PATTERN DATE:

01 Feb 2018

VSAPI OPR PATTERN File:

13.941.00

VSAPI OPR PATTERN Date:

02 Feb 2018

Step 1

Identify and terminate files detected as WORM_GOLROTED.ABAHJ

[ 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 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

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 Startup%\winlogs.exe
  • %Application Data%\Windows Update.exe
  • %Application Data%\WindowsUpdate.exe
  • %User Temp%\SysInfo.txt
  • %User Temp%\Windows Update.txt
  • %AppDataLocal%\GDIPFONTCACHEV1.DAT
  • %System%\Tasks\Update\Windows Update
  • %User Temp%\{random number}.xml
  • %User Temp%\{random number}.xml
  • %User Temp%\{random number}.xml
  • %User Temp%\{random number}.xml
  • %User Temp%\{random number}.xml
  • %User Temp%\{random number}.xml

Step 4

Scan your computer with your Trend Micro product to delete files detected as WORM_GOLROTED.ABAHJ. 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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