Analysis by: Robert Nicole Malagad

ALIASES:

HEUR:Trojan.MSIL.Miner.gen (Kaspersky), MSIL/CoinMiner.AQZ!tr (Fortinet)

 PLATFORM:

Windows

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

  • Threat Type: Coinminer

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Canal de infección Dropped by other malware, Spammed via email

This Coinminer arrives as an attachment to email messages spammed by other malware/grayware or malicious users. It arrives as a component bundled with malware/grayware packages.

  TECHNICAL DETAILS

Tamaño del archivo 1,976,673 bytes
Tipo de archivo EXE
Residente en memoria Yes
Fecha de recepción de las muestras iniciales 05 Sep 2018
Carga útil Drops files, Connects to URLs/IPs

Arrival Details

This Coinminer arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

It arrives as a component bundled with malware/grayware packages.

Installation

This Coinminer drops and executes the following files:

  • %User Temp%\zip.exe ← Coinminer.MSIL.MALXMR.THAOODAH
  • %User Temp%\leer.vbs ← Worm.VBS.Dunihi.TVP
  • %User Temp%\Tv-Plug-In.exe
  • %User Temp%\__tmp_rar_sfx_access_check_36139816
  • %User Temp%\iisfcgi.dll
  • %User Temp%\iisfreb.dll
  • %User Temp%\iisreqs.dll
  • %User Temp%\iisres.dll
  • %User Temp%\iisRtl.dll
  • %User Temp%\iisutil2.dll
  • %User Temp%\iisvermg.dll
  • %User Temp%\iiswsock.dll
  • %User Temp%\iprestr.dll
  • %User Temp%\browscap.ini
  • %User Temp%\iisexpress.exe
  • %User Temp%\IisExpressAdminCmd.exe
  • %User Temp%\iisexpresstray.exe
  • %User Temp%\authanon.dll
  • %User Temp%\authbas.dll
  • %User Temp%\authcert.dll
  • %User Temp%\authmap.dll
  • %User Temp%\authsspi.dll
  • %User Temp%\browscap.dll
  • %User Temp%\cachtokn.dll
  • %User Temp%\IisExpressadminCmd.resources.dll
  • %User Temp%\iisexpresshelper.dll
  • %User Temp%\iisexpresstray.dll
  • %User Temp%\IisExpressAdminCmd.exe.config
  • %User Temp%\iisexpress.exe.manifest
  • %User Temp%\iisexpressshim.sdb
  • %User Temp%\nsb78C8.tmp\welcome.bmp
  • %User Temp%\nsb78C8.tmp\header.bmp
  • %User Temp%\nsb78C8.tmp\Eula.txt
  • %User Temp%\nsb78C8.tmp\nsDialogs.dll
  • %User Temp%\nsb78C8.tmp\System.dll
  • %User Startup%\leer.vbs ← Worm.VBS.Dunihi.TVP

It adds the following processes:

  • %System%\WScript.exe "%User Temp%\leer.vbs"
  • %User Temp%\zip.exe

(Note: %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.)

  SOLUTION

Motor de exploración mínimo 9.850
Primer archivo de patrones de VSAPI 14.542.03
Primera fecha de publicación de patrones de VSAPI 03 Oct 2018
Versión de patrones OPR de VSAPI 14.543.00
Fecha de publicación de patrones OPR de VSAPI 04 Oct 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

Restart in Safe Mode

[ Learn More ]

Step 4

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.
  • %User Temp%\__tmp_rar_sfx_access_check_36139816
  • %User Temp%\Tv-Plug-In.exe
  • %User Temp%\zip.exe
  • %User Temp%\leer.vbs
  • %User Temp%\iisfcgi.dll
  • %User Temp%\iisfreb.dll
  • %User Temp%\iisreqs.dll
  • %User Temp%\iisres.dll
  • %User Temp%\iisRtl.dll
  • %User Temp%\iisutil2.dll
  • %User Temp%\iisvermg.dll
  • %User Temp%\iiswsock.dll
  • %User Temp%\iprestr.dll
  • %User Temp%\browscap.ini
  • %User Temp%\iisexpress.exe
  • %User Temp%\IisExpressAdminCmd.exe
  • %User Temp%\iisexpresstray.exe
  • %User Temp%\authanon.dll
  • %User Temp%\authbas.dll
  • %User Temp%\authcert.dll
  • %User Temp%\authmap.dll
  • %User Temp%\authsspi.dll
  • %User Temp%\browscap.dll
  • %User Temp%\cachtokn.dll
  • %User Temp%\IisExpressadminCmd.resources.dll
  • %User Temp%\iisexpresshelper.dll
  • %User Temp%\iisexpresstray.dll
  • %User Temp%\IisExpressAdminCmd.exe.config
  • %User Temp%\iisexpress.exe.manifest
  • %User Temp%\iisexpressshim.sdb
  • %User Temp%\nsb78C8.tmp\welcome.bmp
  • %User Temp%\nsb78C8.tmp\header.bmp
  • %User Temp%\nsb78C8.tmp\Eula.txt
  • %User Temp%\nsb78C8.tmp\nsDialogs.dll
  • %User Temp%\nsb78C8.tmp\System.dll
  • %User Startup%\leer.vbs

Step 5

Restart in normal mode and scan your computer with your Trend Micro product for files detected as COINMINER.WIN32.TEVEPLUGS.THAOODAH. 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.


Did this description help? Tell us how we did.