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Worm.AutoIt.OTORUN.AE

January 18, 2020
 ALIASES:

Trojan:Win32/Malex.gen!E [generic] [non_writable_container] (Microsoft); Generic.dbq (McAfee); W32.SillyFDC (Symantec); Trojan.Win32.Generic!BT (Sunbelt)

 PLATFORM:

Windows

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

  • 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.

  TECHNICAL DETAILS

File Size:

295,936 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

18 Jan 2020

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.

Other System Modifications

This Worm adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Run
system starter = "%System Root%\Noveau Dossier.exe"

Dropping Routine

This Worm drops the following files:

  • %User Profile%\Autorun.ini
  • D:\Autorun.inf
  • E:\Nouveau Dossier.exe
  • G:\stuxPC.exe
  • E:\Autorun.inf
  • D:\stuxPC.exe
  • G:\Nouveau Dossier.exe
  • D:\Nouveau Dossier.exe
  • F:\Autorun.inf
  • E:\stuxPC.exe
  • %System Root%\Autorun.inf
  • G:\Autorun.inf
  • %System Root%\stuxPC.exe
  • %User Startup%\svchost.exe
  • %User Temp%\stuxPC.exe
  • F:\Nouveau Dossier.exe
  • %System Root%\Nouveau Dossier.exe
  • %System Root%\Users\Public\Documents\Nouveau Dossier.exe
  • %Windows%\stuxPC.exe
  • %Application Data%\Nouveau Dossier.exe
  • %User Profile%\Documents\Nouveau Dossier.exe
  • F:\stuxPC.exe
  • %Windows%\SysWOW64\stuxPC.exe
  • %All Users Profile%\Microsoft\Windows\Start Menu\Programs\Startup\svchost.exe

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name} on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.. %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows 2003(32-bit), XP and 2000(32-bit), or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit), 10(64-bit).. %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.. %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %All Users Profile% is the common user's profile folder, which is usually C:\Documents and Settings\All Users on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\ProgramData on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit). )

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.850

Step 1

Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.

Step 2

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_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run
    • system starter = "%System Root%\Noveau Dossier.exe"

Step 3

Search and delete these components

[ Learn More ]
There may be some components 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 Profile%\Autorun.ini
  • D:\Autorun.inf
  • E:\Nouveau Dossier.exe
  • G:\stuxPC.exe
  • E:\Autorun.inf
  • D:\stuxPC.exe
  • G:\Nouveau Dossier.exe
  • D:\Nouveau Dossier.exe
  • F:\Autorun.inf
  • E:\stuxPC.exe
  • %System Root%\Autorun.inf
  • G:\Autorun.inf
  • %System Root%\stuxPC.exe
  • %User Startup%\svchost.exe
  • %User Temp%\stuxPC.exe
  • F:\Nouveau Dossier.exe
  • %System Root%\Nouveau Dossier.exe
  • %System Root%\Users\Public\Documents\Nouveau Dossier.exe
  • %Windows%\stuxPC.exe
  • %Application Data%\Nouveau Dossier.exe
  • %User Profile%\Documents\Nouveau Dossier.exe
  • F:\stuxPC.exe
  • %Windows%\SysWOW64\stuxPC.exe
  • %All Users Profile%\Microsoft\Windows\Start Menu\Programs\Startup\svchost.exe

Step 4

Scan your computer with your Trend Micro product to delete files detected as Worm.AutoIt.OTORUN.AE. 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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