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WORM_FEARSO.AD

December 06, 2013
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 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:

86,945 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

06 Dec 2013

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 copies of itself into the affected system:

  • %Windows%\svchost.exe

(Note: %Windows% is the Windows folder, which is usually C:\Windows.)

It creates the following folders:

  • %System Root%\My Downloads

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

Autostart Technique

This worm adds the following registry entries to enable its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
ZONEALARM = "%Windows%\le5rpLYTsyB.exe"

Other System Modifications

This worm adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\LOCKDOWN2000

Dropping Routine

This worm drops the following files:

  • %Windows%\kernel.dll
  • %Windows%\le5rpLYTsyB.exe
  • %System Root%\My Downloads\Duke Nukem Manhattan Project Key Generator.exe
  • %System Root%\My Downloads\Internet and Computer Speed Booster ISO - Full Downloader.exe
  • %System Root%\My Downloads\Quake 3 Arena Crack.exe
  • %System Root%\My Downloads\Elder Scrolls III Morrowind THX Brrbrr Full Downloader.exe
  • %System Root%\My Downloads\Norton AntiVirus 2002 Crack.exe
  • %System Root%\My Downloads\AIM Account Stealer Key Generator.exe
  • %System Root%\My Downloads\ZoneAlarm Firewall Patch.exe
  • %System Root%\My Downloads\Zidane-ScreenInstaler Patch.exe
  • %System Root%\My Downloads\Windows XP Full Downloader.exe
  • %System Root%\My Downloads\MoviezChannelsInstaler ISO - Full Downloader.exe
  • %System Root%\My Downloads\Hacking Tool Collection Patch.exe
  • %System Root%\My Downloads\Soldiers Of Anarchy Crack.exe
  • %System Root%\My Downloads\Strike Fighter Project 1 Key Generator.exe
  • %System Root%\My Downloads\Duke Nukem Manhattan Project ISO - Full Downloader.exe
  • %System Root%\My Downloads\Critical Point Manga game Full Downloader.exe
  • %System Root%\My Downloads\Macromedia Patch.exe
  • %System Root%\My Downloads\Warcraft 3 battle.net ISO - Full Downloader.exe
  • %System Root%\My Downloads\Unreal Tournament 3 Full Downloader.exe
  • %System Root%\My Downloads\F1 Grand Pix 4 Key Generator.exe
  • %System Root%\My Downloads\Age of Sail 2 Full Downloader.exe
  • %System Root%\My Downloads\Grand Prix 4 ISO - Full Downloader.exe
  • %System Root%\My Downloads\Age Of Wonders 2 ISO - Full Downloader.exe
  • %System Root%\My Downloads\GTA3 ISO - Full Downloader.exe
  • %System Root%\My Downloads\Cabelas Ultimate Deer Hunt 2 Key Generator.exe
  • %System Root%\My Downloads\Hard Truck 18 Wheels of Steel Patch.exe
  • %System Root%\My Downloads\Norton Utilities 2002 XP Patch.exe
  • %System Root%\My Downloads\The Neverending Story Part I Patch.exe
  • %System Root%\My Downloads\LordOfTheRingsr Key Generator.exe
  • %System Root%\My Downloads\Borland Delphi 6 Crack.exe
  • %System Root%\My Downloads\Grand Prix 4 Key Generator.exe
  • %System Root%\My Downloads\Windows XP Patch.exe
  • %System Root%\My Downloads\The Neverending Story Part I Full Downloader.exe
  • %System Root%\My Downloads\Unreal Tournament 3 Crack.exe
  • %System Root%\My Downloads\F1 Grand Pix 4 ISO - Full Downloader.exe
  • %System Root%\My Downloads\Grand Theft Auto 3 Crack.exe
  • %System Root%\My Downloads\AikaQuest3Hentai Full Downloader.exe
  • %System Root%\My Downloads\LordOfTheRingsr ISO - Full Downloader.exe
  • %System Root%\My Downloads\Civilization 3 Full Downloader.exe
  • %System Root%\My Downloads\Macromedia Dreamweaver MX Patch.exe
  • %System Root%\My Downloads\Microsoft Office XP (English) ISO - Full Downloader.exe
  • %System Root%\My Downloads\Industry Giant 2 ISO - Full Downloader.exe
  • %System Root%\My Downloads\MSN Password Hacker and Stealer Full Downloader.exe
  • %System Root%\My Downloads\Warcraft 3 Crack.exe
  • %System Root%\My Downloads\Squad Battles Eagles Strike Patch.exe
  • %System Root%\My Downloads\Gearhead Garage Crack.exe
  • %System Root%\My Downloads\Clive Barker’s Undying Patch.exe
  • %System Root%\My Downloads\Black And White Crack.exe
  • %System Root%\My Downloads\AIM Account Stealer Crack.exe
  • %System Root%\My Downloads\Gladiator ISO - Full Downloader.exe
  • %System Root%\My Downloads\Macromedia Crack.exe

(Note: %Windows% is the Windows folder, which is usually C:\Windows.. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.300

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

Restart in Safe Mode

[ Learn More ]

Step 3

Delete this registry key

[ 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
    • LOCKDOWN2000

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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • ZONEALARM = "%Windows%\le5rpLYTsyB.exe"

Step 5

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.
  • %Windows%\kernel.dll
  • %Windows%\le5rpLYTsyB.exe
  • %System Root%\My Downloads\Duke Nukem Manhattan Project Key Generator.exe
  • %System Root%\My Downloads\Internet and Computer Speed Booster ISO - Full Downloader.exe
  • %System Root%\My Downloads\Quake 3 Arena Crack.exe
  • %System Root%\My Downloads\Elder Scrolls III Morrowind THX Brrbrr Full Downloader.exe
  • %System Root%\My Downloads\Norton AntiVirus 2002 Crack.exe
  • %System Root%\My Downloads\AIM Account Stealer Key Generator.exe
  • %System Root%\My Downloads\ZoneAlarm Firewall Patch.exe
  • %System Root%\My Downloads\Zidane-ScreenInstaler Patch.exe
  • %System Root%\My Downloads\Windows XP Full Downloader.exe
  • %System Root%\My Downloads\MoviezChannelsInstaler ISO - Full Downloader.exe
  • %System Root%\My Downloads\Hacking Tool Collection Patch.exe
  • %System Root%\My Downloads\Soldiers Of Anarchy Crack.exe
  • %System Root%\My Downloads\Strike Fighter Project 1 Key Generator.exe
  • %System Root%\My Downloads\Duke Nukem Manhattan Project ISO - Full Downloader.exe
  • %System Root%\My Downloads\Critical Point Manga game Full Downloader.exe
  • %System Root%\My Downloads\Macromedia Patch.exe
  • %System Root%\My Downloads\Warcraft 3 battle.net ISO - Full Downloader.exe
  • %System Root%\My Downloads\Unreal Tournament 3 Full Downloader.exe
  • %System Root%\My Downloads\F1 Grand Pix 4 Key Generator.exe
  • %System Root%\My Downloads\Age of Sail 2 Full Downloader.exe
  • %System Root%\My Downloads\Grand Prix 4 ISO - Full Downloader.exe
  • %System Root%\My Downloads\Age Of Wonders 2 ISO - Full Downloader.exe
  • %System Root%\My Downloads\GTA3 ISO - Full Downloader.exe
  • %System Root%\My Downloads\Cabelas Ultimate Deer Hunt 2 Key Generator.exe
  • %System Root%\My Downloads\Hard Truck 18 Wheels of Steel Patch.exe
  • %System Root%\My Downloads\Norton Utilities 2002 XP Patch.exe
  • %System Root%\My Downloads\The Neverending Story Part I Patch.exe
  • %System Root%\My Downloads\LordOfTheRingsr Key Generator.exe
  • %System Root%\My Downloads\Borland Delphi 6 Crack.exe
  • %System Root%\My Downloads\Grand Prix 4 Key Generator.exe
  • %System Root%\My Downloads\Windows XP Patch.exe
  • %System Root%\My Downloads\The Neverending Story Part I Full Downloader.exe
  • %System Root%\My Downloads\Unreal Tournament 3 Crack.exe
  • %System Root%\My Downloads\F1 Grand Pix 4 ISO - Full Downloader.exe
  • %System Root%\My Downloads\Grand Theft Auto 3 Crack.exe
  • %System Root%\My Downloads\AikaQuest3Hentai Full Downloader.exe
  • %System Root%\My Downloads\LordOfTheRingsr ISO - Full Downloader.exe
  • %System Root%\My Downloads\Civilization 3 Full Downloader.exe
  • %System Root%\My Downloads\Macromedia Dreamweaver MX Patch.exe
  • %System Root%\My Downloads\Microsoft Office XP (English) ISO - Full Downloader.exe
  • %System Root%\My Downloads\Industry Giant 2 ISO - Full Downloader.exe
  • %System Root%\My Downloads\MSN Password Hacker and Stealer Full Downloader.exe
  • %System Root%\My Downloads\Warcraft 3 Crack.exe
  • %System Root%\My Downloads\Squad Battles Eagles Strike Patch.exe
  • %System Root%\My Downloads\Gearhead Garage Crack.exe
  • %System Root%\My Downloads\Clive Barker’s Undying Patch.exe
  • %System Root%\My Downloads\Black And White Crack.exe
  • %System Root%\My Downloads\AIM Account Stealer Crack.exe
  • %System Root%\My Downloads\Gladiator ISO - Full Downloader.exe
  • %System Root%\My Downloads\Macromedia Crack.exe

Step 6

Search and delete this folder

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %System Root%\My Downloads

Step 7

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