ALIASES:

Virus:Win32/Viking.JB (Microsoft); W32/Fujacks.gen (McAfee); W32.Fujacks.B (Symantec); Backdoor.Win32.Delf.aut (Kaspersky); Win32.Fujacks.Gen (v) (Sunbelt); GenPack:Generic.Malware.SPBdldPkg.81CC1B93 (FSecure)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 OVERALL RISK RATING:
 REPORTED INFECTION:

  • Threat Type: File infector

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

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

It deletes itself after execution.

  TECHNICAL DETAILS

File Size: 436,405 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 26 Apr 2012

Arrival Details

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

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
svcshare = "%System%\drivers\spoclsv.exe"

Other System Modifications

This file infector modifies the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced\Folder\Hidden\
SHOWALL
CheckedValue = "0"

(Note: The default value data of the said registry entry is 1.)

Dropping Routine

This file infector drops the following files:

  • MSagent.exe.exe
  • %System%\drivers\spoclsv.exe
  • %System Root%\autorun.inf
  • %System Root%\setup.exe
  • %Desktop%\vcredist_x86.exe
  • %Desktop%\WinPcap_4_1_2.exe

(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %Desktop% is the current user's desktop, which is usually C:\Windows\Profiles\{user name}\Desktop on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Desktop on Windows NT, and C:\Documents and Settings\{User Name}\Desktop on Windows 2000, XP, and Server 2003.)

Other Details

This file infector connects to the following possibly malicious URL:

  • http://www.{BLOCKED}m.com
  • http://www.{BLOCKED}3.com
  • http://www.{BLOCKED}u.com
  • http://www.{BLOCKED}o.com
  • http://www.{BLOCKED}e.com
  • http://www.{BLOCKED}f.org/all/all.txt

It deletes itself after execution.

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine: 9.200

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Restart in Safe Mode

[ Learn More ]

Step 3

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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • svcshare = "%System%\drivers\spoclsv.exe"

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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folder\Hidden\SHOWALL
    • From: CheckedValue = "0"
      To: CheckedValue = ""1""

Step 5

Search and delete these files

[ Learn More ]
There may be some component 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.
  • MSagent.exe.exe
  • %System%\drivers\spoclsv.exe
  • %System Root%\autorun.inf
  • %System Root%\setup.exe
  • %Desktop%\vcredist_x86.exe
  • %Desktop%\WinPcap_4_1_2.exe

Step 6

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