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WORM_BIFROSE.FSD

October 09, 2012
 Analysis by: Cris Nowell Pantanilla
 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

Infection Channel:

Via physical/removable drives, Downloaded from P2P shares, Propagates via removable drives, Propagates via peer-to-peer networks

This worm arrives via peer-to-peer (P2P) shares. It arrives via removable drives.

It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.

It connects to Internet Relay Chat (IRC) servers. It runs certain commands that it receives remotely from a malicious user. Doing this puts the affected computer and information found on the computer at greater risk. However, as of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size:

78,889 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

24 Mar 2012

Payload:

Compromises system security

Arrival Details

This worm arrives via peer-to-peer (P2P) shares.

It arrives via removable drives.

Installation

This worm drops the following copies of itself into the affected system:

  • %User Profile%\Application Data\cscss.exe

(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Systemappl = "%User Profile%\Application Data\cscss.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
Systemappl = "cscss.exe"

Propagation

This worm drops copies of itself into the following folders used in peer-to-peer (P2P) networks:

  • kazaa\my shared folder\
  • kazaa lite\my shared folder\
  • kazaa lite k++\my shared folder\
  • icq\shared folder\
  • grokster\my grokster\
  • bearshare\shared\
  • edonkey2000\incoming\
  • emule\incoming\
  • morpheus\my shared folder\
  • limewire\shared\
  • tesla\files\
  • winmx\shared\
  • shareaza downloads\
  • my music\bearshare\
  • limewire\saved\
  • limewire\shared\
  • frostwire\shared\
  • frostwire\saved\
  • my music\imesh\

It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.

The said .INF file contains the following strings:

[autorun]
open=SYSTEM\WINDOWS\autorunme.exe
icon=%SystemRoot%\system32\SHELL32.dll,7
action=Open folder to view files
shell\open=Open
shell\open\command=SYSTEM\WINDOWS\autorunme.exe
shell\open\default=1

Backdoor Routine

This worm connects to any of the following Internet Relay Chat (IRC) servers:

  • vb.{BLOCKED}FIXER.COM

It executes the following command(s) from a remote malicious user:

  • DDOS/Flooding
  • Download/Upload files
  • Update self
  • Create/Terminate Process and Threads
  • Connect to remote sites
  • Join IRC server

However, as of this writing, the said sites are inaccessible.

NOTES:

This worm uses the following file names when dropped in peer-to-peer folders:

  • AOL Hacker 2009.exe
  • Adobe Keygen.exe
  • Adobe Photoshop CS3 Keygen.exe
  • Adobe Photoshop CS4 KeyGen.exe
  • Adobe Photoshop Crack.exe
  • Adobe Photoshop Keygen.exe
  • Avast Antivirus Keygen.exe
  • Avira Antivirus 2010 Keygen.exe
  • Avira Internet Security 2010 Keygen.exe
  • Call Of Duty Modern Warfare 2 working multiplayer patch by team reloaded.exe
  • Cisco VPN Keygen.exe
  • Counter-Strike KeyGen.exe
  • Counter-Strike Source KeyGen.exe
  • DeadSpace KeyGen.exe
  • DivX Pro KeyGen.exe
  • Half-Life 2 WORKS-ON-STEAM.exe
  • Kaspersky 2010 Full Suite Keygen.exe
  • Kaspersky Antivirus Keygen.exe
  • Kaspersky Internet Security Keygen.exe
  • Left4Dead-STEAM-Online-Crack-WORKS-DECEMBER08.exe
  • Limewire Pro Downloader.exe
  • Limewire Speed Patch
  • Magic Video Converter Keygen.exe
  • Microsoft Visual Basic 2008 KeyGen.exe
  • Microsoft Visual Basic 6 KeyGen.exe
  • Microsoft Visual C++ 2008 KeyGen.exe
  • Microsoft Visual C++ 6 KeyGen.exe
  • Microsoft Visual Studio 2008 KeyGen.exe
  • Microsoft Visual Studio 6 KeyGen.exe
  • Movie Maker Keygen.exe
  • Myspace Attack.exe
  • Myspace Bruteforce.exe
  • Myspace Cracker.exe
  • Nod32 Antivirus Keygen.exe
  • Nod32 Internet Security Keygen.exe
  • Norton Anti-Virus 2010 Enterprise Keygen.exe
  • Norton Internet Security 2010 Keygen.exe
  • Partition Magic 8 Full package.exe
  • PhotoShop Keygen.exe
  • Photoshop Crack.exe
  • Project 7 Private 4.8.exe
  • Registry Cleaner Keygen.exe
  • RuneScape 2009 - Newest Exploits.exe
  • RuneScape Cracker.exe
  • RuneScape Gold Exploit.exe
  • Steam Account Stealer.exe
  • Tcpip Patch.exe
  • TuneUp 2010 Keygen.exe
  • Virus Generator.exe
  • Virus Maker.exe
  • WOW Account Cracker.exe
  • Widnows 7 Keygen.exe
  • Windows 2008 Server KeyGen.exe
  • Windows 2009 Server working KeyGen by TeaM Reloaded.exe
  • Windows Vista Keygen
  • Windows XP Keygen
  • Windows XP Media Center Keygen.exe
  • YIM HAcker 2008.exe
  • YIM HAcker 2009.exe

It checks the user name of the system and does not execute when the user name is any of the following:

  • CurrentUser
  • UserName
  • andy
  • currentuser
  • honey
  • nepenthes
  • sandbox
  • user
  • vmware

It may hijack searches from the following sites:

  • FaceBook
  • GameZer
  • Games
  • Google
  • Hotmail
  • Music
  • Yahoo
  • YouTube

  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

Identify and terminate files detected as WORM_BIFROSE.FSD

[ Learn More ]
  1. 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.
  2. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

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
    • Systemappl = "%User Profile%\Application Data\cscss.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • Systemappl = "cscss.exe"

Step 4

Search and delete AUTORUN.INF files created by WORM_BIFROSE.FSD that contain these strings

[ Learn More ]
[autorun]
open=SYSTEM\WINDOWS\autorunme.exe
icon=%SystemRoot%\system32\SHELL32.dll,7
action=Open folder to view files
shell\open=Open
shell\open\command=SYSTEM\WINDOWS\autorunme.exe
shell\open\default=1

Step 5

Scan your computer with your Trend Micro product to delete files detected as WORM_BIFROSE.FSD. 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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