WORM_SDBOT.SPB

 Analysis by: Sabrina Lei Sioting

 ALIASES:

Trojan:Win32/Qhost.gen!D (Microsoft), W32.IRCBot.Gen (Symantec), Generic QHosts.a.gen (McAfee), Mal/NafBot-A (Sophos), Trojan.Win32.Ircbot!cobra (Sunbelt), W32/Antavmu.FC!tr (Fortinet); W32/Bloop.A.gen!Eldorado (Fprot), Worm.Win32.Pushbot (Ikarus), Win32/Boberog.BG worm (Nod32), Trojan W32/Rbot.BOA (Norman),

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

This worm arrives by connecting affected removable drives to a system. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

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

It modifies the affected system's HOSTS files. This prevents users from accessing certain websites.

  TECHNICAL DETAILS

File Size:

81,920 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

24 Jan 2012

Arrival Details

This worm arrives by connecting affected removable drives to a system.

It may arrive via network shares.

It 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%\test.exe

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

It terminates the execution of the copy it initially executed and executes the copy it drops instead.

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
test = "test.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Terminal Server\
Install\Software\Microsoft\
Windows\CurrentVersion\Run
test = "test.exe"

Other System Modifications

This worm creates the following registry entry(ies) to bypass Windows Firewall:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
{malware path}\{malware name}.exe = "{malware path}\{malware name}.exe:*:Enabled:1"

Propagation

This worm creates the following folders in all removable drives:

  • driver
  • driver\usb

It drops the following copy(ies) of itself in all removable drives:

  • driver\usb\{random characters}

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=driver\usb\{random characters}
action=Open
shell\open=Open
shell\open\command=driver\usb\{random characters}
Usb_Driver installed

Backdoor Routine

This worm connects to any of the following IRC server(s):

  • irc.{BLOCKED}ini.net

HOSTS File Modification

This worm modifies the affected system's HOSTS files to prevent a user from accessing the following websites:

  • www.symantec.com
  • securityresponse.symantec.com
  • symantec.com
  • www.sophos.com
  • sophos.com
  • www.mcafee.com
  • mcafee.com
  • liveupdate.symantecliveupdate.com
  • www.viruslist.com
  • viruslist.com
  • viruslist.com
  • f-secure.com
  • www.f-secure.com
  • kaspersky.com
  • kaspersky-labs.com
  • www.avp.com
  • www.kaspersky.com
  • avp.com
  • www.networkassociates.com
  • networkassociates.com
  • www.ca.com
  • ca.com
  • mast.mcafee.com
  • my-etrust.com
  • www.my-etrust.com
  • download.mcafee.com
  • dispatch.mcafee.com
  • secure.nai.com
  • nai.com
  • www.nai.com
  • update.symantec.com
  • updates.symantec.com
  • us.mcafee.com
  • liveupdate.symantec.com
  • customer.symantec.com
  • rads.mcafee.com
  • trendmicro.com
  • www.trendmicro.com
  • www.grisoft.com
  • www.grisoft.com
  • virustotal.com
  • www.virustotal.com
  • virscan.org
  • www.virscan.org
  • scanner.novirusthanks.org
  • www.scanner.novirusthanks.org
  • virusscan.jotti.org
  • www.virusscan.jotti.org
  • threatexpert.com

NOTES:

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

  • %Program Files%\kazaa\my shared folder\
  • %Program Files%\kazaa lite\my shared folder\
  • %Program Files%\kazaa lite k++\my shared folder\
  • %Program Files%\icq\shared folder\
  • %Program Files%\grokster\my grokster\
  • %Program Files%\bearshare\shared\
  • %Program Files%\edonkey2000\incoming\
  • %Program Files%\emule\incoming\
  • %Program Files%\morpheus\my shared folder\
  • %Program Files%\limewire\shared\
  • %Program Files%\tesla\files\
  • %Program Files%\winmx\shared\

It uses the following file names for the copies it drops in the folders mentioned above:

  • Autoloader.exe
  • DDOSPING.exe
  • Ebooks.exe
  • FREEPORN.exe
  • fuckshitcunt.scr
  • headjobs.scr
  • HotmailHacker.exe
  • How-to-make-money.exe
  • ilovetofuck.scr
  • image.scr
  • LimeWireCrack.exe
  • MSNHacks.exe
  • paris-hilton.scr
  • Porno.MPEG.exe
  • porno.scr
  • RapidsharePREMIUM.exe
  • ScreenMelter.exe
  • VistaUltimate-Crack.exe
  • WildHorneyTeens.scr
  • Wireshark.exe
  • YahooCracker.exe

  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

Terminate a malware/grayware process

[ Learn More ]

*Note: If the detected process is not displayed in theWindows Task Manager, continue doing the next steps.

     test.exe

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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • test = "test.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Terminal Server\Install\Software\Microsoft\Windows\CurrentVersion\Run
    • test = "test.exe"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
    • {malware path}\{malware name}.exe = "{malware path}\{malware name}.exe:*:Enabled:1"

Step 4

Search and delete these folders

[ 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. {drive letter}\driver

Step 5

Remove these strings added by the malware/grayware/spyware in the HOSTS file

[ Learn More ]
    127.0.0.1 www.symantec.com
    127.0.0.1 securityresponse.symantec.com
    127.0.0.1 symantec.com
    127.0.0.1 www.sophos.com
    127.0.0.1 sophos.com
    127.0.0.1 www.mcafee.com
    127.0.0.1 mcafee.com
    127.0.0.1 liveupdate.symantecliveupdate.com
    127.0.0.1 www.viruslist.com
    127.0.0.1 viruslist.com
    127.0.0.1 viruslist.com
    127.0.0.1 f-secure.com
    127.0.0.1 www.f-secure.com
    127.0.0.1 kaspersky.com
    127.0.0.1 kaspersky-labs.com
    127.0.0.1 www.avp.com
    127.0.0.1 www.kaspersky.com
    127.0.0.1 avp.com
    127.0.0.1 www.networkassociates.com
    127.0.0.1 networkassociates.com
    127.0.0.1 www.ca.com
    127.0.0.1 ca.com
    127.0.0.1 mast.mcafee.com
    127.0.0.1 my-etrust.com
    127.0.0.1 www.my-etrust.com
    127.0.0.1 download.mcafee.com
    127.0.0.1 dispatch.mcafee.com
    127.0.0.1 secure.nai.com
    127.0.0.1 nai.com
    127.0.0.1 www.nai.com
    127.0.0.1 update.symantec.com
    127.0.0.1 updates.symantec.com
    127.0.0.1 us.mcafee.com
    127.0.0.1 liveupdate.symantec.com
    127.0.0.1 customer.symantec.com
    127.0.0.1 rads.mcafee.com
    127.0.0.1 trendmicro.com
    127.0.0.1 www.trendmicro.com
    127.0.0.1 www.grisoft.com
    127.0.0.1 www.grisoft.com
    127.0.0.1 virustotal.com
    127.0.0.1 www.virustotal.com
    127.0.0.1 virscan.org
    127.0.0.1 www.virscan.org
    127.0.0.1 scanner.novirusthanks.org
    127.0.0.1 www.scanner.novirusthanks.org
    127.0.0.1 virusscan.jotti.org
    127.0.0.1 www.virusscan.jotti.org
    127.0.0.1 threatexpert.com
"

Step 6

Search and delete AUTORUN.INF files created by WORM_SDBOT.SPB that contain these strings

[ Learn More ]
[autorun]
open=driver\usb\{random characters}
action=Open
shell\open=Open
shell\open\command=driver\usb\{random characters}
Usb_Driver installed

Step 7

Scan your computer with your Trend Micro product to delete files detected as WORM_SDBOT.SPB. 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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