Analysis by: Jaime Benigno Reyes
 PLATFORM:

Windows

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

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel: Via physical/removable drives, Propagates via peer-to-peer networks

This worm arrives by connecting affected removable drives to a system. It arrives via peer-to-peer (P2P) 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.

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

It executes commands from a remote malicious user, effectively compromising the affected system.

  TECHNICAL DETAILS

File Size: 91,648 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 17 Feb 2015
Payload: Compromises system security, Steals information, Modifies HOSTS file

Arrival Details

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

It arrives via peer-to-peer (P2P) 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 and executes them:

  • %Windows%\winsupdt.exe

(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)

It drops the following non-malicious file:

  • {removable drive letter except A and B}:\driver\usb\Desktop.ini

It adds the following mutexes to ensure that only one of its copies runs at any one time:

  • 4y6t8mUt1l

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
wins = "winsupdt.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Terminal Server\
Install\Software\Microsoft\
Windows\CurrentVersion\Run
wins = "winsupdt.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 and name} = "{malware path and name}:*:Enabled:wins"

Propagation

This worm creates the following folders in all removable drives:

  • {removable drive letter except A and B}:\driver
  • {removable drive letter except A and B}:\driver\usb

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

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

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

  • {removable drive letter except A and B}:\driver\usb\ûÉü+çæèòåæ-ÇîÄ

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\ûÉü+çæèòåæ-ÇîÄ
action=Open
shell\open=Open
shell\open\command=driver\usb\ûÉü+çæèòåæ-ÇîÄ
Usb_Driver installed

It sends copies of itself to target recipients using the following instant-messaging (IM) applications:

  • AIM
  • MSN
  • Triton

Backdoor Routine

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

  • {BLOCKED}.{BLOCKED}.244.154

It executes the following commands from a remote malicious user:

  • create process and threads
  • download and execute arbitrary files
  • perform DDOS attack (SYN flood)
  • update self
  • terminate self

As of this writing, the said servers are currently inaccessible.

HOSTS File Modification

This worm overwrites the system's HOSTS files to prevent users from accessing the following websites:

  • 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

Information Theft

This worm gathers the following data:

  • IP address
  • OS version
  • host name
  • language

Other Details

This worm does the following:

  • terminate itself if filemon, procmon, tcpview or wireshark are found running in the system
  • terminate itself if the username contains the virtual machine-related strings currentuser, honey, sandbox or vmware
  • terminate itself if its path and name is C:\sample.exe
  • bypass the firewall by running the command netsh firewall add allowedprogram {malware name} 1 ENABLE
  • use the following attractive file names when propagating in P2P networks and IM applications:
  • 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

NOTES:

It does not have rootkit capabilities.

It does not exploit any vulnerability.

  SOLUTION

Minimum Scan Engine: 9.700
FIRST VSAPI PATTERN FILE: 11.490.02
FIRST VSAPI PATTERN DATE: 20 Feb 2015
VSAPI OPR PATTERN File: 11.491.00
VSAPI OPR PATTERN Date: 21 Feb 2015

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

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Scan your computer with your Trend Micro product and note files detected as WORM_SDBOT.JBR

Step 4

Restart in Safe Mode

[ Learn More ]

Step 5

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

Step 6

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.
  • {removable drive letter except A and B}:\driver\usb

Step 7

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

[ Learn More ]
  • [autorun]
  • open=driver\usb\ûÉü+çæèòåæ-ÇîÄ
  • action=Open
  • shell\open=Open
  • shell\open\command=driver\usb\ûÉü+çæèòåæ-ÇîÄ
  • Usb_Driver installed

Step 8

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 9

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