BKDR_OPTIX.12B

Malware type: Backdoor

Aliases: BackDoor-ACH (McAfee), Backdoor.OptixPro.13 (Symantec), BDS/Optix.Pro.12 (Avira), Troj/Bdoor-ACH (Sophos), Backdoor:Win32/Optixpro.S (Microsoft)

In the wild: Yes

Destructive: No

Language: English

Platform: Windows 98, ME, 2000, XP, Server 2003

Encrypted: No

Overall risk rating:

Reported infections:

Damage potential:

High

Distribution potential:

Low

Description: 

This memory-resident backdoor may arrive on an affected system as a dropped file of another malware. It may also be downloaded by another malware from the Internet.

It drops a copy of itself and another executable file, which Trend Micro detects as BKDR_OPTIXPRO.12, upon execution.

This backdoor connects to random port to perform several malicious commands on accessed systems initiated by the user. It also terminates running processes related to antivirus and security companies.

For additional information about this threat, see:

Description created: Apr. 4, 2006 11:41:38 PM GMT -0800


TECHNICAL DETAILS


File type: PE

Memory resident:  Yes

Size of malware: Varies

Ports used: Random

Initial samples received on: Feb 22, 2004

Payload 1: Terminates processes

Payload 2: Drops files

Details:

Installation and Autostart Techniques

This backdoor may arrive on an affected system as a dropped file of another malware. It may also be downloaded by another malware from the Internet.

Upon execution, it drops a copy of itself as any of the following files:

  • %System%\kernel32.exe
  • %System%\regsrv.exe

(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows 2000, or C:\Windows\System32 on Windows XP and Server 2003.)

It also drops WINAMPW.EXE, which Trend Micro detects as BKDR_OPTIXPRO.12, into the Windows folder.

To ensure its automatic execution at every system startup, this backdoor creates the following registry entries, depending on the dropped file:

For KERNEL32.EXE:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\
CurrentVersion\Run
InternalSystray = "%System%\kernel32.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\
CurrentVersion\RunServices
InternalSystray = "%System%\kernel32.exe"

For REGSRV.EXE:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\
CurrentVersion\Run
System Profile = "%System%\regsrv.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\
CurrentVersion\RunServices
System Profile = "%System%\regsrv.exe"

It also modifies the following entry as part of its autostart technique:

HKEY_CLASSES_ROOT\exefile\shell\open\command
@ = "winampw.exe "%1" %*"

(Note: The default value for this entry is @ = ""%1" %*".)

Backdoor Routine

This backdoor connects to random ports to perform the following malicious commands on accessed systems initiated by the user:

  • Close opened windows
  • Delete and rename files
  • Disable keyboard or mouse
  • Display message box
  • Download, upload, and execute files
  • Launch an FTP server
  • List and terminate running processes
  • Log off user
  • Log user keystrokes
  • Maximize and minimize windows
  • Modify window title
  • Open chat window
  • Open or close CD-ROM drive
  • Redirect ports
  • Restart, suspend, or shut down the system
  • Retrieve screenshot or Webcam video
  • Retrieve system information
  • Scan for open ports
  • Send server information to remote user
  • Show or hide Start button
  • Steal cached AIM and RAS passwords
  • Turn on or turn off the monitor
  • View registry information

Process Termination

This backdoor also terminates the following running processes related to antivirus and security companies:

  • _AVP32.EXE
  • _AVPCC.EXE
  • _AVPM.EXE
  • ACKWIN32.EXE
  • ADVXDWIN.EXE
  • AgentSvr.exe
  • ALERTSVC.EXE
  • ALOGSERV.EXE
  • AMON9X.EXE
  • ANTI-TROJAN.EXE
  • ANTS.EXE
  • apvxdwin.exe
  • ATCON.EXE
  • ATUPDATER.EXE
  • ATWATCH.EXE
  • AUTODOWN.EXE
  • AutoTrace.exe
  • AVCONSOL.EXE
  • AVGCC32.EXE
  • AVGCTRL.EXE
  • Avgctrl.exe
  • AvgServ
  • AVGSERV.EXE
  • AVGSERV9.EXE
  • AVGW.EXE
  • avkpop.exe
  • AVKSERV.EXE
  • avkservice.exe
  • avkwctl9.exe
  • AVP.EXE
  • AVP32.EXE
  • AVPCC.EXE
  • AVPM.EXE
  • Avsched32.exe
  • AVSync Manager
  • AvSynMgr
  • AVSYNMGR.EXE
  • AVWINNT.EXE
  • AVXMONITOR9X.EXE
  • AVXMONITORNT.EXE
  • AVXQUAR.EXE.EXE
  • AVXW.EXE
  • BLACKD.EXE
  • BlackICE
  • BLACKICE.EXE
  • CLAW95.EXE
  • CLAW95CF.EXE
  • CLEANER.EXE
  • CLEANER3.EXE
  • CMGRDIAN.EXE
  • CONNECTIONMONITOR.EX
  • CPD.EXE
  • CPDCLNT.EXE
  • defscangui.exe
  • DEFWATCH.EXE
  • DOORS.EXE
  • DVP95.EXE
  • DVP95_0.EXE
  • EFPEADM.EXE
  • ETRUSTCIPE.EXE
  • EVPN.EXE
  • EXPERT.EXE
  • F-AGNT95.EXE
  • fameh32.exe
  • fch32.exe
  • fih32.exe
  • fnrb32.exe
  • F-PROT.EXE
  • F-PROT95.EXE
  • FP-WIN.EXE
  • FRW.EXE
  • fsaa.exe
  • fsav32.exe
  • fsgk32.exe
  • fsm32.exe
  • fsma32.exe
  • fsmb32.exe
  • F-STOPW.EXE
  • gbmenu.exe
  • gbpoll.exe
  • GENERICS.EXE
  • GUARD.EXE
  • GUARDDOG.EXE
  • IAMAPP.EXE
  • IAMSERV.EXE
  • ICLOAD95.EXE
  • ICLOADNT.EXE
  • ICMON.EXE
  • ICSUPP95.EXE
  • ICSUPPNT.EXE
  • IFACE.EXE
  • IOMON98.EXE
  • ISRV95.EXE
  • JEDI.EXE
  • LDNETMON.EXE
  • LDPROMENU.EXE
  • LDSCAN.EXE
  • LOCKDOWN.EXE
  • LOCKDOWN2000.EXE
  • LUALL.EXE
  • LUCOMSERVER.EXE
  • McAfee Firewall
  • MCAGENT.EXE
  • MCMNHDLR.EXE
  • McShield
  • MCSHIELD.EXE
  • MCTOOL.EXE
  • MCUPDATE.EXE
  • MCVSRTE.EXE
  • MCVSSHLD.EXE
  • MGAVRTCL.EXE
  • MGAVRTE.EXE
  • MGHTML.EXE
  • minilog
  • MINILOG.EXE
  • MONITOR.EXE
  • MOOLIVE.EXE
  • MWATCH.EXE
  • NAV Auto-Protect
  • NAVAP
  • navapsvc
  • NAVAPSVC.EXE
  • NAVAPW32.EXE
  • NAVENG
  • NAVEX15
  • NAVLU32.EXE
  • NAVW32.EXE
  • NAVWNT.EXE
  • NDD32.EXE
  • NeoWatchLog.exe
  • NETUTILS.EXE
  • NISSERV
  • NISSERV.EXE
  • NISUM
  • NISUM.EXE
  • NMAIN.EXE
  • NORMIST.EXE
  • NPROTECT.EXE
  • NPSSVC.EXE
  • NSCHED32.EXE
  • ntrtscan.EXE
  • NTVDM.EXE
  • NTXconfig.exe
  • Nui.EXE
  • NVC95.EXE
  • NVSVC32
  • NWService.exe
  • NWTOOL16.EXE
  • PADMIN.EXE
  • pavproxy.exe
  • PCCIOMON.EXE
  • pccntmon.EXE
  • pccwin97.EXE
  • PCCWIN98.EXE
  • pcscan.EXE
  • PERSFW.EXE
  • POP3TRAP.EXE
  • POPROXY.EXE
  • PORTMONITOR.EXE
  • PROCESSMONITOR.EXE
  • PROGRAMAUDITOR.EXE
  • PVIEW95.EXE
  • RAV7.EXE
  • RAV7WIN.EXE
  • REALMON.EXE
  • RESCUE.EXE
  • RTVSCN95.EXE
  • sbserv.exe
  • SCAN32.EXE
  • SCRSCAN.EXE
  • SMC.EXE
  • SPHINX.EXE
  • SPYXX.EXE
  • SS3EDIT.EXE
  • SWEEP95.EXE
  • SweepNet
  • SWEEPSRV.SYS
  • SWNETSUP.EXE
  • SymProxySvc.exe
  • SYMTRAY.EXE
  • TC.EXE
  • TCA.EXE
  • TCM.EXE
  • TDS-3.EXE
  • TFAK.EXE
  • vbcmserv.exe
  • VbCons.exe
  • VET32.EXE
  • VET95.EXE
  • VETTRAY.EXE
  • VIR-HELP.EXE
  • VPC32.EXE
  • VPTRAY.EXE
  • VSCHED.EXE
  • VSECOMR.EXE
  • VSHWIN32.EXE
  • VSMAIN.EXE
  • vsmon
  • VSMON.EXE
  • VSSTAT.EXE
  • WATCHDOG.EXE
  • WEBSCANX.EXE
  • WEBTRAP.EXE
  • WGFE95.EXE
  • WIMMUN32.EXE
  • WRADMIN.EXE
  • WRCTRL.EXE
  • ZAPRO.EXE
  • ZONEALARM.EXE

Platforms Affected

This backdoor affects systems running on Windows 98, ME, 2000, XP, and Server 2003.

Analysis By: Avelino Rico

Revision History:

First pattern file version: 3.311.00
First pattern file release date: Apr 04, 2006

SOLUTION


Minimum scan engine version needed: 7.500

Pattern file needed: 4.573.00

Pattern release date: Jul 1, 2007


Important note: The "Minimum scan engine" refers to the earliest Trend Micro scan engine version guaranteed to detect this threat. However, Trend Micro strongly recommends that you update to the latest version in order to get comprehensive protection. Download the latest scan engine here.

Solution:

Removing Related Malware

To fully remove all associated malware, perform the clean solution for BKDR_OPTIXPRO.12.

Identifying the Malware Program

To remove this malware, first identify the malware program.

  1. Scan your computer with your Trend Micro antivirus product.
  2. NOTE the path and file name of all files detected as BKDR_OPTIX.12B.

Trend Micro customers need to download the latest virus pattern file before scanning their computer. Other users can use Housecall, the Trend Micro online virus scanner.

Terminating the Malware Program

This procedure terminates the running malware process. You will need the name(s) of the file(s) detected earlier.

If the process you are looking for is not in the list displayed by Task Manager, proceed to the succeeding solution set.

  1. Open Windows Task Manager.
    • On Windows 98 and ME, press
    CTRL%20ALT%20DELETE
    • On Windows 2000, XP, and Server 2003, press
    CTRL%20SHIFT%20ESC, then click the Processes tab.
  2. In the list of running programs*, locate the malware file(s) detected earlier.
  3. Select one of the detected files, then press either the End Task or the End Process button, depending on the version of Windows on your computer.
  4. Do the same for all detected malware files in the list of running processes.
  5. To check if the malware process has been terminated, close Task Manager, and then open it again.
  6. Close Task Manager.

*NOTE: On computers running Windows 98 and ME, Windows Task Manager may not show certain processes. You can use a third party process viewer such as Process Explorer to terminate the malware process.

On computers running all Windows platforms, if the process you are looking for is not in the list displayed by Task Manager or Process Explorer, continue with the next solution procedure, noting additional instructions. If the malware process is in the list displayed by either Task Manager or Process Explorer, but you are unable to terminate it, restart your computer in safe mode.

Editing the Registry

This malware modifies the computer's registry. Users affected by this malware may need to modify or delete specific registry keys or entries. For detailed information regarding registry editing, please refer to the following articles from Microsoft:

  1. HOW TO: Backup, Edit, and Restore the Registry in Windows 95, Windows 98, and Windows ME
  2. HOW TO: Backup, Edit, and Restore the Registry in Windows 2000
  3. HOW TO: Back Up, Edit, and Restore the Registry in Windows XP and Server 2003

Removing Autostart Entries from the Registry

Removing autostart entries from the registry prevents the malware from executing at startup.

If the registry entries below are not found, the malware may not have executed as of detection. If so, proceed to the succeeding solution set.

  1. Open Registry Editor. Click Start>Run, type REGEDIT, then press Enter.
  2. In the left panel, double-click the following:
    HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>
    Windows>CurrentVersion>Run
  3. In the right panel, locate and delete any of the following entries:
    • System Profile = "%System%\regsrv.exe"
    • InternalSystray = "%System%\kernel32.exe"
    (Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows 2000, and C:\Windows\System32 on Windows XP and Server 2003.)
  4. In the left panel, double-click the following:
    HKEY_LOCAL_MACHINE>Software>Microsoft>
    Windows>CurrentVersion>RunServices
  5. In the right panel, locate and delete any of the following entries:
    • System Profile = "%System%\regsrv.exe"
    • InternalSystray = "%System%\kernel32.exe"
  6. Close Registry Editor.

Addressing Registry Shell Spawning

This procedure prevents the malware from executing whenever a user opens files with certain extension names. It should restore the registry to its original settings.

  1. Click Start>Run.
  2. In the Open input box, type:
    command /c copy %Windows%\regedit.exe regedit.com | regedit.com

  3. (Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)
  4. Press Enter.
  5. In the left panel, double-click the following:
    HKEY_CLASSES_ROOT>exefile>shell>open>command
  6. In the right panel, locate the registry entry:
    Default
  7. Check whether its value is the path and file name of the malware file.
  8. If the value is the malware file, right-click Default and select Modify to change its value.
  9. In the Value data input box, delete the existing value and type the default value:
    "%1" %*
  10. Close Registry Editor.
  11. Click Start>Run, then type:
    command /c del regedit.com
  12. Press Enter.

Important Windows ME/XP Cleaning Instructions

Users running Windows ME and XP must disable System Restore to allow full scanning of infected computers.

Users running other Windows versions can proceed with the succeeding solution set(s).

Running Trend Micro Antivirus

If you are currently running in safe mode, please restart your computer normally before performing the following solution.

Scan your computer with Trend Micro antivirus and delete files detected as BKDR_OPTIX.12B. To do this, Trend Micro customers must download the latest virus pattern file and scan their computer. Other Internet users can use HouseCall, the Trend Micro online virus scanner.




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