BKDR_PRORAT.BL

 Modified by: Rika Joi Gregorio

 ALIASES:

Backdoor:Win32/Prorat.AH(Microsoft), Backdoor.Win32.Prorat(Ikarus), Win32/Prorat.NAH trojan(Eset)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

This backdoor may be dropped by other malware.

It executes commands from a remote malicious user, effectively compromising the affected system. It connects to a website to send and receive information.

  TECHNICAL DETAILS

File Size:

445,096 bytes

File Type:

DLL, EXE

Memory Resident:

Yes

Initial Samples Received Date:

08 Apr 2013

Arrival Details

This backdoor may be dropped by the following malware:

  • WORM_AUTORUN.RJG

Installation

This backdoor drops the following files:

  • %System%\reginv.dll - already detected as BKDR_PRORAT.BL
  • %System%\winkey.dll - already detected as BKDR_PRORAT.BL

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)

It drops and executes the following files:

  • %Windows%\services.exe

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

It drops the following copies of itself into the affected system:

  • %System%\sservice.exe
  • %System%\fservice.exe

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)

Autostart Technique

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
csrss.exe = "%Windows%\ctfmon.exe"

Other System Modifications

This backdoor adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{random}

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\Run

HKEY_CURRENT_USER\Software\Microsoft\
Windows NT Script Host

HKEY_CURRENT_USER\Software\Microsoft\
Windows NT Script Host\Microsoft DxDiag

HKEY_CURRENT_USER\Software\Microsoft\
Windows NT Script Host\Microsoft DxDiag\WinSettings

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
System

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\DisallowRun

HKEY_CURRENT_USER\Software\Policies\
Microsoft\Windows

HKEY_CURRENT_USER\Software\Policies\
Microsoft\Windows\System

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{random}
StubPath = "%System%\sservice.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\Run
DirectX For Microsoft Windows = "%System%\fservice.exe"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\wscsvc
DependOnGroup = 0

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\wscsvc
Group = {null}

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
System
DisableRegistryTools = 1

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
DisallowRun = 1

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\DisallowRun
1 = "ntbackup.exe"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\DisallowRun
2 = "Regedit.exe"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\DisallowRun
3 = "rstrui.exe"

HKEY_CURRENT_USER\Software\Policies\
Microsoft\Windows\System
DisableCMD = 1

It modifies the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
HideFileExt = 1

(Note: The default value data of the said registry entry is 0.)

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
ShowSuperHidden = 2

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced\Folder\HideFileExt
Type = "By Rover"

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced\Folder\SuperHidden
Type = "By Rover"

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\SystemRestore
DisableSR = 1

(Note: The default value data of the said registry entry is 0.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
Shell = "Explorer.exe %System%\fservice.exe"

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

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\sr
Start = 4

(Note: The default value data of the said registry entry is 0.)

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\sr
ImagePath = "\SystemRoot\system32\DRIVERS\sr.sys"

(Note: The default value data of the said registry entry is system32\DRIVERS\sr.sys.)

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\sr\Parameters
FirstRun = 1

(Note: The default value data of the said registry entry is 0.)

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\srservice
Start = 4

(Note: The default value data of the said registry entry is 2.)

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\wscsvc
Start = 4

(Note: The default value data of the said registry entry is 2.)

Backdoor Routine

This backdoor executes the following commands from a remote malicious user:

  • Format Drives (C:\ and D:\)
  • Start or stop service
  • List directory
  • Shutdown system
  • Open or close CD Drive
  • Perform remote shell
  • Terminates process
  • Download and execute arbitrary files

It connects to the following websites to send and receive information:

  • {BLOCKED}.23.237:80/friendship/email_thank_you.php?folder_id={random digit}¶ms_count=0&nick_name=Pro_Rat&user_email=Pro_Rat@yahoo.com&user_uin=&friend_nickname=&friend_contact={random digit}&friend_nickname2=&friend_contact2=&x={random digit}&y={random digit}

Process Termination

This backdoor terminates the following processes if found running in the affected system's memory:

  • WATCHDOG.EXE
  • WEBSCANX.EXE
  • WEBTRAP.EXE
  • WGFE95.EXE
  • WHOSWATCHINGME.EXE
  • WIMMUN32.EXE
  • WINRECON.EXE
  • WNT.EXE
  • WRADMIN.EXE
  • WRCTRL.EXE
  • WSBGATE.EXE
  • WYVERNWORKSFIREWALL.EXE
  • WrAdmin.EXE
  • WrCtrl.EXE
  • XPF202EN.EXE
  • ZAPRO.EXE
  • ZAPSETUP3001.EXE
  • ZATUTOR.EXE
  • ZAUINST.EXE
  • ZONALM2601.EXE
  • ZONEALARM.EXE
  • _AVPCC.EXE
  • _AVPM.EXE
  • agentw.EXE
  • apvxdwin.EXE
  • avkpop.EXE
  • avkservice.EXE
  • avkwctl9.EXE
  • avpm.EXE
  • blackd.EXE
  • ccApp.EXE
  • ccEvtMgr.EXE
  • ccPxySvc.EXE
  • cleaner.EXE
  • cleaner3.EXE
  • cpd.EXE
  • defalert.EXE
  • defscangui.EXE
  • f-stopw.EXE
  • fameh32.EXE
  • fch32.EXE
  • fih32.EXE
  • fnrb32.EXE
  • fsaa.EXE
  • fsav32.EXE
  • fsgk32.EXE
  • fsm32.EXE
  • fsma32.EXE
  • fsmb32.EXE
  • gbmenu.EXE
  • gbpoll.EXE
  • iamapp.EXE
  • iamserv.EXE
  • lockdown2000.EXE
  • navapsvc.EXE
  • nod32.exe
  • ACKWIN32.EXE
  • ADVXDWIN.EXE
  • AGENTSVR.EXE
  • ALERTSVC.EXE
  • ALOGSERV.EXE
  • AMON9X.EXE
  • ANTI-TROJAN.EXE
  • ANTIVIRUS.EXE
  • ANTS.EXE
  • APIMONITOR.EXE
  • APLICA32.EXE
  • APVXDWIN.EXE
  • ATCON.EXE
  • ATGUARD.EXE
  • ATRO55EN.EXE
  • ATUPDATER.EXE
  • ATWATCH.EXE
  • AUPDATE.EXE
  • AUTODOWN.EXE
  • AUTOUPDATE.EXE
  • AVCONSOL.EXE
  • AVGCC32.EXE
  • AVGCTRL.EXE
  • AVGNT.EXE
  • AVGSERV.EXE
  • AVGSERV9.EXE
  • AVGUARD.EXE
  • AVGW.EXE
  • AVP.EXE
  • AVP32.EXE
  • AVPCC.EXE
  • AVPM.EXE
  • AVSYNMGR.EXE
  • AVWINNT.EXE
  • AVWUPSRV.EXE
  • AVXMONITOR9X.EXE
  • AVXMONITORNT.EXE
  • AVXQUAR.EXE
  • AVXW.EXE
  • AckWin32.EXE
  • AutoTrace.EXE
  • AvgServ.EXE
  • Avgctrl.EXE
  • AvkServ.EXE
  • Avsched32.EXE
  • BD_PROFESSIONAL.EXE
  • BIDEF.EXE
  • BIDSERVER.EXE
  • BIPCP.EXE
  • BIPCPEVALSETUP.EXE
  • BISP.EXE
  • BLACKD.EXE
  • BLACKICE.EXE
  • BOOTWARN.EXE
  • BORG2.EXE
  • BS120.EXE
  • BlackICE.EXE
  • CDP.EXE
  • CFGWIZ.EXE
  • CFIADMIN.EXE
  • CFIAUDIT.EXE
  • CFINET.EXE
  • CFINET32.EXE
  • CLAW95CF.EXE
  • CLEAN.EXE
  • CLEANER.EXE
  • CLEANER3.EXE
  • CLEANPC.EXE
  • CMGRDIAN.EXE
  • CMON016.EXE
  • CONNECTIONMONITOR.EXE
  • CPD.EXE
  • CPF9X206.EXE
  • CPFNT206.EXE
  • CTRL.EXE
  • CV.EXE
  • CWNB181.EXE
  • CWNTDWMO.EXE
  • Claw95.EXE
  • Claw95cf.EXE
  • DEFWATCH.EXE
  • DEPUTY.EXE
  • DOORS.EXE
  • DPF.EXE
  • DPFSETUP.EXE
  • DRWATSON.EXE
  • DRWEB32.EXE
  • DVP95.EXE
  • DVP95_0.EXE
  • EFPEADM.EXE
  • ENT.EXE
  • ESCANH95.EXE
  • ESCANHNT.EXE
  • ESCANV95.EXE
  • ETRUSTCIPE.EXE
  • EVPN.EXE
  • EXANTIVIRUS-CNET.EXE
  • EXPERT.EXE
  • F-AGNT95.EXE
  • F-PROT.EXE
  • F-PROT95.EXE
  • F-STOPW.EXE
  • FAST.EXE
  • FIREWALL.EXE
  • FLOWPROTECTOR.EXE
  • FP-WIN.EXE
  • FP-WIN_TRIAL.EXE
  • FRW.EXE
  • FSAV.EXE
  • FSAV530STBYB.EXE
  • FSAV530WTBYB.EXE
  • FSAV95.EXE
  • GBMENU.EXE
  • GBPOLL.EXE
  • GENERICS.EXE
  • GUARD.EXE
  • GUARDDOG.EXE
  • HACKTRACERSETUP.EXE
  • HTLOG.EXE
  • HWPE.EXE
  • IAMAPP.EXE
  • IAMSERV.EXE
  • IAMSTATS.EXE
  • ICLOAD95.EXE
  • ICLOADNT.EXE
  • ICMON.EXE
  • ICSUPP95.EXE
  • ICSUPPNT.EXE
  • IFACE.EXE
  • IFW2000.EXE
  • IOMON98.EXE
  • IPARMOR.EXE
  • IRIS.EXE
  • ISRV95.EXE
  • JAMMER.EXE
  • JEDI.EXE
  • KAVLITE40ENG.EXE
  • KAVPERS40ENG.EXE
  • KAVPF.EXE
  • KERIO-PF-213-EN-WIN.EXE
  • KERIO-WRL-421-EN-WIN.EXE
  • KERIO-WRP-421-EN-WIN.EXE
  • KILLPROCESSSETUP161.EXE
  • LDNETMON.EXE
  • LDPRO.EXE
  • LDPROMENU.EXE
  • LDSCAN.EXE
  • LOCALNET.EXE
  • LOCKDOWN.EXE
  • LOCKDOWN2000.EXE
  • LSETUP.EXE
  • LUALL.EXE
  • LUAU.EXE
  • LUCOMSERVER.EXE
  • LUINIT.EXE
  • LUSPT.EXE
  • MCAGENT.EXE
  • MCMNHDLR.EXE
  • MCTOOL.EXE
  • MCUPDATE.EXE
  • MCVSRTE.EXE
  • MCVSSHLD.EXE
  • MFW2EN.EXE
  • MFWENG3.02D30.EXE
  • MGAVRTCL.EXE
  • MGAVRTE.EXE
  • MGHTML.EXE
  • MGUI.EXE
  • MINILOG.EXE
  • MONITOR.EXE
  • MOOLIVE.EXE
  • MPFAGENT.EXE
  • MPFSERVICE.EXE
  • MPFTRAY.EXE
  • MRFLUX.EXE
  • MSCONFIG.EXE
  • MSINFO32.EXE
  • MSSMMC32.EXE
  • MU0311AD.EXE
  • MWATCH.EXE
  • Mcshield.EXE
  • Monitor.EXE
  • NAV80TRY.EXE
  • NAVAPSVC.EXE
  • NAVAPW32.EXE
  • NAVDX.EXE
  • NAVLU32.EXE
  • NAVSTUB.EXE
  • NAVW32.EXE
  • NAVWNT.EXE
  • NC2000.EXE
  • NCINST4.EXE
  • NDD32.EXE
  • NEOMONITOR.EXE
  • NETARMOR.EXE
  • NETINFO.EXE
  • NETMON.EXE
  • NETSCANPRO.EXE
  • NETSPYHUNTER-1.2.EXE
  • NETSTAT.EXE
  • NETUTILS.EXE
  • NISSERV.EXE
  • NISUM.EXE
  • NMAIN.EXE
  • NORMIST.EXE
  • NORTON_INTERNET_SECU_3.0_407.EXE
  • NPF40_TW_98_NT_ME_2K.EXE
  • NPFMESSENGER.EXE
  • NPROTECT.EXE
  • NPSSVC.EXE
  • NSCHED32.EXE
  • NTVDM.EXE
  • NTXconfig.EXE
  • NVARCH16.EXE
  • NVC95.EXE
  • NWINST4.EXE
  • NWService.EXE
  • NWTOOL16.EXE
  • Navw32.EXE
  • NeoWatchLog.EXE
  • Nui.EXE
  • Nupgrade.EXE
  • OSTRONET.EXE
  • OUTPOST.EXE
  • OUTPOSTINSTALL.EXE
  • OUTPOSTPROINSTALL.EXE
  • PADMIN.EXE
  • PANIXK.EXE
  • PAVPROXY.EXE
  • PCC2002S902.EXE
  • PCC2K_76_1436.EXE
  • PCCIOMON.EXE
  • PCCWIN98.EXE
  • PCDSETUP.EXE
  • PCFWALLICON.EXE
  • PCIP10117_0.EXE
  • PDSETUP.EXE
  • PERISCOPE.EXE
  • PERSFW.EXE
  • PERSWF.EXE
  • PF2.EXE
  • PFWADMIN.EXE
  • PINGSCAN.EXE
  • PLATIN.EXE
  • POP3TRAP.EXE
  • POPROXY.EXE
  • POPSCAN.EXE
  • PORTDETECTIVE.EXE
  • PORTMONITOR.EXE
  • PPINUPDT.EXE
  • PPTBC.EXE
  • PPVSTOP.EXE
  • PROCESSMONITOR.EXE
  • PROCEXPLORERV1.0.EXE
  • PROGRAMAUDITOR.EXE
  • PROPORT.EXE
  • PROTECTX.EXE
  • PSPF.EXE
  • PURGE.EXE
  • PVIEW95.EXE
  • Process
  • QCONSOLE.EXE
  • QSERVER.EXE
  • RAV7.EXE
  • RAV7WIN.EXE
  • RAV8WIN32ENG.EXE
  • REALMON.EXE
  • REGEDIT.EXE
  • REGEDT32.EXE
  • RESCUE.EXE
  • RESCUE32.EXE
  • RRGUARD.EXE
  • RSHELL.EXE
  • RTVSCN95.EXE
  • RULAUNCH.EXE
  • SAFEWEB.EXE
  • SBSERV.EXE
  • SCAN32.EXE
  • SCRSCAN.EXE
  • SD.EXE
  • SETUPVAMEEVAL.EXE
  • SETUP_FLOWPROTECTOR_US.EXE
  • SFC.EXE
  • SGSSFW32.EXE
  • SH.EXE
  • SHELLSPYINSTALL.EXE
  • SHN.EXE
  • SMC.EXE
  • SOFI.EXE
  • SPF.EXE
  • SPHINX.EXE
  • SPYXX.EXE
  • SS3EDIT.EXE
  • ST2.EXE
  • SUPFTRL.EXE
  • SUPPORTER5.EXE
  • SWEEP95.EXE
  • SWEEPSRV.SYS
  • SWNETSUP.EXE
  • SYMPROXYSVC.EXE
  • SYMTRAY.EXE
  • SYSEDIT.EXE
  • Sphinx.EXE
  • SweepNet
  • SymProxySvc.EXE
  • TASKMON.EXE
  • TAUMON.EXE
  • TC.EXE
  • TCA.EXE
  • TCM.EXE
  • TDS-3.EXE
  • TDS2-98.EXE
  • TDS2-NT.EXE
  • TFAK.EXE
  • TFAK5.EXE
  • TGBOB.EXE
  • TITANIN.EXE
  • TITANINXP.EXE
  • TRACERT.EXE
  • TRJSCAN.EXE
  • TRJSETUP.EXE
  • TROJANTRAP3.EXE
  • UNDOBOOT.EXE
  • UPDATE.EXE
  • VBCMSERV.EXE
  • VBCONS.EXE
  • VBUST.EXE
  • VBWIN9X.EXE
  • VBWINNTW.EXE
  • VCSETUP.EXE
  • VET32.EXE
  • VET95.EXE
  • nod32krn.exe
  • nod32kui.exe
  • notstart.EXE
  • npscheck.EXE
  • ntrtscan.EXE
  • nvsvc32.EXE
  • pavproxy.EXE
  • pccntmon.EXE
  • pccwin97.EXE
  • pcscan.EXE
  • rapapp.EXE
  • rtvscan.EXE
  • sbserv.EXE
  • vbcmserv.EXE
  • vshwin32.EXE
  • vsmon.EXE
  • zapro.EXE
  • zonealarm.EXE
  • VETTRAY.EXE
  • VFSETUP.EXE
  • VIR-HELP.EXE
  • VIRUSMDPERSONALFIREWALL.EXE
  • VNLAN300.EXE
  • VNPC3000.EXE
  • VPC32.EXE
  • VPC42.EXE
  • VPFW30S.EXE
  • VPTRAY.EXE
  • VSCENU6.02D30.EXE
  • VSCHED.EXE
  • VSECOMR.EXE
  • VSISETUP.EXE
  • VSMAIN.EXE
  • VSMON.EXE
  • VSSTAT.EXE
  • VSWIN9XE.EXE
  • VSWINNTSE.EXE
  • VSWINPERSE.EXE
  • VbCons.EXE
  • Vet95.EXE
  • VetTray.EXE
  • W32DSM89.EXE
  • W9X.EXE

It terminates processes or services that contain any of the following strings if found running in the affected system's memory:

  • McVSEscn
  • _avp
  • ackwin32
  • anti-trojan
  • aplica32
  • apvxdwin
  • autodown
  • avconsol
  • ave32
  • avgcc32
  • avgctrl
  • avgw
  • avkserv
  • avnt
  • avp
  • avsched32
  • avwin95
  • avwupd32
  • blackd
  • blackice
  • bootwarn
  • ccapp
  • ccshtdwn
  • cfiadmin
  • cfiaudit
  • cfind
  • cfinet
  • claw95
  • ecengine
  • efinet32
  • espwatch
  • f-agnt95
  • f-prot
  • f-prot95
  • f-stopw
  • findviru
  • fp-win
  • fprot
  • fprot95
  • frw
  • gibe
  • iamapp
  • iamserv
  • ibmasn
  • ibmavsp
  • icload95
  • icloadnt
  • icmon
  • icmoon
  • icssuppnt
  • icsupp
  • iface
  • iomon98
  • jedi
  • kpfw32
  • lockdown2000
  • lookout
  • luall
  • mcvsftsn
  • mcvsrte
  • mcvsshld
  • moolive
  • mpftray
  • msconfig
  • nai_vs_stat
  • navapw32
  • navlu32
  • navnt
  • navsched
  • navw
  • nisum
  • nmain
  • normist
  • nupdate
  • nupgrade
  • nvc95
  • outpost
  • padmin
  • pavcl
  • pavsched
  • pavw
  • pcciomon
  • pccmain
  • pccwin98
  • pcfwallicon
  • persfw
  • pop3trap
  • pview
  • rav
  • regedit
  • rescue
  • safeweb
  • serv95
  • sphinx
  • sweep
  • tca
  • tds2
  • vcleaner
  • vcontrol
  • vet32
  • vet95
  • vet98
  • vettray
  • vscan
  • vsecomr
  • vshwin32
  • vsstat
  • webtrap
  • wfindv32
  • zapro
  • zonealarm

Stolen Information

This backdoor sends the data it gathers to the following email addresses via SMTP:

  • {BLOCKED}at@yahoo.com

  SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

8.776.04

FIRST VSAPI PATTERN DATE:

15 Feb 2012

VSAPI OPR PATTERN File:

8.777.00

VSAPI OPR PATTERN Date:

15 Feb 2012

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

Remove the malware/grayware file that dropped/downloaded BKDR_PRORAT.BL

     
    • WORM_AUTORUN.RJG

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Delete this registry key

[ 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.

  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\{random}
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer
  • HKEY_CURRENT_USER\Software\Microsoft\Windows NT Script Host\Microsoft DxDiag\WinSettings
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\DisallowRun
  • HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows

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\SYSTEM\CurrentControlSet\Services\wscsvc
    • DependOnGroup = 0
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\wscsvc
    • Group = {null}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • csrss.exe = "%Windows%\ctfmon.exe"

Step 6

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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
    • From: HideFileExt = 1
      To: HideFileExt = 0
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
    • From: ShowSuperHidden = 2
      To: ShowSuperHidden = 1
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folder\HideFileExt
    • From: Type = "By Rover"
      To: Type = checkbox
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folder\SuperHidden
    • From: Type = "By Rover"
      To: Type = checkbox
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SystemRestore
    • From: DisableSR = 1
      To: DisableSR = 0
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
    • From: Shell = "Explorer.exe %System%\fservice.exe"
      To: Shell = Explorer.exe
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\sr
    • From: Start = 4
      To: Start = 0
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\sr
    • From: ImagePath = "\SystemRoot\system32\DRIVERS\sr.sys"
      To: ImagePath = system32\DRIVERS\sr.sys
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\sr\Parameters
    • From: FirstRun = 1
      To: FirstRun = 0
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\srservice
    • From: Start = 4
      To: Start = 2
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\wscsvc
    • From: Start = 4
      To: Start = 2

Step 7

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